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# Citation

Citation_Text:
TI: Models of convergent boundary tectonics; implications for the interpretation of Lithoprobe data.
AU: Ellis-Susan; Beaumont-Christopher
AF: Dalhousie University, Department of Oceanography, Halifax, NS, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 10, Pages 1711-1741. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
DE: Appalachian-Phase; Appalachians-; boundary-conditions; Canada-; Cascadia-subduction-zone; continental-crust; crust-; crustal-thickening; greenstone-belts; Hudsonian-Orogeny; Lithoprobe-; metamorphic-belts; models-; North-America; Opatica-Belt; orogenic-belts; Paleoproterozoic-; Paleozoic-; Permian-; physical-properties; plate-convergence; plate-tectonics; Precambrian-; Proterozoic-; rheology-; subduction-; tectonics-; temperature-; theoretical-models; Torngat-Orogeny; Ungava-; upper-Precambrian
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 1033.
IL: Refs: 74; sects., geol. sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-025931
UD: 200008

Title:
Models of convergent boundary tectonics; implications for the interpretation of Lithoprobe data.

Keywords:
Appalachian-Phase; Appalachians-; boundary-conditions; Canada-; Cascadia-subduction-zone; continental-crust; crust-; crustal-thickening; greenstone-belts; Hudsonian-Orogeny; Lithoprobe-; metamorphic-belts; models-; North-America; Opatica-Belt; orogenic-belts; Paleoproterozoic-; Paleozoic-; Permian-; physical-properties; plate-convergence; plate-tectonics; Precambrian-; Proterozoic-; rheology-; subduction-; tectonics-; temperature-; theoretical-models; Torngat-Orogeny; Ungava-; upper-Precambrian

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 10, Pages 1711-1741. 1999.

Publisher:
National Research Council of Canada. Ottawa, ON, Canada. 1999.


Citation_Text:
TI: Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera; implications for the Paleozoic tectonic evolution of the Yukon-Tanana Terrane.
AU: Creaser-Robert-A; Goodwin-Bell-Jo-Anne-S; Erdmer-Philippe
AF: University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton, AB, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 10, Pages 1697-1709. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
DE: basaltic-composition; Canada-; Canadian-Cordillera; eclogite-; geochemistry-; isotope-ratios; isotopes-; lithogeochemistry-; Lithoprobe-; major-elements; metals-; metamorphic-rocks; middle-Paleozoic; Nd-144-Nd-143; neodymium-; North-America; North-American-Cordillera; Paleozoic-; plate-convergence; plate-tectonics; protoliths-; rare-earths; rifting-; stable-isotopes; subduction-zones; terranes-; trace-elements; upper-Paleozoic; Western-Canada; Yukon-Territory; Yukon-Tanana-Terrane
CC: 02D-Isotope-geochemistry; 05A-Igneous-and-metamorphic-petrology
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 1056.
IL: Refs: 49; illus. incl. 2 tables, geol. sketch map.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-025930
UD: 200008

Title:
Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera; implications for the Paleozoic tectonic evolution of the Yukon-Tanana Terrane.

Keywords:
basaltic-composition; Canada-; Canadian-Cordillera; eclogite-; geochemistry-; isotope-ratios; isotopes-; lithogeochemistry-; Lithoprobe-; major-elements; metals-; metamorphic-rocks; middle-Paleozoic; Nd-144-Nd-143; neodymium-; North-America; North-American-Cordillera; Paleozoic-; plate-convergence; plate-tectonics; protoliths-; rare-earths; rifting-; stable-isotopes; subduction-zones; terranes-; trace-elements; upper-Paleozoic; Western-Canada; Yukon-Territory; Yukon-Tanana-Terrane

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 10, Pages 1697-1709. 1999.


Citation_Text:
TI: Georgia Basin; regional setting and adjacent coast mountains geology, British Columbia.
AU: Monger-J-W-H
BK: In: Current Research; Part F, Frontier Geoscience Program, Cordilleran and offshore basins, British Columbia--Recherches en cours; Partie F, Programme geoscientifique des regions pionnieres, bassins de la Cordillere et extracotiers, Colombie-Britannique.
CA: Canada, Geological Survey,
SO: Paper - Geological Survey of Canada. Pages 95-102. 1990.
PB: Geological Survey of Canada. Ottawa, ON, Canada. 1990.
CP: Canada
PY: 1990
LA: English
DE: absolute-age; amphibolite-facies; basins-; Bonanza-Group; Bowen-Island-Group; British-Columbia; Campanian-; Canada-; Cenozoic-; Cretaceous-; dates-; deformation-; Eocene-; fabric-; facies-; faults-; Fire-Lake-Group; Gambier-Group; geophysical-methods; geophysical-surveys; Georgia-Basin; granites-; greenschist-facies; Holocene-; igneous-rocks; Jurassic-; Lithoprobe-; Maestrichtian-; Mesozoic-; metamorphic-rocks; metamorphism-; Miocene-; movement-; Nanaimo-Group; Neogene-; Paleogene-; plate-tectonics; plutonic-rocks; Quaternary-; reflection-methods; Santonian-; seismic-methods; Senonian-; shear-zones; Sickler-Group; subgreenschist-facies; surveys-; tectonics-; Tertiary-; thrust-faults; Twin-Island-Group; U-Pb; Upper-Cretaceous; volcanic-rocks; Western-Canada
CC: 13-Areal-geology
DT: Serial; Report
BL: Analytic
MC: LAT: N490000; N500000; LONG: W1220000; W1240000.
IL: Refs: 37; sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
IS: 0068-7650
IB: 066055660X
CO: CGSPAV
RN: 90-01F
AN: 2000-024910
UD: 200008

Title:
Georgia Basin; regional setting and adjacent coast mountains geology, British Columbia.

Keywords:
absolute-age; amphibolite-facies; basins-; Bonanza-Group; Bowen-Island-Group; British-Columbia; Campanian-; Canada-; Cenozoic-; Cretaceous-; dates-; deformation-; Eocene-; fabric-; facies-; faults-; Fire-Lake-Group; Gambier-Group; geophysical-methods; geophysical-surveys; Georgia-Basin; granites-; greenschist-facies; Holocene-; igneous-rocks; Jurassic-; Lithoprobe-; Maestrichtian-; Mesozoic-; metamorphic-rocks; metamorphism-; Miocene-; movement-; Nanaimo-Group; Neogene-; Paleogene-; plate-tectonics; plutonic-rocks; Quaternary-; reflection-methods; Santonian-; seismic-methods; Senonian-; shear-zones; Sickler-Group; subgreenschist-facies; surveys-; tectonics-; Tertiary-; thrust-faults; Twin-Island-Group; U-Pb; Upper-Cretaceous; volcanic-rocks; Western-Canada

Issue:
Paper - Geological Survey of Canada. Pages 95-102. 1990.

Publisher:
Geological Survey of Canada. Ottawa, ON, Canada. 1990.


Citation_Text:
BK: A portable refraction seismograph PRS1.
BA: Asudeh-I; Anderson-F; Parmelee-J; Vishnubhatla-S; Munro-P; Thomas-J
SO: Open-File Report - Geological Survey of Canada. 1992.
NT: Lithoprobe Contribution
PB: Geological Survey of Canada. Calgary, AB, Canada. Pages: 38. 1992.
CP: Canada
PY: 1992
LA: English
DE: geophysical-methods; instruments-; refraction-methods; seismic-methods; seismographs-; technical-writing; testing-
CC: 19-Seismology
DT: Serial; Report
BL: Monograph
IL: illus.
RF: GeoRef, Copyright 2000, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
CO: #02369
RN: 2478
AN: 2000-021384
UD: 200007

Author:
Asudeh-I; Anderson-F; Parmelee-J; Vishnubhatla-S; Munro-P; Thomas-J

Keywords:
geophysical-methods; instruments-; refraction-methods; seismic-methods; seismographs-; technical-writing; testing-

Issue:
Open-File Report - Geological Survey of Canada. 1992.

Publisher:
Geological Survey of Canada. Calgary, AB, Canada. Pages: 38. 1992.


Citation_Text:
BK: From front to interior; an Ontario transect of the Grenville Province, Sudbury to the St. Lawrence.
BA: Davidson-A; Easton-R-M
BF: Geological Survey of Canada, Ottawa, ON, Canada; Ontario Geological Survey, Canada
SO: Geological Society of America, Annual Meeting, Field Trip Guidebook. 1; 1998.
PB: [publisher varies], United States. Pages: 51. 1998.
CP: United-States
PY: 1998
LA: English
AB: This field trip provides an overview of the southwestern Grenville province in the light of recent metamorphic, geochronologic, and structural studies which, linked to LITHOPROBE seismic reflection surveys, have been the basis for tectonic modeling of this complex Mesoproterozoic orogen. Excellent exposures along the transect afford an opportunity to examine critically the relationships between rocks of different ages in tectonically juxtaposed blocks of crust. From the Grenville front and its immediate, early Paleoproterozoic, Southern province foreland, the trip proceeds up structural section through various slices of high-grade rocks dominated by deformed, early Mesoproterozoic plutons, stacked together during Grenvillian orogeny along ductile shear zones in which remnants of eclogite are locally preserved. It then passes across a major ductile thrust boundary into the Central metasedimentary belt, in which relatively low-grade mid-Mesoproterozoic supracrustal and plutonic rocks are specific to the Grenville orogen, and ends in the core of the orogen where granulite-facies rocks host massifs of anorthosite and related granitoids.
DE: allochthons-; areal-geology; autochthons-; Bancroft-Ontario; Canada-; Canadian-Shield; Central-Metasedimentary-Belt; deformation-; Eastern-Canada; Elzevir-Terrane; faults-; field-trips; Frontenac-Terrane; geophysical-methods; geophysical-surveys; Grenville-Front; Grenville-Province; Grenvillian-Orogeny; guidebook-; Hastings-County-Ontario; Lanark-County-Ontario; Lithoprobe-; Mesoproterozoic-; North-America; Ontario-; orogeny-; Paleoproterozoic-; Parry-Sound-District-Ontario; Parry-Sound-Ontario; Perth-Ontario; Precambrian-; Proterozoic-; reflection-methods; road-log; Saint-Lawrence-River-basin; seismic-methods; shear-zones; Sudbury-District-Ontario; surveys-; upper-Precambrian
CC: 13-Areal-geology
DT: Serial
BL: Monograph
NN: Prep. for Geol. Soc. of Am. annual meeting, Toronto, ON, 1998; includes appendix.
IL: Refs: 175; illus. incl. sect., sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0433-4671
CO: GSAGA8
AN: 2000-020936
UD: 200007

Title:
From front to interior; an Ontario transect of the Grenville Province, Sudbury to the St. Lawrence.

Keywords:
allochthons-; areal-geology; autochthons-; Bancroft-Ontario; Canada-; Canadian-Shield; Central-Metasedimentary-Belt; deformation-; Eastern-Canada; Elzevir-Terrane; faults-; field-trips; Frontenac-Terrane; geophysical-methods; geophysical-surveys; Grenville-Front; Grenville-Province; Grenvillian-Orogeny; guidebook-; Hastings-County-Ontario; Lanark-County-Ontario; Lithoprobe-; Mesoproterozoic-; North-America; Ontario-; orogeny-; Paleoproterozoic-; Parry-Sound-District-Ontario; Parry-Sound-Ontario; Perth-Ontario; Precambrian-; Proterozoic-; reflection-methods; road-log; Saint-Lawrence-River-basin; seismic-methods; shear-zones; Sudbury-District-Ontario; surveys-; upper-Precambrian

Issue:
Geological Society of America, Annual Meeting, Field Trip Guidebook. 1; 1998.

Publisher:
[publisher varies], United States. Pages: 51. 1998.


Citation_Text:
TI: Pattern recognition and tomographic seismic imaging techniques with applications to subsurface tectonic structures of the Canadian Shield.
AU: Mereu-R; Roy-B; Winardhi-S
AF: University of Western Ontario, Department of Earth Sciences, London, ON, Canada
BK: In: 30th international geological congress; abstracts.
BA: Anonymous
SO: International Geological Congress, Abstracts = Congres Geologique International, Resumes. 30, Vol. 3; Pages 112. 1996.
PB: [International Geological Congress]. [location varies], International. 1996.
RP: IGC (International Geological Congress)
CP: International
PY: 1996
CN: 30th international geological congress. Beijing, China. Aug. 4-14, 1996.
LA: English
DE: Abitibi-Belt; Canada-; Canadian-Shield; Central-Metasedimentary-Belt; common-depth-point-method; continental-crust; crust-; geophysical-methods; geophysical-profiles; geophysical-surveys; Grenville-Front; Grenville-Province; imagery-; lateral-heterogeneity; Lithoprobe-; North-America; pattern-recognition; reflection-methods; seismic-methods; seismic-profiles; shields-; Superior-Province; surveys-; tectonic-elements; tectonics-; terranes-; tomography-; velocity-structure
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 2000, American Geological Institute.
CO: IGABBY
AN: 2000-020336
UD: 200007

Title:
Pattern recognition and tomographic seismic imaging techniques with applications to subsurface tectonic structures of the Canadian Shield.

Keywords:
Abitibi-Belt; Canada-; Canadian-Shield; Central-Metasedimentary-Belt; common-depth-point-method; continental-crust; crust-; geophysical-methods; geophysical-profiles; geophysical-surveys; Grenville-Front; Grenville-Province; imagery-; lateral-heterogeneity; Lithoprobe-; North-America; pattern-recognition; reflection-methods; seismic-methods; seismic-profiles; shields-; Superior-Province; surveys-; tectonic-elements; tectonics-; terranes-; tomography-; velocity-structure

Issue:
International Geological Congress, Abstracts = Congres Geologique International, Resumes. 30, Vol. 3; Pages 112. 1996.

Publisher:
[International Geological Congress]. [location varies], International. 1996.


Citation_Text:
TI: Laser (super 40) Ar/ (super 39) Ar thermochronology of Archean rocks in Yellowknife Domain, southwestern Slave Province; insights into the cooling history of an Archean granite-greenstone terrane.
AU: Bethune-Kathryn-M; Villeneuve-Michael-E; Bleeker-Wouter
AF: Queen's University, Department of Geological Sciences, Kingston, ON, Canada
BK: In: NATMAP Slave Province Project--Projet NATMAP de la Province des Esclaves.
BA: Bleeker-Wouter (editor); Davis-William-J (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1189-1206. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: Laser (super 40) Ar/ (super 39) Ar ages for hornblende, muscovite, and biotite from Archean plutonic rocks of Yellowknife Domain, southwestern Slave Province, complement U-Pb ages from minerals with higher closure temperatures (zircon, monazite, titanite). Together, the data indicate that the plutonic suites of different ages (Defeat, Prosperous, Morose) coring three major thermal culminations in the domain have distinct Archean cooling histories until below approximately 250 degrees C (biotite closure). The cooling trajectories for successive suites appear to document a decrease in cooling rate over the course of orogeny, possibly reflecting the build-up of heat within the orogen, coupled with a transition to lower rates of exhumation and (or) erosion. Greater structural relief over the Sleepy Dragon basement culmination may be responsible for slower cooling of the Morose Granite situated in its core. At or below the closure temperature of biotite the cooling curves converge with one another, documenting a transition from "localized" to "regional" cooling. The fact that cooling was locality specific until at least the biotite closure temperature suggests that, just as intrusion and related peak metamorphism were diachronous across the region, so was cooling to approximately 250 degrees C. Uniform regional isotherms thus were not established until >200 Ma after the youngest Archean plutonism. The variable disturbance of biotite Ar spectra, but generally not muscovite or hornblende, indicates that the Paleoproterozoic thermal disturbance of Archean rocks in Yellowknife Domain did not exceed 200-300 degrees C.
DE: absolute-age; amphibole-group; Ar-Ar; Archean-; biotite-; Canada-; Canadian-Shield; chain-silicates; clinoamphibole-; cooling-; cratons-; dates-; emplacement-; hornblende-; intrusions-; Lithoprobe-; Mackenzie-District-Northwest-Territories; metamorphic-rocks; metaplutonic-rocks; mica-group; monazite-; Morose-Granite; muscovite-; NATMAP-; nesosilicates-; North-America; Northwest-Territories; orogeny-; orthosilicates-; phosphates-; plutons-; Precambrian-; sheet-silicates; shields-; silicates-; Slave-Province; Sleepy-Dragon-Complex; tectonics-; thermal-history; thermochronology-; titanite-; U-Pb; Western-Canada; Yellowknife-Domain; zircon-
CC: 16-Structural-geology; 03-Geochronology
DT: Serial
BL: Analytic
MC: LAT: N620000; N630000; LONG: W1120000; W1143000.
NN: Geol. Surv. Can., Contrib. No. 1998062; Lithoprobe Publ. No. 1122.
IL: Refs: 74; illus. incl. 1 table, geol. sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-019783
UD: 200007

Title:
Laser (super 40) Ar/ (super 39) Ar thermochronology of Archean rocks in Yellowknife Domain, southwestern Slave Province; insights into the cooling history of an Archean granite-greenstone terrane.

Keywords:
absolute-age; amphibole-group; Ar-Ar; Archean-; biotite-; Canada-; Canadian-Shield; chain-silicates; clinoamphibole-; cooling-; cratons-; dates-; emplacement-; hornblende-; intrusions-; Lithoprobe-; Mackenzie-District-Northwest-Territories; metamorphic-rocks; metaplutonic-rocks; mica-group; monazite-; Morose-Granite; muscovite-; NATMAP-; nesosilicates-; North-America; Northwest-Territories; orogeny-; orthosilicates-; phosphates-; plutons-; Precambrian-; sheet-silicates; shields-; silicates-; Slave-Province; Sleepy-Dragon-Complex; tectonics-; thermal-history; thermochronology-; titanite-; U-Pb; Western-Canada; Yellowknife-Domain; zircon-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1189-1206. 1999.


Citation_Text:
TI: Timing of plutonism, deformation, and metamorphism in the Yellowknife Domain, Slave Province, Canada.
AU: Davis-William-J; Bleeker-Wouter
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: NATMAP Slave Province Project--Projet NATMAP de la Province des Esclaves.
BA: Bleeker-Wouter (editor); Davis-William-J (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1169-1187. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: U-Pb zircon, titanite, and monazite ages for plutonic rocks are used to constrain the timing of post-2660 Ma deformational and metamorphic events in the Yellowknife Domain, southern Slave Province. Diorite and tonalite plutons of the Defeat Suite yield ages of 2628+ or -3 and 2624+ or -3 Ma, older than previous, less precise estimates for this suite of ca. 2618-2620 Ma. The Defeat Suite plutons crosscut and postdate upright F (sub 1) folds in turbidites of the ca. 2680-2660 Ma Burwash Formation. D (sub 1) deformation is therefore bracketed between 2660 and 2630 Ma. The D (sub 1) event significantly predates deposition of polymict conglomerates of the Jackson Lake Formation. A second folding event (F (sub 2) ), represented by northwest- to north-trending steeply plunging folds of bedding and D (sub 1) structures, affected the area after intrusion of the Hidden Lake pluton at 2606+ or -2 Ma, and synchronously with intrusion of the 2596+ or -2 Ma Sparrow Lake pluton, a member of the two-mica granite Prosperous suite. The time of initiation and the duration of D (sub 2) deformation are not well defined. It may have affected units as young as the 2586+ or -2 Ma Morose Granite. Metamorphic isograds are spatially related to Defeat, Prosperous, or even younger plutonic complexes, and therefore formed at different times over a 30 Ma period in different parts of the Yellowknife Domain. The ca. 2620-2630 Ma Defeat-type plutonism started in the Yellowknife Domain 10-15 Ma earlier than similar intrusive events in the central and northern Slave Province and highlights diachronous development of plutonism in the period from 2630 to 2610 Ma. In contrast, the ages of younger granites in the Yellowknife Domain (Prosperous, Morose) are within the range of intrusive ages documented for similar plutonic suites elsewhere in the Slave Province.
DE: absolute-age; Archean-; Canada-; Canadian-Shield; cratons-; dates-; Defeat-Suite; deformation-; diachronism-; emplacement-; folds-; intrusions-; Lithoprobe-; Mackenzie-District-Northwest-Territories; magmatism-; metamorphic-rocks; metaplutonic-rocks; monazite-; Morose-Granite; NATMAP-; nesosilicates-; North-America; Northwest-Territories; orthosilicates-; phosphates-; plutons-; polyphase-processes; Precambrian-; regression-analysis; shields-; silicates-; Slave-Province; statistical-analysis; tectonics-; titanite-; U-Pb; Western-Canada; Yellowknife-Domain; zircon-
CC: 16-Structural-geology; 03-Geochronology
DT: Serial
BL: Analytic
MC: LAT: N620000; N630000; LONG: W1120000; W1150000.
NN: Geol. Surv. Can., Contrib. No. 1998035; Lithoprobe Publ. No. 1121.
IL: Refs: 69; illus. incl. 2 tables, geol. sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-019782
UD: 200007

Title:
Timing of plutonism, deformation, and metamorphism in the Yellowknife Domain, Slave Province, Canada.

Keywords:
absolute-age; Archean-; Canada-; Canadian-Shield; cratons-; dates-; Defeat-Suite; deformation-; diachronism-; emplacement-; folds-; intrusions-; Lithoprobe-; Mackenzie-District-Northwest-Territories; magmatism-; metamorphic-rocks; metaplutonic-rocks; monazite-; Morose-Granite; NATMAP-; nesosilicates-; North-America; Northwest-Territories; orthosilicates-; phosphates-; plutons-; polyphase-processes; Precambrian-; regression-analysis; shields-; silicates-; Slave-Province; statistical-analysis; tectonics-; titanite-; U-Pb; Western-Canada; Yellowknife-Domain; zircon-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1169-1187. 1999.


Citation_Text:
TI: The Central Slave Basement Complex; Part II, Age and tectonic significance of high-strain zones along the basement-cover contact.
AU: Bleeker-Wouter; Ketchum-John-W-F; Davis-William-J
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
BK: In: NATMAP Slave Province Project--Projet NATMAP de la Province des Esclaves.
BA: Bleeker-Wouter (editor); Davis-William-J (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1111-1130. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The basement-cover high-strain zone enveloping parts of the Sleepy Dragon Complex, northeast of Yellowknife, Slave Province, Canada, has been reinvestigated. Integrated stratigraphic, structural, and geochronological data show that the high-strain zone is of regional extent and is best interpreted as a decollement between crystalline, ca. 2.9-3.3 Ga rocks of the Central Slave Basement Complex and pre-2687 Ma cover rocks. Three temporally distinct mafic dyke swarms occur within the high-strain zone. The two oldest of these constrain the timing of the high-strain event to between 2734+ or -2 and 2687+ or -1 Ma. At the time of decollement development, the cover stratigraphy consisted of (i) the Central Slave Cover Group, a thin, pre-2734 Ma succession of mafic and ultramafic volcanic rocks, conglomerates, fuchsitic quartzites, minor rhyolites, and banded iron formation; and (ii) an overlying sequence of tholeiitic pillow basalts. The Central Slave Cover Group is considered to be autochthonous, whereas a variety of evidence suggests that the pillow basalts are parautochthonous to possibly allochthonous. The transport direction in the decollement was from northeast to southwest, and maximum displacement was probably on the order of 10 to several tens of kilometres. Presently, the decollement appears discontinuous due to younger intrusive and erosional events. Around most of the southern flanks of the Sleepy Dragon Complex, the crystalline core of the complex consists of post-decollement intrusive rocks and (or) is unconformably overlain by parts of the Yellowknife Supergroup that are younger than 2687 Ma. Lineation patterns in these younger rocks reflect regional deformation events that postdate and are unrelated to the decollement. The new data allow two tectonic models for development of the decollement: (i) a contractional thrusting model, involving collision of an eastern Slave Province arc terrane; or (ii) a syn-greenstone belt extensional model.
DE: absolute-age; Archean-; basement-; Canada-; Canadian-Shield; Central-Slave-Basement-Complex; Central-Slave-Cover-Group; continental-crust; contraction-; cratons-; crust-; crystalline-rocks; dates-; decollement-; deformation-; dike-swarms; dikes-; extension-; faults-; greenstone-belts; intrusions-; Lithoprobe-; Mackenzie-District-Northwest-Territories; metamorphic-belts; metamorphic-rocks; mylonites-; NATMAP-; North-America; Northwest-Territories; polyphase-processes; Precambrian-; sedimentary-cover; shields-; Slave-Province; Sleepy-Dragon-Complex; strain-; tectonics-; thrust-faults; topology-; U-Pb; Western-Canada
CC: 16-Structural-geology; 03-Geochronology
DT: Serial
BL: Analytic
NN: Geol. Surv. Can., Contrib. No. 1998029; Lithoprobe Publ. No. 1120.
IL: Refs: 70; illus. incl. 1 table, geol. sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-019779
UD: 200007

Title:
The Central Slave Basement Complex; Part II, Age and tectonic significance of high-strain zones along the basement-cover contact.

Keywords:
absolute-age; Archean-; basement-; Canada-; Canadian-Shield; Central-Slave-Basement-Complex; Central-Slave-Cover-Group; continental-crust; contraction-; cratons-; crust-; crystalline-rocks; dates-; decollement-; deformation-; dike-swarms; dikes-; extension-; faults-; greenstone-belts; intrusions-; Lithoprobe-; Mackenzie-District-Northwest-Territories; metamorphic-belts; metamorphic-rocks; mylonites-; NATMAP-; North-America; Northwest-Territories; polyphase-processes; Precambrian-; sedimentary-cover; shields-; Slave-Province; Sleepy-Dragon-Complex; strain-; tectonics-; thrust-faults; topology-; U-Pb; Western-Canada

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1111-1130. 1999.


Citation_Text:
TI: The Central Slave Basement Complex; Part I, Its structural topology and autochthonous cover.
AU: Bleeker-Wouter; Ketchum-John-W-F; Jackson-Valerie-A; Villeneuve-Michael-E
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
BK: In: NATMAP Slave Province Project--Projet NATMAP de la Province des Esclaves.
BA: Bleeker-Wouter (editor); Davis-William-J (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1083-1109. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: New field and geochronological data are used to define the distribution of Mesoarchean basement rocks in the south-central Slave Province. This distribution reflects a single contiguous basement terrane that we propose to call the Central Slave Basement Complex. It shows a structural topology that is internally consistent and compatible with known regional folding and faulting events. A sample of a proposed basement gneiss below the Courageous Lake greenstone belt, central Slave Province, has been dated by U-Pb methods and yields an age of 3325+ or -8 Ma, consistent with the new basement distribution. This sample also contains 2723+ or -3 Ma metamorphic zircon and ca. 2680 Ma titanite. The Central Slave Basement Complex is overlain by a thin, discontinuous, but distinctive cover sequence that includes minor volcanic rocks, clastic sedimentary rocks, and banded iron formation. All previously known and some new occurrences of this distinctive cover sequence occur in the immediate stratigraphic hanging wall of the Central Slave Basement Complex, locally overlying a preserved in situ unconformity. We propose to call this post-2.93 Ga cover sequence the Central Slave Cover Group. It is perhaps best typified by detrital chromite-bearing, fuchsitic quartzites. Formal formation names are proposed for the spatially separate occurrences of the Central Slave Cover Group. Detrital zircon ages are presented for one of the formations of the Central Slave Cover Group, the Patterson Lake Formation, which occurs on the western flank of a local basement culmination known as the Sleepy Dragon Complex. The detrital zircon data provide evidence for two discrete basement sources dated at ca. 2943 Ma and ca. 3147-3160 Ma. These detrital ages reinforce the depositional link between the Central Slave Cover Group and underlying crystalline rocks of the Central Slave Basement Complex.
DE: absolute-age; Archean-; autochthons-; basement-; Canada-; Canadian-Shield; Central-Slave-Basement-Complex; Central-Slave-Cover-Group; cratons-; dates-; detritus-; faults-; field-studies; folds-; gneisses-; Lithoprobe-; Mackenzie-District-Northwest-Territories; metamorphic-rocks; middle-Archean; NATMAP-; nesosilicates-; new-names; North-America; Northwest-Territories; orthosilicates-; Patterson-Lake-Formation; Precambrian-; shields-; silicates-; Slave-Province; structural-analysis; supracrustals-; tectonic-elements; terranes-; titanite-; topology-; U-Pb; Western-Canada; zircon-
CC: 16-Structural-geology; 03-Geochronology
DT: Serial
BL: Analytic
NN: Includes appendix; Geol. Surv. Can., Contrib. No. 1998030; Lithoprobe Publ. No. 1119.
IL: Refs: 73; illus. incl. sects., strat. cols., 2 tables, geol. sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-019778
UD: 200007

Title:
The Central Slave Basement Complex; Part I, Its structural topology and autochthonous cover.

Keywords:
absolute-age; Archean-; autochthons-; basement-; Canada-; Canadian-Shield; Central-Slave-Basement-Complex; Central-Slave-Cover-Group; cratons-; dates-; detritus-; faults-; field-studies; folds-; gneisses-; Lithoprobe-; Mackenzie-District-Northwest-Territories; metamorphic-rocks; middle-Archean; NATMAP-; nesosilicates-; new-names; North-America; Northwest-Territories; orthosilicates-; Patterson-Lake-Formation; Precambrian-; shields-; silicates-; Slave-Province; structural-analysis; supracrustals-; tectonic-elements; terranes-; titanite-; topology-; U-Pb; Western-Canada; zircon-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1083-1109. 1999.


Citation_Text:
TI: The 1991-1996 NATMAP Slave Province Project; introduction.
AU: Bleeker-Wouter; Davis-William-J
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
BK: In: NATMAP Slave Province Project--Projet NATMAP de la Province des Esclaves.
BA: Bleeker-Wouter (editor); Davis-William-J (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1033-1042. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The 11 papers contributed to this issue on the geology of the Slave Province are summarized, and where appropriate, links between data from the various contributions are emphasized. In the discussion, we provide a synthesis of the present knowledge base on pre-Yellowknife Supergroup basement rocks throughout the Slave Province. All available age data on Mesoarchean and Paleoarchean basement rocks are compiled and, in a first attempt to seek regional correlations, 10 "events" of crustal growth and (or) reworking are recognized, spanning well over 1 billion years of Earth's history. The spatial distributions of these events across the craton are discussed. Finally, we pose a series of important questions that remain and that may help guide future research.
DE: Archean-; basement-; Canada-; Canadian-Shield; continental-crust; cratons-; cross-sections; crust-; Lithoprobe-; Mackenzie-District-Northwest-Territories; middle-Archean; NATMAP-; North-America; Northwest-Territories; Nunavut-; Precambrian-; programs-; shields-; Slave-Province; Western-Canada
CC: 16-Structural-geology; 12-Stratigraphy
DT: Serial
BL: Analytic
NN: Geol. Surv. Can., Contrib. No. 1999020; Lithoprobe Publ. No. 1118.
IL: Refs: 67; illus. incl. sect., geol. sketch map.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-019775
UD: 200007

Title:
The 1991-1996 NATMAP Slave Province Project; introduction.

Keywords:
Archean-; basement-; Canada-; Canadian-Shield; continental-crust; cratons-; cross-sections; crust-; Lithoprobe-; Mackenzie-District-Northwest-Territories; middle-Archean; NATMAP-; North-America; Northwest-Territories; Nunavut-; Precambrian-; programs-; shields-; Slave-Province; Western-Canada

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 7, Pages 1033-1042. 1999.


Citation_Text:
BK: Geological maps of southern Vancouver Island, Lithoprobe.
BA: Sutherland-Brown-A (compiler); Yorath-C-J (compiler); Anderson-R-G (compiler); Dom-K (compiler)
SO: Open-File Report - Geological Survey of Canada. 1986.
PB: Geological Survey of Canada. Calgary, AB, Canada. Pages: 1 sheet. 1986.
CP: Canada
PY: 1986
LA: English
DE: Bonanza-Group; British-Columbia; Canada-; Cenozoic-; geologic-maps; geophysical-methods; geophysical-profiles; geophysical-surveys; Jurassic-; Lithoprobe-; maps-; Mesozoic-; Nanaimo-Group; Paleozoic-; reflection-methods; seismic-methods; seismic-profiles; Sicker-Group; surveys-; upper-Paleozoic; Vancouver-Group; Vancouver-Island; Western-Canada
CC: 14-Geologic-maps
DT: Map; Serial; Report
BL: Monograph
MS: 1:50,000
MP: geologic map
IL: illus.
RF: GeoRef, Copyright 2000, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
CO: #02369
RN: 1272
AN: 2000-015793
UD: 200006

Author:
Sutherland-Brown-A (compiler); Yorath-C-J (compiler); Anderson-R-G (compiler); Dom-K (compiler)

Title:
Geological maps of southern Vancouver Island, Lithoprobe.

Keywords:
Bonanza-Group; British-Columbia; Canada-; Cenozoic-; geologic-maps; geophysical-methods; geophysical-profiles; geophysical-surveys; Jurassic-; Lithoprobe-; maps-; Mesozoic-; Nanaimo-Group; Paleozoic-; reflection-methods; seismic-methods; seismic-profiles; Sicker-Group; surveys-; upper-Paleozoic; Vancouver-Group; Vancouver-Island; Western-Canada

Issue:
Open-File Report - Geological Survey of Canada. 1986.

Publisher:
Geological Survey of Canada. Calgary, AB, Canada. Pages: 1 sheet. 1986.


Citation_Text:
BK: Deep marine multichannel seismic data from the Northeast Newfoundland continental margin; Lithoprobe East.
BA: Keen-C-E; Kay-W
SO: Open-File Report - Geological Survey of Canada. 1986.
PB: Geological Survey of Canada. Calgary, AB, Canada. Pages: 57. 1986.
CP: Canada
PY: 1986
LA: English
LS: French
DE: Atlantic-Ocean; Canada-; continental-margin; Eastern-Canada; geophysical-methods; geophysical-surveys; Lithoprobe-; marine-methods; Mohorovicic-discontinuity; multichannel-methods; Newfoundland-; North-Atlantic; Northwest-Atlantic; reflection-methods; seismic-methods; surveys-
CC: 20-Applied-geophysics
DT: Serial; Report
BL: Monograph
IL: Refs: 4; illus.
RF: GeoRef, Copyright 2000, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
CO: #02369
RN: 1281
AN: 2000-015786
UD: 200006

Title:
Deep marine multichannel seismic data from the Northeast Newfoundland continental margin; Lithoprobe East.

Keywords:
Atlantic-Ocean; Canada-; continental-margin; Eastern-Canada; geophysical-methods; geophysical-surveys; Lithoprobe-; marine-methods; Mohorovicic-discontinuity; multichannel-methods; Newfoundland-; North-Atlantic; Northwest-Atlantic; reflection-methods; seismic-methods; surveys-

Publisher:
Geological Survey of Canada. Calgary, AB, Canada. Pages: 57. 1986.


Citation_Text:
TI: Reflectivity of Archean crust from surface seismic and borehole geophysical studies--Reflectivite de la croute archeenne determinee a partir d'etudes sismiques de surface et de diagraphies de sondages.
AU: Milkereit-B; White-D; Adam-E
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON,
BK: In: Forum 1993; program with abstracts--Forum 1993; programme et resumes.
BA: Anonymous
SO: Current Activities Forum ... Program with Abstracts. 1993; Pages E16, F18. 1993.
PB: Geological Survey of Canada. Ottawa, ON, Canada. 1993.
CP: Canada
PY: 1993
CN: Forum 1993. Ottawa, ON, Canada. Jan. 19-20, 1993.
LA: English; French
DE: Archean-; boreholes-; Canada-; crust-; Eastern-Canada; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; Ontario-; Precambrian-; Quebec-; reflection-methods; seismic-methods; seismic-profiles; seismic-stratigraphy; Sudbury-Structure; surveys-
CC: 12-Stratigraphy; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0836-9577
AN: 2000-014282
UD: 200005

Title:
Reflectivity of Archean crust from surface seismic and borehole geophysical studies--Reflectivite de la croute archeenne determinee a partir d'etudes sismiques de surface et de diagraphies de sondages.

Keywords:
Archean-; boreholes-; Canada-; crust-; Eastern-Canada; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; Ontario-; Precambrian-; Quebec-; reflection-methods; seismic-methods; seismic-profiles; seismic-stratigraphy; Sudbury-Structure; surveys-

Issue:
Current Activities Forum ... Program with Abstracts. 1993; Pages E16, F18. 1993.

Publisher:
Geological Survey of Canada. Ottawa, ON, Canada. 1993.


Citation_Text:
TI: A new perspective of the Trans-Hudson Orogen--L'Orogene Trans-Hudsonien vu d'un autre angle.
AU: White-D; Jones-A-G; Lucas-S-B
AF: Geological Survey of Canada, Geophysics Division, Ottawa, ON,
BK: In: Forum 1993; program with abstracts--Forum 1993; programme et resumes.
BA: Anonymous
SO: Current Activities Forum ... Program with Abstracts. 1993; Pages E5-E6, F6. 1993.
PB: Geological Survey of Canada. Ottawa, ON, Canada. 1993.
CP: Canada
PY: 1993
CN: Forum 1993. Ottawa, ON, Canada. Jan. 19-20, 1993.
LA: English; French
DE: Canadian-Shield; geophysical-methods; geophysical-profiles; Hudsonian-Orogeny; Lithoprobe-; North-America; Paleoproterozoic-; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; reflection-methods; seismic-methods; seismic-profiles; Superior-Province; tectonics-; upper-Precambrian
CC: 16-Structural-geology
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0836-9577
AN: 2000-014239
UD: 200005

Title:
A new perspective of the Trans-Hudson Orogen--L'Orogene Trans-Hudsonien vu d'un autre angle.

Keywords:
Canadian-Shield; geophysical-methods; geophysical-profiles; Hudsonian-Orogeny; Lithoprobe-; North-America; Paleoproterozoic-; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; reflection-methods; seismic-methods; seismic-profiles; Superior-Province; tectonics-; upper-Precambrian

Issue:
Current Activities Forum ... Program with Abstracts. 1993; Pages E5-E6, F6. 1993.


Citation_Text:
TI: Imaging the Moho and V (sub p) / V (sub s) ratio in the western Superior Archean craton with wide-angle reflections.
AU: Kay-I; Musacchio-G; White-D; Asudeh-I; Roberts-B; Forsyth-D; Hajnal-Z; Koperwhats-B; Farrell-D
AF: Geological Survey of Canada, Ottawa, ON, Canada
SO: Geophysical Research Letters. 26; 16, Pages 2585-2588. 1999.
PB: American Geophysical Union. Washington, DC, United States. 1999.
RP: USGSOP (Non-USGS publications with USGS authors)
CP: United-States
PY: 1999
LA: English
DE: Archean-; body-waves; Canada-; Canadian-Shield; continental-crust; crust-; depth-; Eastern-Canada; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; geotraverses-; imagery-; Lithoprobe-; Mohorovicic-discontinuity; North-America; northwestern-Ontario; Ontario-; P-waves; Precambrian-; reflection-methods; refraction-methods; S-waves; seismic-methods; seismic-profiles; seismic-waves; Superior-Province; surveys-; wide-angle-seismic-methods
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
IL: Refs: 14; illus. incl. geol. sketch map, 1 table, sects.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0094-8276
CO: GPRLAJ
AN: 2000-012661
UD: 200005

Author:
Kay-I; Musacchio-G; White-D; Asudeh-I; Roberts-B; Forsyth-D; Hajnal-Z; Koperwhats-B; Farrell-D

Title:
Imaging the Moho and V (sub p) / V (sub s) ratio in the western Superior Archean craton with wide-angle reflections.

Keywords:
Archean-; body-waves; Canada-; Canadian-Shield; continental-crust; crust-; depth-; Eastern-Canada; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; geotraverses-; imagery-; Lithoprobe-; Mohorovicic-discontinuity; North-America; northwestern-Ontario; Ontario-; P-waves; Precambrian-; reflection-methods; refraction-methods; S-waves; seismic-methods; seismic-profiles; seismic-waves; Superior-Province; surveys-; wide-angle-seismic-methods

Issue:
Geophysical Research Letters. 26; 16, Pages 2585-2588. 1999.

Publisher:
American Geophysical Union. Washington, DC, United States. 1999.


Citation_Text:
TI: Paleomagnetic and geobarometric study of the Late Cretaceous Mount Lorne Stock, southern Yukon Territory.
AU: Harris-M-J; Symons-D-T-A; Blackburn-W-H; Hart-C-J-R
AF: University of Western Ontario, Department of Earth Sciences, London, ON, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 6, Pages 905-915. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The approximately 75 Ma Mount Lorne monzodiorite stock has been studied paleomagnetically to estimate the tectonic motion of the northern Canadian Cordillera since the Late Cretaceous. The stock is one of several paleomagnetic studies currently underway at the University of Windsor Paleomagnetic Laboratory which are funded by the Lithoprobe - Slave Northern Cordillera Lithospheric Evolution (SNORCLE) Project. Al-in-hornblende geobarometry and plagioclase-amphibole geothermometry data suggest that the stock has not been tilted since emplacement but does provide evidence that the stock has a normal fault trending north-south through its centre with the east side uplifted relatively by approximately 1000 m. Paleomagnetic measurements from 12 of 19 granitoid sites yield a well-defined characteristic remanent magnetization direction that is south-southwest and up, and a further six sites yield a direction that is north-northeast and down. Data from a mafic dike yield a negative contact test, suggesting that the dike is coeval with the stock. Combining the 18 granitic site mean characteristic remanent magnetization directions yields a paleopole at 69.1 degrees W, 78.3 degrees N (d (sub p) = 4.1 degrees , d (sub m) = 4.5 degrees ) which suggests that the host Stikine Terrane has been translated poleward by 10.5+ or -3.5 degrees (1170+ or -390 km) and rotated clockwise by 57+ or -11 degrees relative to the North American craton between 75 and 50 Ma. Except for the estimate from the nearby coeval Carmacks Group volcanic rocks, the Mount Lorne estimate is consistent with all other paleomagnetic results within the Stikine Terrane. These latter estimates are also consistent with plate-tectonic models that suggest the Pacific oceanic plates had an increased velocity northwards during the Late Cretaceous.
DE: amphibole-group; Canada-; Canadian-Cordillera; chain-silicates; characteristic-remanent-magnetization; Cretaceous-; dikes-; diorites-; emplacement-; faults-; geologic-barometry; geologic-thermometry; igneous-rocks; intrusions-; isothermal-remanent-magnetization; Lithoprobe-; magnetization-; Mesozoic-; monzodiorite-; Mount-Lorne; normal-faults; North-America; North-American-Cordillera; P-T-conditions; paleolatitude-; paleomagnetism-; plate-tectonics; plutonic-rocks; pole-positions; remanent-magnetization; saturation-magnetization; silicates-; Stikinia-Terrane; stocks-; tectonics-; terranes-; Upper-Cretaceous; Western-Canada; Yukon-Territory
CC: 12-Stratigraphy; 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
MC: LAT: N602800; N603300; LONG: W1344000; W1344800.
NN: Lithoprobe Contrib. No. 983.
IL: Refs: 36; illus. incl. 4 tables, geol. sketch maps.
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 2000-009824
UD: 200004

Title:
Paleomagnetic and geobarometric study of the Late Cretaceous Mount Lorne Stock, southern Yukon Territory.

Keywords:
amphibole-group; Canada-; Canadian-Cordillera; chain-silicates; characteristic-remanent-magnetization; Cretaceous-; dikes-; diorites-; emplacement-; faults-; geologic-barometry; geologic-thermometry; igneous-rocks; intrusions-; isothermal-remanent-magnetization; Lithoprobe-; magnetization-; Mesozoic-; monzodiorite-; Mount-Lorne; normal-faults; North-America; North-American-Cordillera; P-T-conditions; paleolatitude-; paleomagnetism-; plate-tectonics; plutonic-rocks; pole-positions; remanent-magnetization; saturation-magnetization; silicates-; Stikinia-Terrane; stocks-; tectonics-; terranes-; Upper-Cretaceous; Western-Canada; Yukon-Territory

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 6, Pages 905-915. 1999.


Citation_Text:
BK: Structure of the lithosphere within the Trans-Hudson Orogen (results of the 1993 Lithoprobe Trans-Hudson refraction experiment).
BA: Nemeth-Balazs
CP: Canada
PY: 1999
DG: Doctoral
DI: University of Saskatchewan. Saskatoon, SK, Canada. Pages: 143. 1999.
LA: English
AB: Data from three refraction profiles of the 1993 LITHOPROBE refraction experiment were used to investigate the structure of the lithosphere of the Trans-Hudson Orogen. Novel digital processing of the wide-angle reflections arrivals with standard type reflection processing techniques revealed significant crustal thickness and Moho reflectivity variations within the orogenic belt. The obtained information was than complemented with the results of near-vertical incidence seismic sections to estimate the crustal thickness variations over the entire study area. The detected crustal thickness and Moho reflectivity changes could not be correlated to the location and extent of geological domains; they appear to reflect the complex deformation and metamorphic history of the orogen. The P-wave velocity image of the crust and upper mantle was established through ray-tracing and inverse modelling of the primary and secondary crustal and mantle arrivals. Successful modelling of the observation required the incorporation of non-standard inversion techniques into the processing sequence. Although the detected crustal velocity variations appear to correlate well with the changes of Moho reflectivity. These variations in the property of the crust are interpreted to be a consequence of differences between the tectonic evolution of orogenic units in the north-western and south-eastern parts of the study area. The transition belt separating these two areas appear to coincide with an anomalous zone located in the upper mantle. This mantle region exhibits strong P-wave velocity anisotopy, determined primarily from modelling of the mantle refraction arrivals. I interpret this anomalous mantle region as a highly deformed zone, a possibly suture, between the two collided Archean plates of the orogen. Additional information on the structure of the mantle was obtained by analyzing the secondary mantle phases, observed at offsets larger than 400 km on the shot records. The broad structure of this deeper mantle region was established by incorporating the results of regional teleseismic studies into the velocity models and refining the models with ray-tracing. Detailed acoustic properties of the mantle were investigated after introducing random perturbations into the models and comparing the computed finite-difference synthetic-seismic responses to the observations.
DE: anisotropy-; Archean-; body-waves; Canadian-Shield; crust-; data-processing; deformation-; elastic-waves; finite-difference-analysis; geophysical-methods; geophysical-surveys; Hudsonian-Orogeny; Lithoprobe-; lithosphere-; mantle-; models-; Mohorovicic-discontinuity; North-America; orogenic-belts; P-waves; plate-collision; Precambrian-; refraction-methods; seismic-waves; seismograms-; statistical-analysis; surveys-; synthetic-seismograms; thickness-; velocity-structure
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Thesis-or-Dissertation
BL: Monograph
IL: Refs: 135; illus.
RF: GeoRef, Copyright 2000, American Geological Institute.
AN: 2000-004465
UD: 200002

Title:
Structure of the lithosphere within the Trans-Hudson Orogen (results of the 1993 Lithoprobe Trans-Hudson refraction experiment).

Keywords:
anisotropy-; Archean-; body-waves; Canadian-Shield; crust-; data-processing; deformation-; elastic-waves; finite-difference-analysis; geophysical-methods; geophysical-surveys; Hudsonian-Orogeny; Lithoprobe-; lithosphere-; mantle-; models-; Mohorovicic-discontinuity; North-America; orogenic-belts; P-waves; plate-collision; Precambrian-; refraction-methods; seismic-waves; seismograms-; statistical-analysis; surveys-; synthetic-seismograms; thickness-; velocity-structure


Citation_Text:
TI: Teleseismic monitoring in the Western Superior Transect of Lithoprobe (TW approximately ST experiment).
AU: Thomson-C-J
AF: Queen's University, Geological Sciences, Kingston, ON, Canada
BK: In: AGU 1998 spring meeting.
BA: Anonymous
CA: TWST97 Working Group, International
SO: Eos, Transactions, American Geophysical Union. 79; 17, Suppl., Pages 229. 1998.
PB: American Geophysical Union. Washington, DC, United States. 1998.
CP: United-States
PY: 1998
CN: American Geophysical Union 1998 spring meeting. Boston, MA, United States. May 26-29, 1998.
LA: English
DE: anisotropy-; Archean-; body-waves; broad-band-spectra; Canadian-Shield; continental-crust; cratons-; crust-; elastic-waves; Hudsonian-Orogeny; Lithoprobe-; mantle-; North-America; PASSCAL-; Precambrian-; S-waves; seismic-waves; seismographs-; short-period-waves; Superior-Province; teleseismic-signals; three-component-seismographs; upper-mantle; velocity-structure; wave-splitting; Western-Superior-Transect
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0096-3941
CO: EOSTAJ
AN: 2000-003379
UD: 200002

Title:
Teleseismic monitoring in the Western Superior Transect of Lithoprobe (TW approximately ST experiment).

Keywords:
anisotropy-; Archean-; body-waves; broad-band-spectra; Canadian-Shield; continental-crust; cratons-; crust-; elastic-waves; Hudsonian-Orogeny; Lithoprobe-; mantle-; North-America; PASSCAL-; Precambrian-; S-waves; seismic-waves; seismographs-; short-period-waves; Superior-Province; teleseismic-signals; three-component-seismographs; upper-mantle; velocity-structure; wave-splitting; Western-Superior-Transect

Issue:
Eos, Transactions, American Geophysical Union. 79; 17, Suppl., Pages 229. 1998.

Publisher:
American Geophysical Union. Washington, DC, United States. 1998.


Citation_Text:
TI: The Deep Probe experiments; continent scale active source seismic profiling.
AU: Henstock-T-J; Levander-A-R; Snelson-C-M; Keller-G-R; Gorman-A-R; Clowes-R-M; Braile-L-W; Humphreys-Eugene
AF: Rice University, Department of Geology & Geophysics, Houston, TX, United States
BK: In: AGU 1998 spring meeting.
BA: Anonymous
SO: Eos, Transactions, American Geophysical Union. 79; 17, Suppl., Pages 229. 1998.
PB: American Geophysical Union. Washington, DC, United States. 1998.
CP: United-States
PY: 1998
CN: American Geophysical Union 1998 spring meeting. Boston, MA, United States. May 26-29, 1998.
LA: English
DE: Alberta-; arrival-time; body-waves; Canada-; Canadian-Shield; Cheyenne-Belt; Colorado-Plateau; continental-crust; crust-; Deep-Probe; deep-seismic-sounding; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; Hearne-Province; Lithoprobe-; mantle-; Montana-; North-America; Pn-waves; Precambrian-; programs-; seismic-methods; seismic-profiles; seismic-waves; surveys-; terranes-; two-dimensional-models; United-States; upper-mantle; velocity-structure; Western-Canada; Wyoming-
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0096-3941
CO: EOSTAJ
AN: 2000-003377
UD: 200002

Author:
Henstock-T-J; Levander-A-R; Snelson-C-M; Keller-G-R; Gorman-A-R; Clowes-R-M; Braile-L-W; Humphreys-Eugene

Title:
The Deep Probe experiments; continent scale active source seismic profiling.

Keywords:
Alberta-; arrival-time; body-waves; Canada-; Canadian-Shield; Cheyenne-Belt; Colorado-Plateau; continental-crust; crust-; Deep-Probe; deep-seismic-sounding; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; Hearne-Province; Lithoprobe-; mantle-; Montana-; North-America; Pn-waves; Precambrian-; programs-; seismic-methods; seismic-profiles; seismic-waves; surveys-; terranes-; two-dimensional-models; United-States; upper-mantle; velocity-structure; Western-Canada; Wyoming-


Citation_Text:
TI: La Formation de la lithosphere precambrienne; images d'une croute formee par des processus episodiques d'accretion tangentielle
AU: Ludden-John
AF: CRPG-CNRS, Vandoeuvre-les-Nancy,
BK: In: 16>eme) reunion des sciences de la terre; Dynamique et economie Dynamique et economie de la Terre
BA: Anonymous
SO: Reunion Annuelle des Sciences de la Terre. 16; Pages 66. 1996.
PB: Societe Geologique de France. Paris, France. 1996.
CP: France
PY: 1996
CN: 16>eme) reunion des sciences de la terre; Dynamique et economie de la Terre. Orleans, France. April 10-12, 1996.
LA: French
DE: accretion-; Canadian-Shield; cratons-; crust-; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Grenville-Province; lateral-faults; Lithoprobe-; lithosphere-; North-America; plate-convergence; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; Superior-Province; surveys-; thickness-
CC: 16-Structural-geology
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 2000, American Geological Institute.
IS: 0249-7557
IB: 2-85363-073-0
CO: RASTCW
AN: 2000-002809
UD: 200001

Title:
La Formation de la lithosphere precambrienne; images d'une croute formee par des processus episodiques d'accretion tangentielle

Keywords:
accretion-; Canadian-Shield; cratons-; crust-; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Grenville-Province; lateral-faults; Lithoprobe-; lithosphere-; North-America; plate-convergence; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; Superior-Province; surveys-; thickness-

Issue:
Reunion Annuelle des Sciences de la Terre. 16; Pages 66. 1996.

Publisher:
Societe Geologique de France. Paris, France. 1996.


Citation_Text:
BK: Seismic velocities of crustal samples from the Torngat Peninsula and Nain; ECSOOT'96.
BA: Muzzatti-Angelina-M
CP: Canada
PY: 1998
DG: Bachelor's
DI: Dalhousie University. Halifax, NS, Canada. Pages: 95. 1998.
LA: English
AB: The subsurface geology of central and northern Labrador, as well as the Labrador Shelf, is presently being interpreted through the use of various seismic techniques. In the fall of 1996, LITHOPROBE funded a wide-angle seismic refraction experiment (ECSOOT'96) off the coast of Labrador to determine the subsurface geology of in situ mid-lower crust along the Labrador coast to Moho depth. Forty representative samples were collected from two areas of Labrador, namely the Torngat Peninsula and southern Nain Province. Laboratory measurements of compressional and shear wave velocities to confining pressures of 600 MPa were performed on the sample set, the results of which will be used for comparison with offshore seismic data to determine the lithologic nature of the mid-lower crust. Seismic velocities from both sample sets fall within two overlapping fields, felsic and mafic. Felsic samples from the Torngat Peninsula have compressional wave velocities (Vp) ranging from 6.2-6.6 km/s and shear wave velocities (Vs) from 3.6-4.0 km/s, while mafic samples have Vp between 6.5-7.2 km/s and Vs between 3.8-4.2 km/s. Felsic samples from the southern Nain Province have Vp between 6.2-6.7 km/s, and Vs between 3.5-3.7 km/s, while mafic samples have Vp between 6.7-7.0 km/s and Vs between 3.7-4.0 km/s. Anisotropic samples were found in both regions of Labrador, as determined by both compressional and shear wave velocity data. Anisotropic samples were typically mafic and/or displayed a definite foliation and/or lineation defined by the orientation of anisotropic minerals. Based on this data it can be concluded that strong reflections would most likely be produced by contrasts between mafic and felsic rocks. Based on seismic refraction data from the Torngat Peninsula, the predominantly felsic rocks that occur onshore in outcrop continue at depth and become increasingly mafic within the lower crust (20-40 km depth).
DE: anisotropy-; body-waves; Canada-; Canadian-Shield; crust-; Eastern-Canada; ECSOOT'-96-Program; elastic-waves; foliation-; geophysical-methods; geophysical-profiles; geophysical-surveys; geotraverses-; Labrador-; Labrador-Shelf; lineation-; lithofacies-; Lithoprobe-; lower-crust; Mohorovicic-discontinuity; Nain-Province; Newfoundland-; North-America; P-waves; programs-; reflection-methods; S-waves; seismic-methods; seismic-profiles; seismic-waves; surveys-; Torngat-Peninsula; velocity-structure
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Thesis-or-Dissertation
BL: Monograph
IL: Refs: 21; 9 tables, illus.
RF: GeoRef, Copyright 2000, American Geological Institute.
AN: 2000-001742
UD: 200001

Title:
Seismic velocities of crustal samples from the Torngat Peninsula and Nain; ECSOOT'96.

Keywords:
anisotropy-; body-waves; Canada-; Canadian-Shield; crust-; Eastern-Canada; ECSOOT'-96-Program; elastic-waves; foliation-; geophysical-methods; geophysical-profiles; geophysical-surveys; geotraverses-; Labrador-; Labrador-Shelf; lineation-; lithofacies-; Lithoprobe-; lower-crust; Mohorovicic-discontinuity; Nain-Province; Newfoundland-; North-America; P-waves; programs-; reflection-methods; S-waves; seismic-methods; seismic-profiles; seismic-waves; surveys-; Torngat-Peninsula; velocity-structure


Citation_Text:
BK: Structure and physical properties of the Earth's crust in the Central Metasedimentary Belt, Grenville Province, Ontario from near vertical seismic reflection data.
BA: Roy-Baishali
CP: Canada
PY: 1997
DG: Doctoral
DI: University of Western Ontario. London, ON, Canada. Pages: 320. 1997.
LA: English
DE: attenuation-; Canada-; Canadian-Shield; Central-Metasedimentary-Belt; common-depth-point-method; corrections-; crust-; Eastern-Canada; elastic-constants; faults-; geophysical-methods; geophysical-surveys; Grenville-Province; Grenvillian-Orogeny; heterogeneity-; lineaments-; Lithoprobe-; normal-moveout; North-America; Ontario-; orientation-; pattern-recognition; physical-properties; Poisson'-s-ratio; Precambrian-; reflection-methods; seismic-methods; signal-to-noise-ratio; stacking-; surveys-; thrust-faults; variations-; velocity-
CC: 16-Structural-geology; 20-Applied-geophysics
DT: Thesis-or-Dissertation
BL: Monograph
RF: GeoRef, Copyright 1999, American Geological Institute.
IB: 0-612-28520-0
AV: University Microfilms, Ann Arbor, MI, United States
AN: 1999-073328
UD: 199924

Title:
Structure and physical properties of the Earth's crust in the Central Metasedimentary Belt, Grenville Province, Ontario from near vertical seismic reflection data.

Keywords:
attenuation-; Canada-; Canadian-Shield; Central-Metasedimentary-Belt; common-depth-point-method; corrections-; crust-; Eastern-Canada; elastic-constants; faults-; geophysical-methods; geophysical-surveys; Grenville-Province; Grenvillian-Orogeny; heterogeneity-; lineaments-; Lithoprobe-; normal-moveout; North-America; Ontario-; orientation-; pattern-recognition; physical-properties; Poisson'-s-ratio; Precambrian-; reflection-methods; seismic-methods; signal-to-noise-ratio; stacking-; surveys-; thrust-faults; variations-; velocity-


Citation_Text:
TI: How will Lithoprobe's final chapter be written?.
AU: Percival-John-A; Lucas-Stephen-B; Jones-Alan-G; Beaumont-Christopher; Eaton-David; Rivers-Toby
AF: Geological Survey of Canada, Ottawa, ON, Canada
SO: Geoscience Canada. 26; 1, Pages 17-26. 1999.
PB: Geological Association of Canada. Toronto, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: Fifteen years after pioneering a program of integrated research in the earth sciences, LITHOPROBE faces the challenge of assembling and integrating results acquired in ten transects across the Canadian landmass that have sampled four billion years of Earth history. Beyond the data legacy that LITHOPROBE will leave, a global synthesis is planned that will serve as a comprehensive conceptual framework for the structure and evolution of the continental crust. A Pan-LITHOPROBE subcommittee, formed to provide guidance through the synthesis process, is proposing that LITHOPROBE insights be used to address current thematic issues of global relevance and interest. To obtain broad input to the synthesis, LITHOPROBE will sponsor a series of thematic workshops on topics including: Variations and Styles of Tectonic Processes through Space and Time; Crustal Growth, Preservation and Recycling; Magmatic, Metamorphic and Tectonic Processes; and Lower Crust, Moho and Mantle Lithosphere. Each workshop will yield a LITHOPROBE report and initiate work on formal publication volumes. We solicit suggestions for additional unifying themes.
DE: Canada-; Canadian-Shield; continental-crust; crust-; geotraverses-; Lithoprobe-; magmatism-; metamorphism-; North-America; objectives-; orogenic-belts; programs-; tectonics-
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
IL: Refs: 71; illus. incl. sects., sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0315-0941
CO: GSCNA5
AN: 1999-070594
UD: 199924

Author:
Percival-John-A; Lucas-Stephen-B; Jones-Alan-G; Beaumont-Christopher; Eaton-David; Rivers-Toby

Title:
How will Lithoprobe's final chapter be written?.

Keywords:
Canada-; Canadian-Shield; continental-crust; crust-; geotraverses-; Lithoprobe-; magmatism-; metamorphism-; North-America; objectives-; orogenic-belts; programs-; tectonics-

Issue:
Geoscience Canada. 26; 1, Pages 17-26. 1999.

Publisher:
Geological Association of Canada. Toronto, ON, Canada. 1999.


Citation_Text:
TI: Timing and kinematics of post-Timiskaming deformation within the Larder Lake-Cadillac deformation zone, Southwest Abitibi greenstone belt, Ontario, Canada.
AU: Wilkinson-Lori; Cruden-Alexander-R; Krogh-Thomas-E
AF: University of Toronto, Department of Geology, Mississauga, ON, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 4, Pages 627-647. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The Larder Lake-Cadillac deformation zone is one of several anastomosing zones of high strain within the Abitibi greenstone belt. In the Kirkland Lake area, Ontario, the Larder Lake-Cadillac deformation zone is characterized by extensive carbonate and chlorite alteration, strong south-dipping foliations, and steep lineations. These features formed during two ductile deformation increments, D (sub 2) and D (sub 3) , that occurred after deposition of Timiskaming assemblage sediments. D (sub 2) strain accumulation and greenschist facies metamorphism and alteration were localized within the deformation zone, facilitated by channelling of hydrothermal fluids within a preexisting structure, possibly formed during early D (sub 1) terrane accretion. During D (sub 2) north-south shortening, east-west-trending sectors of the deformation zone accumulated bulk coaxial strains, while southeast- and northeast-trending sectors experienced, respectively, dextral and sinistral transpressive deformations. Preservation of Timiskaming assemblage sediments in the footwall of the deformation zone indicates a component of south-over-north (reverse) displacement that is not recorded by D (sub 2) fabrics. Northwest-southeast D (sub 3) compression resulted in the formation of a regional, northeast-striking cleavage formed under regional greenschist facies conditions, and local dextral reactivation of suitably oriented sections of the Larder Lake-Cadillac deformation zone. The Murdoch Creek and Label stocks abut the Larder Lake-Cadillac deformation zone. Their internal structure and emplacement are interpreted to be a consequence of D (sub 2) north-south shortening. Magmatic zircon and titanite in the Murdoch Creek and Lebel stocks yield U-Pb geochronology ages of 2672+ or -2 and 2673+ or -2 Ma, providing a maximum age for D (sub 2) deformation. Hydrothermal titanite associated with S (sub 3) foliation in the Murdoch Creek stock gives an U-Pb age of 2665+ or -4 Ma, the maximum age of D (sub 3) deformation. Pluton emplacement, deformation, and coincident metamorphism occurred over a span of 1 Ma (from 2670 to 2669 Ma) to over 14 Ma (from 2675 to 2661 Ma), during a regime of north-south, followed by northwest-southeast, regional shortening.
DE: Abitibi-Belt; absolute-age; Archean-; Cadillac-Ontario; Canada-; Canadian-Shield; dates-; deformation-; Eastern-Canada; emplacement-; facies-; greenschist-facies; greenstone-belts; intrusions-; kinematics-; Kirkland-Lake-Ontario; Larder-Lake-District-Ontario; Lithoprobe-; magmatism-; metamorphic-belts; metamorphic-rocks; metamorphism-; metasedimentary-rocks; metavolcanic-rocks; nesosilicates-; North-America; Ontario-; orthosilicates-; plutons-; polyphase-processes; Precambrian-; regional-metamorphism; silicates-; stocks-; strain-; structural-analysis; Superior-Province; tectonics-; Timiskaming-District-Ontario; titanite-; U-Pb; zircon-
CC: 16-Structural-geology; 03-Geochronology
DT: Serial
BL: Analytic
MC: LAT: N481000; N481000; LONG: W0800200; W0800200.
NN: Geol. Surv. Can., Contrib. No. 1998034; Lithoprobe Publ. No. 973.
IL: Refs: 58; illus. incl. block diag., 2 tables, geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-070058
UD: 199924

Title:
Timing and kinematics of post-Timiskaming deformation within the Larder Lake-Cadillac deformation zone, Southwest Abitibi greenstone belt, Ontario, Canada.

Keywords:
Abitibi-Belt; absolute-age; Archean-; Cadillac-Ontario; Canada-; Canadian-Shield; dates-; deformation-; Eastern-Canada; emplacement-; facies-; greenschist-facies; greenstone-belts; intrusions-; kinematics-; Kirkland-Lake-Ontario; Larder-Lake-District-Ontario; Lithoprobe-; magmatism-; metamorphic-belts; metamorphic-rocks; metamorphism-; metasedimentary-rocks; metavolcanic-rocks; nesosilicates-; North-America; Ontario-; orthosilicates-; plutons-; polyphase-processes; Precambrian-; regional-metamorphism; silicates-; stocks-; strain-; structural-analysis; Superior-Province; tectonics-; Timiskaming-District-Ontario; titanite-; U-Pb; zircon-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 4, Pages 627-647. 1999.


Citation_Text:
TI: Age and isotopic composition of late Archean leucogranites; implications for continental collision in the western Superior Province.
AU: Larbi-Y; Stevenson-R; Breaks-F; Machado-N; Gariepy-C
AF: Universite du Quebec a Montreal, Departement des Sciences de la Terre, Montreal, PQ, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 4, Pages 495-510. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: U-Pb and Sm-Nd isotopic data are presented for leucogranites and pegmatites from the boundary zones of the English River, Winnipeg River, and Wabigoon subprovinces in the late Archean Superior Province of northwestern Ontario. The Ghost Lake batholith and the Separation Rapids pluton are posttectonic, rare-metal-bearing, S-type leucogranites that were generated during the final stages of the amalgamation of the Superior Province. U-Pb dating of monazites yields ages of 2650+ or -3 Ma for a pegmatite from the Dryden area and 2646+ or -2 Ma for the Separation Rapids Pluton. Sm-Nd data from these granitoids are compared with similar data from late Archean intrusions and adjacent rocks from the same regions. Values of epsilon (sub Nd) range from 0 to +2 for pretectonic tonalites, from -2 to +2 for both the Ghost Lake batholith and the Separation Rapids pluton, from +1 to +3.5 for metavolcanic rocks, and from -0.5 to -1.5 for metasedimentary rocks. There is an overall trend of decreasing epsilon (sub Nd) values from pretectonic tonalites to the latest leucocratic pegmatites. This reflects the origin of more and more granitoids as a result of anatexis as the crust grew and thickened through accretion. The ranges of epsilon (sub Nd) values found among leucogranites from the two regions overlap with the isotopic values of the basalts and sediments. This suggests that the leucogranites were generated by similar processes involving both a crustal and a juvenile mantle component. Furthermore, the ages from this study and from pegmatites (2652-2643 Ma) in the Bird River greenstone belt provide the best estimate of the age of rare metal mineralization in the western Superior Province. Similar ages (2651-2639 Ma) for rare-metal-bearing leucogranites in southern Abitibi subprovince suggest a specific period of emplacement over a wide area.
DE: absolute-age; anatexis-; Archean-; batholiths-; Canada-; Canadian-Shield; continental-crust; crust-; dates-; Eastern-Canada; English-River-Belt; geochemistry-; Ghost-Lake-Batholith; granites-; greenstone-belts; igneous-rocks; intrusions-; isotope-ratios; isotopes-; leucogranite-; Lithoprobe-; metals-; metamorphic-belts; metamorphic-rocks; metasedimentary-rocks; metavolcanic-rocks; monazite-; Nd-144-Nd-143; neodymium-; North-America; northwestern-Ontario; Ontario-; pegmatite-; phosphates-; plate-collision; plate-tectonics; plutonic-rocks; plutons-; Precambrian-; rare-earths; Separation-Rapids-Pluton; Sm-Nd; stable-isotopes; Superior-Province; supracrustals-; terranes-; U-Pb; upper-Archean; Wabigoon-Belt; Winnipeg-River-Belt
CC: 05A-Igneous-and-metamorphic-petrology; 03-Geochronology
DT: Serial
BL: Analytic
MC: LAT: N490000; N503000; LONG: W0920000; W0940000.
NN: Lithoprobe Publ. No. 968.
IL: Refs: 60; illus. incl. 2 tables, geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-070050
UD: 199924

Author:
Larbi-Y; Stevenson-R; Breaks-F; Machado-N; Gariepy-C

Title:
Age and isotopic composition of late Archean leucogranites; implications for continental collision in the western Superior Province.

Keywords:
absolute-age; anatexis-; Archean-; batholiths-; Canada-; Canadian-Shield; continental-crust; crust-; dates-; Eastern-Canada; English-River-Belt; geochemistry-; Ghost-Lake-Batholith; granites-; greenstone-belts; igneous-rocks; intrusions-; isotope-ratios; isotopes-; leucogranite-; Lithoprobe-; metals-; metamorphic-belts; metamorphic-rocks; metasedimentary-rocks; metavolcanic-rocks; monazite-; Nd-144-Nd-143; neodymium-; North-America; northwestern-Ontario; Ontario-; pegmatite-; phosphates-; plate-collision; plate-tectonics; plutonic-rocks; plutons-; Precambrian-; rare-earths; Separation-Rapids-Pluton; Sm-Nd; stable-isotopes; Superior-Province; supracrustals-; terranes-; U-Pb; upper-Archean; Wabigoon-Belt; Winnipeg-River-Belt

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 4, Pages 495-510. 1999.


Citation_Text:
TI: Kilometre-scale folding in the Teslin Zone, northern Canadian Cordillera, and its tectonic implications for the accretion of the Yukon-Tanana Terrane to North America.
AU: de-Keijzer-Martin; Williams-Paul-F; Brown-Richard-L
AF: University of New Brunswick, Department of Geology, Fredericton, NB, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 3, Pages 479-494. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The Teslin zone in south-central Yukon has previously been described as a discrete zone with a steep foliation unique to the zone. It includes the Anvil assemblage and the narrowest portion of the Yukon-Tanana terrane (the Nisutlin assemblage), and is defined by post-accretionary faults: the Big Salmon fault to the west and the d'Abbadie fault system to the east. The zone was interpreted as a lithospheric suture or a crustal-scale transpression zone, and as the root zone of klippen lying on the North American craton to the east. We demonstrate that deformation and metamorphism are the same inside and outside the zone. The steep transposition foliation in the zone, in contrast to adjacent rocks to the east, coincides with the steep limb of a regional F (sub 3) structure. This fold has a shallow limb in the easternmost part of the zone and immediately east of the zone. Thus we reject earlier interpretations. If a suture exists between the obducted Anvil and Yukon-Tanana Nisutlin assemblages and North America, it is a shear zone that occurs at the base of the obducted rocks, which has been folded by the F (sub 3) fold. However, evidence that this thrust boundary is a lithospheric suture is lacking. A consequence of our interpretation is that North American rocks pass under the eastern Teslin zone and outcrop to the west of the Nisutlin and Anvil assemblages. This geometry precludes the possibility of the Teslin zone being the root zone of the klippen.
DE: accretion-; Canada-; Canadian-Cordillera; deformation-; faults-; folds-; foliation-; geometry-; klippen-; Lithoprobe-; metamorphic-rocks; North-America; North-American-Cordillera; overturned-folds; plate-tectonics; shear-zones; structural-analysis; synform-folds; tectonics-; terranes-; Teslin-Zone; thrust-faults; Western-Canada; Yukon-Territory; Yukon-Tanana-Terrane
CC: 16-Structural-geology
DT: Serial
BL: Analytic
MC: LAT: N613500; N614300; LONG: W1340000; W1342500.
NN: Lithoprobe Publ. No. 923.
IL: Refs: 46; illus. incl. block diags., 1 table, geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-070049
UD: 199924

Title:
Kilometre-scale folding in the Teslin Zone, northern Canadian Cordillera, and its tectonic implications for the accretion of the Yukon-Tanana Terrane to North America.

Keywords:
accretion-; Canada-; Canadian-Cordillera; deformation-; faults-; folds-; foliation-; geometry-; klippen-; Lithoprobe-; metamorphic-rocks; North-America; North-American-Cordillera; overturned-folds; plate-tectonics; shear-zones; structural-analysis; synform-folds; tectonics-; terranes-; Teslin-Zone; thrust-faults; Western-Canada; Yukon-Territory; Yukon-Tanana-Terrane

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 3, Pages 479-494. 1999.


Citation_Text:
BK: Experimental seismic surveys of the Trans-Hudson Orogen.
BA: Bezdan-Sandor
CP: Canada
PY: 1998
DG: Doctoral
DI: University of Saskatchewan. Saskatoon, SK, Canada. Pages: 111. 1998.
LA: English
DE: amplitude-; crust-; data-acquisition; explosions-; geophysical-methods; geophysical-profiles; geophysical-surveys; Hudsonian-Orogeny; Lithoprobe-; lower-crust; mapping-; Mohorovicic-discontinuity; North-America; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; signal-to-noise-ratio; surveys-; traveltime-; velocity-; Vibroseis-
CC: 20-Applied-geophysics
DT: Thesis-or-Dissertation
BL: Monograph
RF: GeoRef, Copyright 1999, American Geological Institute.
IB: 0-612-27400-4
AV: University Microfilms, Ann Arbor, MI, United States
AN: 1999-069431
UD: 199924

Title:
Experimental seismic surveys of the Trans-Hudson Orogen.

Keywords:
amplitude-; crust-; data-acquisition; explosions-; geophysical-methods; geophysical-profiles; geophysical-surveys; Hudsonian-Orogeny; Lithoprobe-; lower-crust; mapping-; Mohorovicic-discontinuity; North-America; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; signal-to-noise-ratio; surveys-; traveltime-; velocity-; Vibroseis-


Citation_Text:
TI: Shear wave splitting observations in the Archean Craton of western Superior.
AU: Kay-I; Sol-S; Kendall-J-M; Thomson-C; White-D; Asudeh-I; Roberts-B; Francis-D
AF: Geological Survey of Canada, Ottawa, ON, Canada
SO: Geophysical Research Letters. 26; 17, Pages 2669-2672. 1999.
PB: American Geophysical Union. Washington, DC, United States. 1999.
CP: United-States
PY: 1999
LA: English
DE: anisotropy-; Archean-; body-waves; Canadian-Shield; core-; core-mantle-boundary; elastic-waves; geotraverses-; Lithoprobe-; lower-mantle; mantle-; North-America; outer-core; Precambrian-; S-waves; seismic-waves; Superior-Province; teleseismic-signals; Teleseismic-Western-Superior-Transect; upper-mantle; wave-splitting
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
IL: Refs: 14; illus. incl. 2 tables, geol. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0094-8276
CO: GPRLAJ
AN: 1999-067645
UD: 199923

Author:
Kay-I; Sol-S; Kendall-J-M; Thomson-C; White-D; Asudeh-I; Roberts-B; Francis-D

Title:
Shear wave splitting observations in the Archean Craton of western Superior.

Keywords:
anisotropy-; Archean-; body-waves; Canadian-Shield; core-; core-mantle-boundary; elastic-waves; geotraverses-; Lithoprobe-; lower-mantle; mantle-; North-America; outer-core; Precambrian-; S-waves; seismic-waves; Superior-Province; teleseismic-signals; Teleseismic-Western-Superior-Transect; upper-mantle; wave-splitting

Issue:
Geophysical Research Letters. 26; 17, Pages 2669-2672. 1999.


Citation_Text:
TI: Canada's LITHOPROBE Project (collaborative, multidisciplinary geoscience research leads to new understanding of continental evolution).
AU: Clowes-Ron; Cook-Frederick; Hajnal-Zoltan; Hall-Jeremy; Lewry-John; Lucas-Stephen; Wardle-Richard
AF: University of British Columbia, Vancouver, BC, Canada
SO: Episodes. 22; 1, Pages 3-20. 1999.
PB: International Union of Geological Sciences (IUGS). Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
AB: LITHOPROBE is a scientific project of international stature and the largest earth science research project ever undertaken in Canada. It comprises a series of research teams carrying out collaborative, multidisciplinary investigations of the nature and evolution of the Earth's lithosphere in ten carefully selected transects (study areas) on the Canadian landmass and surrounding continental margins. The project began in 1984 and will conclude in 2003 following syntheses of transect studies and a pan-LITHOPROBE synthesis. In this review, three examples -- (1) the Late Archean-Paleoproterozoic assembly of northeastern Laurentia, (2) evolution of the Paleoproterozoic Trans-Hudson Orogen, and (3) development of the Mesozoic-Tertiary southern Canadian Cordillera -- exemplify the extensive results. (1) In remote Labrador and northern Quebec, tectonic development of northeastern Laurentia occurred from about 2.5 to 1.7 Ga. It involved the convergent northward drift of two Archean cratons, Superior to the west and Nain to the east, and their ultimate collision with the more northerly Rae Province of the Canadian Precambrian Shield. These movements led to the generation of two orogens, initially the more eastern Torngat Orogen and later the New Quebec Orogen. Primary tectonic activity was brought to a close by post-collisional northerly indentation of the Superior craton and reactivation of the Torngat Orogen. (2) In Saskatchewan and Manitoba, the Paleoproterozoic Trans-Hudson Orogen is the best exposed and most complete orogenic belt of a network of such belts formed by collision of older Archean microcontinents. Understanding of its architecture and tectonic history has been changed fundamentally by LITHOPROBE research. This has resulted in a new working model, chronologically well constrained, for tectonic evolution of the orogen between 2.4 and 1.7 Ga. A previously unknown Archean microcontinent has been identified, and the economically important greenstone belt of the Saskatchewan-Manitoba borderland has been revealed to be a collage of oceanic/arc volcanic assemblages that were later intruded and overlain by volcanic, plutonic, and sedimentary rocks. (3) In British Columbia, the much younger (Phanerozoic) orogen of the southern Canadian Cordillera was the first in which the so-called "exotic" terranes were recognized as fundamental building blocks of the continent. Among many contributions, LITHOPROBE studies in the southern Cordillera have shown that terranes observed on the surface are decoupled from their mantle and lower crust and attached as thin flakes to the craton, and that a thin lithosphere underlies the central part of the orogen. LITHOPROBE has brought many benefits to Canada. Other countries may well find that similar, collaborative, multidisciplinary research projects in the earth sciences are comparably beneficial to them.
DE: Canada-; Canadian-Cordillera; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; geotraverses-; Hudsonian-Orogeny; Labrador-; Laurentia-; Lithoprobe-; models-; Newfoundland-; North-America; North-American-Cordillera; plate-tectonics; Precambrian-; programs-; seismic-methods; seismic-profiles; surveys-; Western-Canada
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
IL: Refs: 84; illus. incl. sects., geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0705-3797
CO: GENWBO
AN: 1999-065945
UD: 199922

Author:
Clowes-Ron; Cook-Frederick; Hajnal-Zoltan; Hall-Jeremy; Lewry-John; Lucas-Stephen; Wardle-Richard

Title:
Canada's LITHOPROBE Project (collaborative, multidisciplinary geoscience research leads to new understanding of continental evolution).

Keywords:
Canada-; Canadian-Cordillera; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; geotraverses-; Hudsonian-Orogeny; Labrador-; Laurentia-; Lithoprobe-; models-; Newfoundland-; North-America; North-American-Cordillera; plate-tectonics; Precambrian-; programs-; seismic-methods; seismic-profiles; surveys-; Western-Canada

Publisher:
International Union of Geological Sciences (IUGS). Ottawa, ON, Canada. 1999.


Citation_Text:
TI: Proterozoic and Cenozoic subduction complexes; a comparison of geometric features.
AU: van-der-Velden-Arie-J; Cook-Frederick-A
AF: University of Calgary, Department of Geology and Geophysics, Calgary, AB, Canada
SO: Tectonics. 18; 4, Pages 575-581. 1999.
PB: American Geophysical Union. Washington, DC, United States. 1999.
CP: United-States
PY: 1999
LA: English
DE: accretionary-wedges; basins-; British-Columbia; Canada-; Canadian-Shield; Cenozoic-; fore-arc-basins; geometry-; geophysical-methods; geophysical-profiles; geophysical-surveys; island-arcs; Lithoprobe-; mantle-; Mohorovicic-discontinuity; North-America; Precambrian-; Proterozoic-; reflection-methods; seismic-methods; seismic-profiles; Slave-Province; subduction-zones; surveys-; tectonics-; upper-Precambrian; Vancouver-Island; Western-Canada
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
MC: LAT: N610000; N620000; LONG: W1110000; W1160000.
IL: Refs: 23; illus. incl. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0278-7407
CO: TCTNDM
AN: 1999-061541
UD: 199921

Title:
Proterozoic and Cenozoic subduction complexes; a comparison of geometric features.

Keywords:
accretionary-wedges; basins-; British-Columbia; Canada-; Canadian-Shield; Cenozoic-; fore-arc-basins; geometry-; geophysical-methods; geophysical-profiles; geophysical-surveys; island-arcs; Lithoprobe-; mantle-; Mohorovicic-discontinuity; North-America; Precambrian-; Proterozoic-; reflection-methods; seismic-methods; seismic-profiles; Slave-Province; subduction-zones; surveys-; tectonics-; upper-Precambrian; Vancouver-Island; Western-Canada


Citation_Text:
TI: Coeval sedimentation, magmatism, and fold-thrust belt development in the Trans-Hudson Orogen; geochronological evidence from the Wekusko Lake area, Manitoba, Canada.
AU: Ansdell-Kevin-M; Connors-Karen-A; Stern-Richard-A; Lucas-Stephen-B
AF: University of Saskatchewan, Department of Geological Sciences, Saskatoon, SK, Canada
BK: In: NATMAP Shield Margin Project, Volume 1--Le projet du bord du Bouclier NATMAP, Volume 1.
BA: Lucas-Stephen-B (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 293-312. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: Lithological and structural mapping in the east Wekusko Lake area of the Flin Flon Belt, Trans-Hudson Orogen, suggested an intimate relationship between magmatism, fluvial sedimentation, and initiation of fold and thrust belt deformation. Conventional U-Pb geochronology of volcanic rocks in fault-bounded assemblages provides a minimum age of 1876+ or -2 Ma for McCafferty Liftover back-arc basalts, and ages of between 1833 and 1836 Ma for the Herb Lake volcanic rocks. A rhyolite which unconformably overlies Western Missi Group fluvial sedimentary rocks has complex zircon systematics. This rock may be as old as about 1856 Ma or as young as 1830 Ma. The sedimentary rocks overlying this rhyolite are locally intercalated with 1834 Ma felsic volcanic rocks, and yield sensitive high resolution ion microprobe (SHRIMP) U-Pb and Pb-evaporation detrital zircon ages ranging from 1834 to 2004 Ma. The Eastern Missi Group is cut by an 1826+ or -4 Ma felsic dyke, and contains 1832-1911 Ma detrital zircons. The dominant source for detritus in the Missi Group was the Flin Flon accretionary collage and associated successor arc rocks. The fluvial sedimentary rocks and the Herb Lake volcanic rocks were essentially coeval, and were then incorporated into a southwest-directed fold and thrust belt which was initiated at about 1840 Ma and active until at least peak regional metamorphism.
DE: absolute-age; Canada-; Canadian-Shield; continental-crust; crust-; dates-; depositional-environment; faults-; Flin-Flon-Belt; fluvial-environment; fold-and-thrust-belts; folds-; Hudsonian-Orogeny; Lithoprobe-; magmatism-; Manitoba-; metamorphic-rocks; metasedimentary-rocks; metavolcanic-rocks; NATMAP-Shield-Margin-Project; nesosilicates-; North-America; orthosilicates-; Paleoproterozoic-; Precambrian-; Proterozoic-; SHRIMP-data; silicates-; thrust-faults; U-Pb; upper-Precambrian; Wekusko-Lake; Western-Canada; zircon-
CC: 03-Geochronology
DT: Serial
BL: Analytic
MC: LAT: N543500; N550500; LONG: W0993500; W1010500.
NN: Lithoprobe Publ. No. 943.
IL: Refs: 64; illus. incl. 4 tables, geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-061537
UD: 199921

Title:
Coeval sedimentation, magmatism, and fold-thrust belt development in the Trans-Hudson Orogen; geochronological evidence from the Wekusko Lake area, Manitoba, Canada.

Keywords:
absolute-age; Canada-; Canadian-Shield; continental-crust; crust-; dates-; depositional-environment; faults-; Flin-Flon-Belt; fluvial-environment; fold-and-thrust-belts; folds-; Hudsonian-Orogeny; Lithoprobe-; magmatism-; Manitoba-; metamorphic-rocks; metasedimentary-rocks; metavolcanic-rocks; NATMAP-Shield-Margin-Project; nesosilicates-; North-America; orthosilicates-; Paleoproterozoic-; Precambrian-; Proterozoic-; SHRIMP-data; silicates-; thrust-faults; U-Pb; upper-Precambrian; Wekusko-Lake; Western-Canada; zircon-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 293-312. 1999.


Citation_Text:
TI: Coeval sedimentation, magmatism, and fold-thrust development in the Trans-Hudson Orogen; propagation of deformation into an active continental arc setting, Wekusko Lake area, Manitoba.
AU: Connors-Karen-A; Ansdell-Kevin-M; Lucas-Stephen-B
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: NATMAP Shield Margin Project, Volume 1--Le projet du bord du Bouclier NATMAP, Volume 1.
BA: Lucas-Stephen-B (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 275-291. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: Early structures in the southeastern part of the Trans-Hudson Orogen (THO), Wekusko Lake area, Manitoba, comprise northwest-verging folds and a set of steep, southeast-dipping faults that occur at a low angle to bedding. Kinematic indicators are rare, however, the vergence of the associated folds supports reverse movement on the faults. These folds and faults formed prior to the peak of regional metamorphism and therefore must correlate with the widely recognised deformational (D2) event which developed pre- to syn-metamorphism and involved development of a regional, south- to southwest-directed fold-thrust belt. The D2 folds and reverse faults in the study area are interpreted to have originally formed as gently dipping, southwest-verging structures, i.e., as inclined folds and thrust faults, which were then rotated into a steep, northwest-verging orientation during later deformation (D3). In the southeastern THO, regional D2 fold and thrust structures are cut by ca. 1839-1830 Ma plutons, indicating that D2 initiated prior to ca. 1839 Ma. Recognition of these structures in the study area, and their relationships to key stratigraphic units, has provided significant insights into the tectonic setting during the regional D2 event. The D2 fold and thrust structures deform ca. 1834 Ma fluvial sedimentary rocks and ca. 1836-1832 Ma volcanic (subaerial) and plutonic rocks with a "continental" arc geochemical signature. These are the youngest known volcanic and sedimentary rocks within the THO. The subaerial deposition of these young rocks was coeval with initiation of D2 deformation in the region. They were then rapidly incorporated into the thrust fault sequence soon after their formation, which suggests that the fold and thrust structures propagated into a zone of active magmatism which must have been located in the foreland to the belt of thrusting and folding.
DE: Canada-; Canadian-Shield; continental-crust; crust-; deformation-; faults-; Flin-Flon-Belt; fold-and-thrust-belts; folds-; Hudsonian-Orogeny; Lithoprobe-; magmatism-; Manitoba-; metamorphic-rocks; metamorphism-; metasedimentary-rocks; metavolcanic-rocks; NATMAP-Shield-Margin-Project; North-America; orogeny-; Paleoproterozoic-; polyphase-processes; Precambrian-; Proterozoic-; regional-metamorphism; reverse-faults; structural-analysis; tectonics-; tectonostratigraphic-units; thrust-faults; upper-Precambrian; Wekusko-Lake; Western-Canada
CC: 16-Structural-geology
DT: Serial
BL: Analytic
MC: LAT: N544200; N545630; LONG: W0993200; W0995000.
NN: Geol. Surv. Can. Contrib. No. 13595; Lithoprobe Publ. No. 964.
IL: Refs: 53; illus. incl. sects., 1 table, geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-061536
UD: 199921

Title:
Coeval sedimentation, magmatism, and fold-thrust development in the Trans-Hudson Orogen; propagation of deformation into an active continental arc setting, Wekusko Lake area, Manitoba.

Keywords:
Canada-; Canadian-Shield; continental-crust; crust-; deformation-; faults-; Flin-Flon-Belt; fold-and-thrust-belts; folds-; Hudsonian-Orogeny; Lithoprobe-; magmatism-; Manitoba-; metamorphic-rocks; metamorphism-; metasedimentary-rocks; metavolcanic-rocks; NATMAP-Shield-Margin-Project; North-America; orogeny-; Paleoproterozoic-; polyphase-processes; Precambrian-; Proterozoic-; regional-metamorphism; reverse-faults; structural-analysis; tectonics-; tectonostratigraphic-units; thrust-faults; upper-Precambrian; Wekusko-Lake; Western-Canada

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 275-291. 1999.


Citation_Text:
TI: Age and origin of the Jan Lake Complex; a glimpse at the buried Archean craton of the Trans-Hudson Orogen.
AU: Ashton-K-E; Heaman-Larry-M; Lewry-J-F; Hartlaub-R-P; Shi-R
AF: Saskatchewan Geological Survey, Regina, SK, Canada
BK: In: NATMAP Shield Margin Project, Volume 1--Le projet du bord du Bouclier NATMAP, Volume 1.
BA: Lucas-Stephen-B (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 185-208. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The largely buried Sask Craton is a continental fragment or microcontinent that collided with and underthrust the Paleoproterozoic Flin Flon-Glennie protocontinent along the Pelican Decollement Zone at 1840-1830 Ma. Rocks of the Sask Craton are exposed in three tectonic windows. Those of the Pelican Window have been named the Jan Lake Complex and comprise > or =2960 Ma arc-derived leucocratic orthogneisses, migmatitic paragneisses, and a tholeiitic, within-plate igneous suite comprising 2488 Ma dioritic to gabbroic rocks and 2450 Ma enderbitic and charnockitic rocks including the Sahli Granite. Ages of ca. 2450 Ma are also common from the other two tectonic windows to the Sask Craton, suggesting that emplacement of the igneous suite was widespread and perhaps part of the coeval Matachewan Igneous Event. The absence of rocks in the > or =2960 and ca. 2450 Ma age ranges on both the adjacent Superior and Rae-Hearne cratonic margins makes it improbable that the Sask Craton was derived by simple fragmentation without large-scale tectonic transport. The overthrust Paleoproterozoic rocks represent a high-grade northwestern extension of the Flin Flon volcanic belt and include 1856 Ma leucotonalite and 1843 Ma quartz monzodiorite. An 1830 Ma suite of homogeneous, calc-alkaline enderbitic rocks, which intrude Burntwood semipelitic migmatites throughout the Kisseynew Domain, has also been emplaced in mylonites of the Pelican Decollement Zone. Zircon and monazite ages in the 1812-1803 Ma range record a high-grade metamorphic event that resulted from collision between the Sask Craton and Flin Flon-Glennie Complex.
DE: absolute-age; amphibolite-facies; Archean-; Canada-; Canadian-Shield; continental-crust; cratons-; crust-; dates-; decollement-; facies-; faults-; Flin-Flon-Belt; geochemistry-; gneisses-; granulite-facies; high-grade-metamorphism; Hudsonian-Orogeny; Jan-Lake-Complex; lithogeochemistry-; metaigneous-rocks; metamorphic-rocks; metamorphism-; migmatites-; monazite-; mylonites-; NATMAP-Shield-Margin-Project; nesosilicates-; North-America; orogeny-; orthosilicates-; overthrust-faults; Pelican-Window; phosphates-; Precambrian-; Sask-Craton; Saskatchewan-; silicates-; tectonics-; U-Pb; Western-Canada; windows-; zircon-
CC: 02C-Geochemistry-of-rocks,-soils,-and-sediments; 05A-Igneous-and-metamorphic-petrology
DT: Serial
BL: Analytic
MC: LAT: N544000; N551500; LONG: W1023000; W1031500.
NN: Lithoprobe Publ. No. 917.
IL: Refs: 63; illus. incl. 4 tables, geol. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-061532
UD: 199921

Author:
Ashton-K-E; Heaman-Larry-M; Lewry-J-F; Hartlaub-R-P; Shi-R

Title:
Age and origin of the Jan Lake Complex; a glimpse at the buried Archean craton of the Trans-Hudson Orogen.

Keywords:
absolute-age; amphibolite-facies; Archean-; Canada-; Canadian-Shield; continental-crust; cratons-; crust-; dates-; decollement-; facies-; faults-; Flin-Flon-Belt; geochemistry-; gneisses-; granulite-facies; high-grade-metamorphism; Hudsonian-Orogeny; Jan-Lake-Complex; lithogeochemistry-; metaigneous-rocks; metamorphic-rocks; metamorphism-; migmatites-; monazite-; mylonites-; NATMAP-Shield-Margin-Project; nesosilicates-; North-America; orogeny-; orthosilicates-; overthrust-faults; Pelican-Window; phosphates-; Precambrian-; Sask-Craton; Saskatchewan-; silicates-; tectonics-; U-Pb; Western-Canada; windows-; zircon-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 185-208. 1999.


Citation_Text:
TI: Magnetic properties and modelling; Lithoprobe seismic reflection line 7C, southern Kisseynew gneiss belt, Trans-Hudson Orogen.
AU: Thomas-M-D; Tanczyk-E-I
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: NATMAP Shield Margin Project, Volume 1--Le projet du bord du Bouclier NATMAP, Volume 1.
BA: Lucas-Stephen-B (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 175-183. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The Missi Suite, comprising metamorphosed, magnetite-bearing molasse deposits, runs west-northwest across the southern part of the Kisseynew Gneiss Belt in the Trans-Hudson Orogen. It flanks an internal structural boundary, north of which lies the migmatitic core of the Kisseynew Gneiss Belt, formed largely of arc-derived metasediments assigned to the Burntwood Suite. Lithoprobe reflection seismic images crossing the boundary indicate north-facing, homoclinal structures in which the Missi and Burntwood suites are structurally interlayered. The strong magnetic signature associated with the Missi Suite allows an independent assessment of the seismic models, through magnetic modelling constrained by rock magnetic properties. Along Lithoprobe line 7C, the pattern of a prominent magnetic high over the Missi Suite and a subdued magnetic field over the Burntwood Suite is reflected in values of magnetic susceptibilities, demonstrating a close link between magnetic anomalies and surface geology. Measurements of natural remanent magnetization provide an additional critical constraint for modelling. In the seismic model, gently folded north-dipping layers become progressively less steep at depth, eventually becoming subhorizontal. The magnetic model indicates that layers dip at approximately 45 degrees to a depth of about 7 km, a picture supported by steep reflectors in the seismic data themselves and in down-plunge structural modelling. It is proposed that the layers, which probably contain layer-parallel imbricate thrusts, are rooted in a subhorizontal decollement, interpreted from the seismic image, at a depth of about 10 km. The magnetic model is consistent with the presence of a ramp-like structure developed along the ancient margin of the Kisseynew basin.
DE: Canada-; Canadian-Shield; continental-crust; crust-; Flin-Flon-Belt; geophysical-methods; geophysical-profiles; geophysical-surveys; gneisses-; Hudsonian-Orogeny; Kisseynew-Complex; Lithoprobe-; magnetic-properties; magnetic-susceptibility; magnetization-; Manitoba-; metamorphic-rocks; metasedimentary-rocks; models-; NATMAP-Shield-Margin-Project; natural-remanent-magnetization; North-America; paleomagnetism-; Precambrian-; reflection-methods; remanent-magnetization; Saskatchewan-; seismic-methods; seismic-profiles; surveys-; tectonic-elements; Western-Canada
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
NN: Geol. Surv. Can., Contrib. No. 1996258.
IL: Refs: 11; illus. incl. sects., 1 table, geol. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-061531
UD: 199921

Title:
Magnetic properties and modelling; Lithoprobe seismic reflection line 7C, southern Kisseynew gneiss belt, Trans-Hudson Orogen.

Keywords:
Canada-; Canadian-Shield; continental-crust; crust-; Flin-Flon-Belt; geophysical-methods; geophysical-profiles; geophysical-surveys; gneisses-; Hudsonian-Orogeny; Kisseynew-Complex; Lithoprobe-; magnetic-properties; magnetic-susceptibility; magnetization-; Manitoba-; metamorphic-rocks; metasedimentary-rocks; models-; NATMAP-Shield-Margin-Project; natural-remanent-magnetization; North-America; paleomagnetism-; Precambrian-; reflection-methods; remanent-magnetization; Saskatchewan-; seismic-methods; seismic-profiles; surveys-; tectonic-elements; Western-Canada

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 175-183. 1999.


Citation_Text:
TI: Applications of digital methodology to the NATMAP Shield Margin Project.
AU: Broome-H-John; Viljoen-David
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: NATMAP Shield Margin Project, Volume 1--Le projet du bord du Bouclier NATMAP, Volume 1.
BA: Lucas-Stephen-B (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 161-173. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: The NATMAP Shield Margin Project, which began in 1991, straddles the Manitoba-Saskatchewan border and studied a rectangular area with east-west and north-south extents of approximately 250 and 150 km, respectively. Among the principal objectives of the NATMAP program were a compilation of a digital geoscience database for the study area and development of digital methodology to build this database and its utilization to aid in reaching the geological goals of the project. It was anticipated that these initiatives would encourage integrated interpretation of data, improve the effectiveness of the geological mapping process, and accelerate publication of results. One of the keys to effectively applying digital methods to a geological mapping project is maintaining data in digital form throughout the project, from the field through to publication. Transcription errors are eliminated and the production of both preliminary and final maps and digital products is accelerated. Access to digital data also facilitates application of digital tools for analysis and visualization. Integrated image products generated from geophysical and geological data sets were used throughout the project and assisted in development of geological models and their visualization. Three-dimensional visualization methods were used to combine NATMAP surface and subsurface mapping with Lithoprobe interpretations of seismic reflection data. The digital database was used to prepare a digital archive of the project which will be published in CD-ROM after completion of the project.
DE: bedrock-; Canada-; Canadian-Shield; cartography-; color-imagery; data-acquisition; data-bases; data-processing; digitization-; Flin-Flon-Belt; imagery-; Manitoba-; mapping-; NATMAP-Shield-Margin-Project; North-America; programs-; Saskatchewan-; three-dimensional-models; visualization-; Western-Canada
CC: 14-Geologic-maps
DT: Serial
BL: Analytic
IL: Refs: 35; illus. incl. 1 table, sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-061530
UD: 199921

Title:
Applications of digital methodology to the NATMAP Shield Margin Project.

Keywords:
bedrock-; Canada-; Canadian-Shield; cartography-; color-imagery; data-acquisition; data-bases; data-processing; digitization-; Flin-Flon-Belt; imagery-; Manitoba-; mapping-; NATMAP-Shield-Margin-Project; North-America; programs-; Saskatchewan-; three-dimensional-models; visualization-; Western-Canada

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 161-173. 1999.


Citation_Text:
TI: New perspectives on the Flin Flon Belt, Trans-Hudson Orogen, Manitoba and Saskatchewan; an introduction to the special issue on the NATMAP Shield Margin Project; Part 1.
AU: Lucas-Stephen-B; Syme-Eric-C; Ashton-K-E
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: NATMAP Shield Margin Project, Volume 1--Le projet du bord du Bouclier NATMAP, Volume 1.
BA: Lucas-Stephen-B (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 135-140. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: A new tectonic framework for the Flin Flon Belt in southeastern Reindeer Zone of the Trans-Hudson Orogen has emerged in recent years through four-dimensional studies (bedrock and subsurface mapping, seismic reflection profiling, U-Pb geochronology) associated with the NATMAP Shield Margin Project and Lithoprobe Trans-Hudson Orogen Transect. This special issue contains 10 papers covering a wide variety of topics related to the NATMAP Shield Margin Project.
DE: Canada-; Canadian-Shield; continental-crust; crust-; Flin-Flon-Belt; Hudsonian-Orogeny; Manitoba-; NATMAP-Shield-Margin-Project; North-America; Precambrian-; programs-; Reindeer-Zone; Saskatchewan-; shields-; tectonics-; Western-Canada
CC: 16-Structural-geology
DT: Serial
BL: Analytic
IL: Refs: 29; geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-061528
UD: 199921

Title:
New perspectives on the Flin Flon Belt, Trans-Hudson Orogen, Manitoba and Saskatchewan; an introduction to the special issue on the NATMAP Shield Margin Project; Part 1.

Keywords:
Canada-; Canadian-Shield; continental-crust; crust-; Flin-Flon-Belt; Hudsonian-Orogeny; Manitoba-; NATMAP-Shield-Margin-Project; North-America; Precambrian-; programs-; Reindeer-Zone; Saskatchewan-; shields-; tectonics-; Western-Canada

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 36; 2, Pages 135-140. 1999.


Citation_Text:
TI: The gravity field over the Ungava Bay region from satellite altimetry and new land-based data; implications for the geology of the area.
AU: Telmat-Hamid; Mareschal-Jean-Claude; Gariepy-Clement
AF: Universite du Quebec a Montreal, Centre de Recherche en Geochimie Isotopique et en Geochronologie, Montreal, PQ, Canada
SO: Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 36; 1, Pages 75-89. 1999.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: Gravity data were obtained along two transects on the southern coast of Ungava Bay, which provide continuous gravity coverage between Leaf Bay and George River. The transects and the derived gravity profiles extend from the Superior craton to the Rae Province across the New Quebec Orogen (NQO). Interpretation of the transect along the southwestern coast of Ungava Bay suggests crustal thickening beneath the NQO and crustal thinning beneath the Kuujjuaq Terrane, east of the NQO. Two alternative interpretations are proposed for the transect along the southeastern coast of the bay. The first model shows crustal thickening beneath the George River Shear Zone (GRSZ) and two shallow bodies correlated with the northern extensions of the GRSZ and the De Pas batholith. The second model shows constant crustal thickness and bodies more deeply rooted than in the first model. The gravity models are consistent with the easterly dipping reflections imaged along a Lithoprobe seismic line crossing Ungava Bay and suggest westward thrusting of the Rae Province over the NQO. Because no gravity data have been collected in Ungava Bay, satellite altimetry data have been used as a means to fill the gap in data collected at sea. The satellite-derived gravity data and standard Bouguer gravity data were combined in a composite map for the Ungava Bay region. The new land-based gravity measurements were used to verify and calibrate the satellite data and to ensure that offshore gravity anomalies merge with those determined by the land surveys in a reasonable fashion. Three parallel east-west gravity profiles were extracted: across Ungava Bay (59.9 degrees N), on the southern shore of the bay (58.5 degrees N), and onshore approximately 200 km south of Ungava Bay (57.1 degrees N). The gravity signature of some major structures, such as the GRSZ, can be identified on each profile.
DE: altimetry-; Atlantic-Ocean; Bouguer-anomalies; Canada-; Canadian-Shield; Churchill-Province; crust-; crustal-thickening; crustal-thinning; Eastern-Canada; geophysical-profiles; geophysical-surveys; gravity-anomalies; gravity-field; gravity-profiles; Lithoprobe-; mapping-; North-America; North-Atlantic; Quebec-; Rae-Province; remote-sensing; satellite-methods; spatial-variations; surveys-; Ungava-; Ungava-Bay
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 1036.
IL: Refs: 30; illus. incl. geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-061491
UD: 199921

Title:
The gravity field over the Ungava Bay region from satellite altimetry and new land-based data; implications for the geology of the area.

Keywords:
altimetry-; Atlantic-Ocean; Bouguer-anomalies; Canada-; Canadian-Shield; Churchill-Province; crust-; crustal-thickening; crustal-thinning; Eastern-Canada; geophysical-profiles; geophysical-surveys; gravity-anomalies; gravity-field; gravity-profiles; Lithoprobe-; mapping-; North-America; North-Atlantic; Quebec-; Rae-Province; remote-sensing; satellite-methods; spatial-variations; surveys-; Ungava-; Ungava-Bay

Issue:
Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 36; 1, Pages 75-89. 1999.


Citation_Text:
TI: Seismic velocity models and depth migration imaging of the Alberta basement.
AU: Burianyk-M-J-A; Bouzidi-Y; Phadke-S; Kanasewich-E-R
AF: University of Alberta, Department of Physics, Edmonton, AB, Canada
BK: In: AGU 1997 fall meeting.
BA: Anonymous
SO: Eos, Transactions, American Geophysical Union. 78; 46, Suppl., Pages 470. 1997.
PB: American Geophysical Union. Washington, DC, United States. 1997.
CP: United-States
PY: 1997
CN: American Geophysical Union, 1997 fall meeting. San Francisco, CA, United States. Dec. 8-12, 1997.
LA: English
DE: Alberta-; arrival-time; basement-; body-waves; Canada-; continental-crust; crust-; data-processing; depth-; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; Hearne-Province; iterative-methods; Lithoprobe-; P-waves; parallel-processing; poststack-migration; SAREX-; seismic-methods; seismic-migration; seismic-profiles; seismic-waves; southeastern-Alberta; surveys-; velocity-structure; Western-Canada
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0096-3941
CO: EOSTAJ
AN: 1999-056020
UD: 199919

Title:
Seismic velocity models and depth migration imaging of the Alberta basement.

Keywords:
Alberta-; arrival-time; basement-; body-waves; Canada-; continental-crust; crust-; data-processing; depth-; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; Hearne-Province; iterative-methods; Lithoprobe-; P-waves; parallel-processing; poststack-migration; SAREX-; seismic-methods; seismic-migration; seismic-profiles; seismic-waves; southeastern-Alberta; surveys-; velocity-structure; Western-Canada

Issue:
Eos, Transactions, American Geophysical Union. 78; 46, Suppl., Pages 470. 1997.

Publisher:
American Geophysical Union. Washington, DC, United States. 1997.


Citation_Text:
TI: Seismic studies across the Southern Province.
AU: Milkereit-Bernd
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: The northern margin of the Southern Province of the Canadian Shield; program and abstracts.
BA: Anonymous
SO: The Canadian Mineralogist. 33, Part 4; Pages 926-927. 1995.
PB: Mineralogical Association of Canada. Ottawa, ON, Canada. 1995.
CP: Canada
PY: 1995
CN: The northern margin of the Southern Province of the Canadian Shield. Sudbury, ON, Canada. Sept. 29-Oct. 1, 1995.
LA: English
DE: Canadian-Shield; data-bases; data-processing; geophysical-methods; geophysical-profiles; geophysical-surveys; igneous-rocks; Lithoprobe-; North-America; Precambrian-; Proterozoic-; reflection-methods; seismic-methods; seismic-profiles; Southern-Province; surveys-; upper-Precambrian
CC: 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
IL: Refs: 6
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4476
CO: CAMIA6
AN: 1999-051776
UD: 199918

Title:
Seismic studies across the Southern Province.

Keywords:
Canadian-Shield; data-bases; data-processing; geophysical-methods; geophysical-profiles; geophysical-surveys; igneous-rocks; Lithoprobe-; North-America; Precambrian-; Proterozoic-; reflection-methods; seismic-methods; seismic-profiles; Southern-Province; surveys-; upper-Precambrian

Issue:
The Canadian Mineralogist. 33, Part 4; Pages 926-927. 1995.

Publisher:
Mineralogical Association of Canada. Ottawa, ON, Canada. 1995.


Citation_Text:
TI: Crustal seismic velocity and density structure of the Intermontane and Coast belts, southwestern Cordillera.
AU: Spence-George-D; McLean-Nancy-A
AF: University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada
SO: Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 35; 12, Pages 1362-1379. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: Seismic refraction--wide-angle reflection data were recorded along a 450 km profile across the Intermontane, Coast, and Insular belts of the Canadian Cordillera. Crust and upper mantle structure was interpreted from traveltime inversion and forward-amplitude modelling, and the resultant seismic velocities were used to constrain modelling of the Bouguer gravity data along the profile. A high-velocity, high-density block in the upper 8 km of crust was interpreted as the subsurface extension of Harrison terrane; the Harrison fault at its eastern boundary may extend to at least 8 km depth and perhaps 20 km. Throughout the crust, both seismic velocities and densities are in general high beneath the Insular belt, low beneath the Coast and western Intermontane belts, and intermediate beneath the eastern Intermontane belt. However, densities are unusually low in the lower crust beneath the Coast belt (2800 kg/m (super 3) ), relative to velocities (6.6-6.8 km/s). This indicates that Coast belt plutonic material is present throughout the crust; strong upper mantle reflectivity, previously interpreted on a Lithoprobe reflection line beneath the western Coast belt, may be high-density residue associated with the unusually low density plutonic material. Based on gravity data, Wrangellia must terminate sharply against the western edge of the Coast belt. In the lower crust, the lowest seismic velocities are found vertically beneath the surface trace of the Fraser fault, where velocities just above the Moho only reach 6.5 km/s, in contrast with 6.8 km/s beneath the western Coast belt and eastern Intermontane belt. This provides support for a subvertical geometry for the Fraser fault, perhaps with a broad zone of diffuse shearing in the lower crust. At this location, the Fraser fault does not appear to vertically offset the Moho, which is well-constrained at a uniform depth of approximately 34 km east of the Harrison fault.
DE: British-Columbia; Canada-; Canadian-Cordillera; Coast-Belt; crust-; deep-seated-structures; density-; faults-; Fraser-River-Fault; geophysical-methods; geophysical-profiles; gravity-anomalies; Harrison-Fault; Intermontane-Belt; inverse-problem; Lithoprobe-; Mohorovicic-discontinuity; North-America; North-American-Cordillera; reflection-methods; refraction-methods; seismic-methods; seismic-profiles; seismograms-; southern-British-Columbia; suture-zones; synthetic-seismograms; terranes-; velocity-structure; Western-Canada; Wrangellia-
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 951.
IL: Refs: 50; illus. incl. sects., 2 tables, geol. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-049611
UD: 199917

Title:
Crustal seismic velocity and density structure of the Intermontane and Coast belts, southwestern Cordillera.

Keywords:
British-Columbia; Canada-; Canadian-Cordillera; Coast-Belt; crust-; deep-seated-structures; density-; faults-; Fraser-River-Fault; geophysical-methods; geophysical-profiles; gravity-anomalies; Harrison-Fault; Intermontane-Belt; inverse-problem; Lithoprobe-; Mohorovicic-discontinuity; North-America; North-American-Cordillera; reflection-methods; refraction-methods; seismic-methods; seismic-profiles; seismograms-; southern-British-Columbia; suture-zones; synthetic-seismograms; terranes-; velocity-structure; Western-Canada; Wrangellia-

Issue:
Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 35; 12, Pages 1362-1379. 1998.

Publisher:
National Research Council of Canada. Ottawa, ON, Canada. 1998.


Citation_Text:
TI: Continental collision including a weak zone; the vise model and its application to the Newfoundland Appalachians.
AU: Ellis-Susan; Beaumont-Christopher; Jamieson-Rebbeca-A; Quinlan-Garry
AF: Dalhousie University, Department of Oceanography, Halifax, NS, Canada
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1323-1346. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: Continental collision generally occurs after a protracted history of rifting, sedimentation, and subduction. Inherited material heterogeneities and thermal effects from terrane accretion and amalgamation may control subsequent collisional deformation. Such strength contrasts may have played an important role in the Silurian evolution of the Newfoundland Appalachians. A cross-sectional plane-strain numerical model is used to investigate the effect of a weak zone embedded between stronger model crust (the "vise") on the deformation style of orogens. In contrast to collision of uniform strong crust in which deformation is directly related to the underlying subduction of mantle lithosphere, deformation in vise models can propagate out to the ends of the vise in a diffuse manner. This distributed tectonic style depends on the relative strength of the embedded weak zone, the degree of coupling of this zone to underlying layers, and the effect of gravity acting on thickened crust. For weak coupling at the base of the crust, results are insensitive to the behaviour of the underlying model mantle (e.g., subduction, subduction retreat, or pure-shear thickening). Vise model results are in first-order agreement with the following characteristics of Newfoundland Silurian tectonics: (i) a diffuse deformation style distributed over a weak core zone more than 100 km wide, (ii) lack of indirect evidence of mantle dynamics from crustal reflectivity fabric, and (iii) lack of clear evidence for significant crustal thickening during orogeny.
DE: Appalachians-; Canada-; continental-margin; cross-sections; crust-; deformation-; Eastern-Canada; Lithoprobe-; lithosphere-; mechanical-properties; mechanism-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; numerical-models; orogenic-belts; Paleozoic-; plate-collision; plate-tectonics; Silurian-; strain-; strength-; tectonics-; theoretical-models; vise-model
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
NN: Includes appendix; Lithoprobe Publ. No. 833.
IL: Refs: 54; illus. incl. sects., 1 table, sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045761
UD: 199916

Title:
Continental collision including a weak zone; the vise model and its application to the Newfoundland Appalachians.

Keywords:
Appalachians-; Canada-; continental-margin; cross-sections; crust-; deformation-; Eastern-Canada; Lithoprobe-; lithosphere-; mechanical-properties; mechanism-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; numerical-models; orogenic-belts; Paleozoic-; plate-collision; plate-tectonics; Silurian-; strain-; strength-; tectonics-; theoretical-models; vise-model

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1323-1346. 1998.


Citation_Text:
TI: Thermal maturity and burial history of Paleozoic rocks in western Newfoundland.
AU: Williams-S-Henry; Burden-Elliott-T; Mukhopadhyay-P-K
AF: Memorial University of Newfoundland, Department of Earth Sciences, Saint John's, NF, United States
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1307-1322. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: Palynomorphs and graptolites from Paleozoic strata in western Newfoundland are examined and correlated with previously published data to identify fossils which are characteristic of proven and suspected source rocks. Measurements of colour alteration of acritarchs and spores (acritarch alteration index and thermal alteration index), random graptolite reflectance, and vitrinite reflectance are applied to determine regional thermal maturation and burial history. General trends of increasing maturity from south to north along the Northern Peninsula and from west to east across the Port au Port Peninsula are observed. Within these general trends, a more detailed distribution of thermal maturities can be recognized. In the south, Upper Ordovician rocks of the Long Point Group, western Port au Port Peninsula, exhibit the lowest maturity values found in western Newfoundland and are considered immature or marginally mature. Middle Ordovician rocks of the Goose Tickle and Table Head groups and the Lower Ordovician St. George Group are marginally mature. Cambrian strata on the Port au Port Peninsula are mature. Maturation levels increase to the east; Goose Tickle Group black shales in the vicinity of Black Cove, east of Port au Port, are mature. Equivalent sediments extending for another 15-20 km to the east lie within the oil window. Beyond that area, the equivalent rocks are overmature. The best potential source rocks belonging to the allochthonous Cow Head Group contain abundant acritarchs and Gloeocapsamorpha sp. These rocks are marginally mature to mature within Gros Morne National Park; maturation levels increase farther north (e.g., Parsons Pond), becoming overmature somewhere south of Port au Choix. It is concluded that neither the allochthonous Ordovician rocks presently exposed in Gros Morne nor the autochthonous strata exposed on the Port au Port Peninsula have ever been covered by significant thicknesses of overburden (probably 3 km or less), either in the form of structural slices or other sedimentary units since their original deposition.
DE: acritarchs-; allochthons-; Appalachians-; autochthons-; black-shale; burial-; burial-metamorphism; Canada-; clastic-rocks; color-alteration-index; correlation-; Cow-Head-Group; Eastern-Canada; Goose-Tickle-Group; Graptolithina-; index-fossils; Lithoprobe-; Long-Point-Group; macerals-; metamorphic-rocks; metamorphism-; metasedimentary-rocks; microfossils-; Middle-Ordovician; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; Ordovician-; Paleozoic-; palynomorphs-; petroleum-; petroleum-exploration; Port-au-Port-Peninsula; reflectance-; sedimentary-rocks; source-rocks; spores-; Table-Head-Group; thermal-alteration; thermal-maturity; vitrinite-; western-Newfoundland
CC: 29A-Economic-geology,-geology-of-energy-sources; 05A-Igneous-and-metamorphic-petrology
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 1017.
IL: Refs: 61; illus. incl. strat. cols., 1 table, geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045760
UD: 199916

Title:
Thermal maturity and burial history of Paleozoic rocks in western Newfoundland.

Keywords:
acritarchs-; allochthons-; Appalachians-; autochthons-; black-shale; burial-; burial-metamorphism; Canada-; clastic-rocks; color-alteration-index; correlation-; Cow-Head-Group; Eastern-Canada; Goose-Tickle-Group; Graptolithina-; index-fossils; Lithoprobe-; Long-Point-Group; macerals-; metamorphic-rocks; metamorphism-; metasedimentary-rocks; microfossils-; Middle-Ordovician; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; Ordovician-; Paleozoic-; palynomorphs-; petroleum-; petroleum-exploration; Port-au-Port-Peninsula; reflectance-; sedimentary-rocks; source-rocks; spores-; Table-Head-Group; thermal-alteration; thermal-maturity; vitrinite-; western-Newfoundland

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1307-1322. 1998.


Citation_Text:
TI: Deformation styles at the Appalachian structural front, western Newfoundland; implications of new industry seismic reflection data.
AU: Stockmal-Glen-S; Slingsby-Art; Waldron-John-W-F
AF: Geological Survey of Canada, Calgary, AB, Canada
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1288-1306. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: New seismic reflection data gathered during hydrocarbon exploration in and adjacent to the external Humber zone, western Newfoundland, have important implications for the interpretation of structural style at the Appalachian front. These new data indicate that the structural front is influenced by both thin-skinned and thick-skinned structures. Where the structural front is thin skinned, it is characterized by a triangle zone, or tectonic wedge, similar to structures observed at the southeastern margin of the Canadian Cordillera, and at other orogenic fronts. The thin-skinned tectonic wedge is overridden locally by thick-skinned thrusts, which are generally emergent but are locally blind, forming a thick-skinned tectonic wedge. Timing relationships indicate that, although initial motion occurred during the Early to Middle Ordovician Taconian orogeny, the thin-skinned allochthonous slices in western Newfoundland were not emplaced until Devonian time (the Acadian orogeny). Thick-skinned deformation, which postdates thin-skinned thrusting, probably occurred between Middle Devonian and earliest Carboniferous time.
DE: Acadian-Phase; Appalachians-; Canada-; continental-margin; cross-sections; Devonian-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; Humber-Zone; Lithoprobe-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; Paleozoic-; reflection-methods; seismic-methods; seismic-profiles; surveys-; tectonic-wedges; tectonics-; thick-skinned-tectonics; thin-skinned-tectonics; upper-Paleozoic; western-Newfoundland
CC: 16-Structural-geology; 20-Applied-geophysics
DT: Serial
BL: Analytic
MC: LAT: N483000; N503000; LONG: W0571500; W0592000.
NN: Lithoprobe Publ. No. 1007; Geol. Surv. Can., Contrib. No. 1997167.
IL: Refs: 35; sects., strat. col., geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045759
UD: 199916

Title:
Deformation styles at the Appalachian structural front, western Newfoundland; implications of new industry seismic reflection data.

Keywords:
Acadian-Phase; Appalachians-; Canada-; continental-margin; cross-sections; Devonian-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; Humber-Zone; Lithoprobe-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; Paleozoic-; reflection-methods; seismic-methods; seismic-profiles; surveys-; tectonic-wedges; tectonics-; thick-skinned-tectonics; thin-skinned-tectonics; upper-Paleozoic; western-Newfoundland

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1288-1306. 1998.


Citation_Text:
TI: Evolution of the Appalachian Laurentian margin; Lithoprobe results in western Newfoundland.
AU: Waldron-John-W-F; Anderson-Scott-D; Cawood-Peter-A; Goodwin-Laurel-B; Hall-Jeremy; Jamieson-Rebecca-A; Palmer-Sarah-E; Stockmal-Glen-S; Williams-Paul-F
AF: Saint Mary's University, Geology Department, Halifax, NS, Canada
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1271-1287. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: The Humber Zone of the western Newfoundland Appalachians represents the early Paleozoic Laurentian margin established by Neoproterozoic rifting. After a period of passive margin thermal subsidence, Taconian deformation began in the Early Ordovician with westward thrusting. Subsequently, an extensive foreland basin developed beneath the Gulf of St. Lawrence. It records rapid Late Ordovician to Early Silurian subsidence; mid-Silurian erosion; and renewed Late Silurian to Devonian subsidence. The Humber Zone was traversed by Lithoprobe seismic reflection profiles. Within the external part of the orogen, seismic reflections in the upper crustal section appear more coherent where seismic lines are parallel to fold hinges. Some subhorizontal reflectors are interpreted as thrust sheets of shelf limestone, but others probably represent intrabasement structures. A group of moderately northwest-dipping reflections probably represents late extensional shear zones. On the Baie Verte Peninsula, low-angle reflections passing beneath the Baie Verte Line are probably also late extensional shears, possibly reactivating earlier thrusts. Tectonism in the Humber Zone probably began with attempted eastward subduction of the Laurentian margin. Deep burial of the margin, accompanied by eclogite-facies metamorphism, probably coincided with rapid subsidence in the foreland basin. Later Barrovian metamorphism was associated with cleavage development and east-directed shear, and with dextral oblique slip, in Baie Verte Peninsula. Later Silurian sinistral transpression with thrusting east of the Baie Verte Line was followed by dextral transpression to transtension. "Acadian" thrusting dominated the western margin of the orogen in the Devonian and possibly earliest Carboniferyous.
DE: Acadian-Phase; Appalachians-; Baie-Verte-Peninsula; Canada-; continental-margin; cross-sections; crust-; Devonian-; Dunnage-Zone; Eastern-Canada; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Humber-Arm-Allochthon; Humber-Zone; kinematics-; Laurentia-; Lithoprobe-; lower-Paleozoic; metamorphic-rocks; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; orogeny-; paleogeography-; Paleozoic-; reflection-methods; seismic-methods; seismic-profiles; shear-zones; surveys-; Taconic-Orogeny; tectonics-; western-Newfoundland
CC: 16-Structural-geology; 20-Applied-geophysics
DT: Serial
BL: Analytic
MC: LAT: N483000; N503000; LONG: W0573000; W0590000.
NN: Lithoprobe Publ. No. 913; Geol. Surv. Can., Contrib. No. 1997292; Tectonics Spec. Res. Cent.., Publ. No. 13.
IL: Refs: 106; illus. incl. block diags., chart, sects., geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045758
UD: 199916

Author:
Waldron-John-W-F; Anderson-Scott-D; Cawood-Peter-A; Goodwin-Laurel-B; Hall-Jeremy; Jamieson-Rebecca-A; Palmer-Sarah-E; Stockmal-Glen-S; Williams-Paul-F

Title:
Evolution of the Appalachian Laurentian margin; Lithoprobe results in western Newfoundland.

Keywords:
Acadian-Phase; Appalachians-; Baie-Verte-Peninsula; Canada-; continental-margin; cross-sections; crust-; Devonian-; Dunnage-Zone; Eastern-Canada; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Humber-Arm-Allochthon; Humber-Zone; kinematics-; Laurentia-; Lithoprobe-; lower-Paleozoic; metamorphic-rocks; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; orogeny-; paleogeography-; Paleozoic-; reflection-methods; seismic-methods; seismic-profiles; shear-zones; surveys-; Taconic-Orogeny; tectonics-; western-Newfoundland

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1271-1287. 1998.


Citation_Text:
TI: Geological correlations between Cape Breton Island and Newfoundland, northern Appalachian Orogen.
AU: Barr-S-M; Raeside-R-P; White-C-E
AF: Acadia University, Department of Geology, Wolfville, NS, Canada
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1252-1270. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: Geological correlations between Cape Breton Island and Newfoundland are apparent both in surface geology and at deeper crustal levels, based on similarities in Sm-Nd isotopic signatures. The Mira terrane of southeastern Cape Breton Island is part of the Avalon terrane sensu stricto and is composed of Neoproterozoic volcanic-sedimentary-plutonic belts and overlying Cambrian rocks directly comparable to those in the western part of the Newfoundland Avalon terrane. The Bras d'Or terrane is also mainly of Neoproterozoic age, but shows lithological and isotopic contrasts with the Mira terrane. Small areas of similar Neoproterozoic rocks occur in southern Newfoundland and to the north as inliers in the Exploits terrane. The Bras d'Or terrane and similar rocks in Newfoundland are interpreted to represent a peri-Gondwanan terrane where rocks of the Gander terrane were later formed. Hence this area is part of the Central Mobile Belt and distinct from Avalon terrane sensu stricto. The Aspy terrane is a complex area that may include fragments of Bras d'Or crust and components of the Gander, Exploits, and possibly Notre Dame terranes of Newfoundland. It formed by subduction and back-arc basin opening and closure during the Silurian to Early Devonian. The Blair River Inlier is a fragment of Grenvillian rocks, similar to those in the Grenvillian inliers in the Humber zone of western Newfoundland in terms of age, rock types, and isotopic composition. Silurian and Devonian promontory-promontory collision resulted in juxtaposition and stacking of these elements in Cape Breton Island, as in the Hermitage Flexure-Port aux Basques area of Newfoundland. Because the lower crust under Bras d'Or-Gander-Aspy terranes seems distinct from that under Avalon terrane sensu stricto, it is preferable to use the term peri-Gondwanan rather than Avalonian to refer to these areas.
DE: Appalachians-; Aspy-Terrane; Avalon-Zone; Blair-River-Inlier; Bras-d'-Or-Terrane; Canada-; Cape-Breton-Island; correlation-; Eastern-Canada; geochemistry-; igneous-rocks; isotope-ratios; isotopes-; lithogeochemistry-; Lithoprobe-; Maritime-Provinces; metals-; Mira-Terrane; mobile-belts; Nd-144-Nd-143; neodymium-; Neoproterozoic-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; Nova-Scotia; orogenic-belts; Precambrian-; Proterozoic-; radioactive-isotopes; rare-earths; samarium-; Sm-147-Nd-144; stable-isotopes; terranes-; upper-Precambrian
CC: 12-Stratigraphy; 02C-Geochemistry-of-rocks,-soils,-and-sediments
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 1014.
IL: Refs: 97; illus. incl. sects., 1 table, geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045757
UD: 199916

Title:
Geological correlations between Cape Breton Island and Newfoundland, northern Appalachian Orogen.

Keywords:
Appalachians-; Aspy-Terrane; Avalon-Zone; Blair-River-Inlier; Bras-d'-Or-Terrane; Canada-; Cape-Breton-Island; correlation-; Eastern-Canada; geochemistry-; igneous-rocks; isotope-ratios; isotopes-; lithogeochemistry-; Lithoprobe-; Maritime-Provinces; metals-; Mira-Terrane; mobile-belts; Nd-144-Nd-143; neodymium-; Neoproterozoic-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; Nova-Scotia; orogenic-belts; Precambrian-; Proterozoic-; radioactive-isotopes; rare-earths; samarium-; Sm-147-Nd-144; stable-isotopes; terranes-; upper-Precambrian

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1252-1270. 1998.


Citation_Text:
TI: An improved velocity model for the crust and upper mantle along the central mobile belt of the Newfoundland Appalachian Orogen and its offshore extension.
AU: Chian-Deping; Marillier-Francois; Hall-Jeremy; Quinlan-Garry
AF: Dalhousie University, Department of Oceanography, Halifax, NS, Canada
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1238-1251. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: New modelling of wide-angle reflection-refraction data of the Canadian Lithoprobe East profile 91-1 along the central mobile belt of the Newfoundland Appalachian orogen reveals new features of the upper mantle, and establishes links in the crust and upper mantle between existing land and marine wide-angle data sets by combining onshore-offshore recordings. The revised model provides detailed velocity structure in the 30-34 km thick crust and the top 30 km of upper mantle. The lower crust is characterized by a velocity of 6.6-6.8 km/s onshore, increasing by 0.2 km/s to the northeast offshore beneath the sedimentary basins. This seaward increase in velocity may be caused by intrusion of about 4 km of basic rocks into the lower crust during the extension that formed the overlying Carboniferous basins. The Moho is found at 34 km depth onshore, rising to 30 km offshore to the northeast with a local minimum of 27 km. The data confirm the absence of deep crustal roots under the central mobile belt of Newfoundland. Our long-range (up to 450 km offset) wide-angle data define a bulk velocity of 8.1-8.3 km/s within the upper approximately 20 km of mantle. The data also contain strong reflective phases that can be correlated with two prominent mantle reflectors. The upper reflector is found at approximately 50 km depth under central Newfoundland, rising abruptly towards to northeast where it reaches a minimum depth of 36 km. This reflector is associated with a thin layer (1-2 km) unlikely to coincide with a discontinuity with a large cross-boundary change in velocity. The lower reflector at 55-65 km depths is much stronger, and may have similar origins to reflections observed below the Appalachians in the Canadian Maritimes which are associated with a velocity increase to 8.5 km/s. Our data are insufficient for discriminating among various interpretations for the origins of these mantle reflectors.
DE: Appalachians-; Atlantic-Ocean; Canada-; crust-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; Gulf-of-Saint-Lawrence; Lithoprobe-; lower-crust; mantle-; mobile-belts; Mohorovicic-discontinuity; Newfoundland-; Newfoundland-Island; North-America; North-Atlantic; Northern-Appalachians; orogenic-belts; reflection-methods; refraction-methods; seismic-methods; seismic-profiles; surveys-; tectonics-; upper-mantle; velocity-structure
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 922.
IL: Refs: 31; illus. incl. sects., sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045756
UD: 199916

Title:
An improved velocity model for the crust and upper mantle along the central mobile belt of the Newfoundland Appalachian Orogen and its offshore extension.

Keywords:
Appalachians-; Atlantic-Ocean; Canada-; crust-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; Gulf-of-Saint-Lawrence; Lithoprobe-; lower-crust; mantle-; mobile-belts; Mohorovicic-discontinuity; Newfoundland-; Newfoundland-Island; North-America; North-Atlantic; Northern-Appalachians; orogenic-belts; reflection-methods; refraction-methods; seismic-methods; seismic-profiles; surveys-; tectonics-; upper-mantle; velocity-structure

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1238-1251. 1998.


Citation_Text:
TI: Seismic refraction data in the Gulf of Saint Lawrence; implications for the lower-crustal blocks.
AU: Jackson-H-R; Marillier-Francois; Hall-Jeremy
AF: Geological Survey of Canada (Atlantic), Dartmouth, NS, United States
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1222-1237. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: A refined model for the wide-angle reflection-refraction profile 88-3 that crosses the foreland basin of the Appalachian orogen is presented. The two major layers of the cratonic crust have velocities of 6.2 and 6.7 km.s (super -1) with low gradients. Near the exposed North American craton, the 6.7 km.s (super -1) velocity appears at the shallow depth of 13 km and the M discontinuity at greater than 40 km depth. Towards the orogen, a southeastward-dipping ramp is developed at mid-crustal levels at the top of the 6.7 km.s (super -1) layer. Near the Appalachian Front lower-crustal velocities typical of the Grenville are replaced with a velocity of 7.2 km.s (super -1) . The collinear reflection profile confirms the southward-dipping ramp, the shallowing M discontinuity, and the lateral changes in the lower crust. Refraction profiles combined with reflection and gravity data are used to distinguish the Grenville lower-crustal block. The Grenville lower-crustal block is defined as a pattern of lower-crustal and upper-mantle reflectivity, with associated velocities, and a more negative gravity anomaly than lower-crustal blocks of the Appalachian terranes. The Grenville block terminates northwest of the coast of Newfoundland near the Appalachian Front. Thus, this lower-crustal province does not underlie the Humber tectono-stratigraphic zone. This is different than the relationship of the edge of the Grenville lower-crustal block to surface zones in New England. A thick-skinned tectonic style with basement-involved deformation appears to be typical of the Newfoundland Appalachians; in contrast, a thin-skinned structural style is observed in New England. The change in structural styles occurs in the bend of the Appalachian orogen across the Gulf of St. Lawrence.
DE: Appalachians-; Atlantic-Ocean; block-structures; Bouguer-anomalies; Canada-; Canadian-Shield; cratons-; crust-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; gravity-anomalies; Grenville-Province; Gulf-of-Saint-Lawrence; Lithoprobe-; lower-crust; Newfoundland-; Newfoundland-Island; North-America; North-Atlantic; Northern-Appalachians; refraction-methods; seismic-methods; seismic-profiles; surveys-; tectonics-; thick-skinned-tectonics; velocity-structure
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 924; Geol. Surv. Can., Contrib. No. 1997069.
IL: Refs: 33; illus. incl. sects., sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045755
UD: 199916

Title:
Seismic refraction data in the Gulf of Saint Lawrence; implications for the lower-crustal blocks.

Keywords:
Appalachians-; Atlantic-Ocean; block-structures; Bouguer-anomalies; Canada-; Canadian-Shield; cratons-; crust-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; gravity-anomalies; Grenville-Province; Gulf-of-Saint-Lawrence; Lithoprobe-; lower-crust; Newfoundland-; Newfoundland-Island; North-America; North-Atlantic; Northern-Appalachians; refraction-methods; seismic-methods; seismic-profiles; surveys-; tectonics-; thick-skinned-tectonics; velocity-structure

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1222-1237. 1998.


Citation_Text:
TI: Geophysical studies of the structure of the Appalachaian Orogen in the Atlantic borderlands of Canada.
AU: Hall-Jeremy; Marillier-Francois; Dehler-Sonya
AF: Memorial University of Newfoundland, Department of Earth Sciences, Saint John's, NF, Canada
BK: In: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1205-1221. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: Results of 6000 km of crustal seismic profiling are presented with gravity and aeromagnetic maps for the Appalachian orogen in eastern Canada. Wide-angle seismic surveys show that the central mobile belt of the orogen has a thinner crust than its margins. High-velocity lower crust, attributed to underplating, is found below the former Laurentian continental margin in Newfoundland and below the Magdalen basin. Potential field data are used to trace the surface zones of the orogen from the northeast Newfoundland shelf to Cape Breton, but extrapolation to New Brunswick and Quebec is unclear because of late Paleozoic basin development. The central mobile belt of the orogen is only a few tens of kilometres wide in southwest Newfoundland and Cape Breton, but broadens substantially to around 200 km elsewhere. Reflection images show a strong deep-crustal fabric that runs along the orogen, with a margin that crosses into the Avalon zone in southern Newfoundland but coincides with the Avalon-Gander zone boundary elsewhere. The fabric formed during mid-Silurian continental collision and (or) during postorogenic collapse. Variation in fabric pattern and metamorphic grade, tightening of structures towards southwest Newfoundland and Cape Breton, and voluminous plutonism in southern Newfoundland are all in accord with maximal crustal thickening followed by erosion and isostatic readjustment in southwest Newfoundland and Cape Breton, and relatively little in northeast Newfoundland and its adjacent shelf. Reflection fabrics in the upper crust appear to be detached from those in the deeper crust; this is attributed to rheological contrast across the base of a quartz-rich upper crust.
DE: Appalachians-; Atlantic-Ocean; Canada-; Cape-Breton-Island; continental-margin; continental-shelf; cross-sections; crust-; crustal-thickening; Eastern-Canada; Gaspe-Peninsula; geophysical-methods; geophysical-profiles; geophysical-surveys; Gulf-of-Saint-Lawrence; isostatic-compensation; Lithoprobe-; Maritime-Provinces; mobile-belts; New-Brunswick; Newfoundland-; Newfoundland-Island; North-America; North-Atlantic; Northern-Appalachians; Nova-Scotia; orogenic-belts; Quebec-; reflection-methods; refraction-methods; seismic-methods; seismic-profiles; surveys-; tectonics-
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 947; Geol. Surv. Can., Contrib. No. 1998027.
IL: Refs: 58; illus. incl. sects., sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045754
UD: 199916

Title:
Geophysical studies of the structure of the Appalachaian Orogen in the Atlantic borderlands of Canada.

Keywords:
Appalachians-; Atlantic-Ocean; Canada-; Cape-Breton-Island; continental-margin; continental-shelf; cross-sections; crust-; crustal-thickening; Eastern-Canada; Gaspe-Peninsula; geophysical-methods; geophysical-profiles; geophysical-surveys; Gulf-of-Saint-Lawrence; isostatic-compensation; Lithoprobe-; Maritime-Provinces; mobile-belts; New-Brunswick; Newfoundland-; Newfoundland-Island; North-America; North-Atlantic; Northern-Appalachians; Nova-Scotia; orogenic-belts; Quebec-; reflection-methods; refraction-methods; seismic-methods; seismic-profiles; surveys-; tectonics-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1205-1221. 1998.


Citation_Text:
BK: Lithoprobe East transect--Le transect est du projet Lithoprobe.
BA: Quinlan-Garry (editor)
BF: Memorial University of Newfoundland, Department of Earth Sciences, Saint John's, NF, United States
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1203-1346. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
DE: Appalachians-; Canada-; crust-; Eastern-Canada; geophysical-surveys; geotraverses-; Lithoprobe-; Lithoprobe-East; lithosphere-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; orogenic-belts; surveys-; tectonics-
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Monograph
NN: Individual papers are cited separately.
IL: illus. incl. sects., sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 1999-045753
UD: 199916

Title:
Lithoprobe East transect--Le transect est du projet Lithoprobe.

Keywords:
Appalachians-; Canada-; crust-; Eastern-Canada; geophysical-surveys; geotraverses-; Lithoprobe-; Lithoprobe-East; lithosphere-; Newfoundland-; Newfoundland-Island; North-America; Northern-Appalachians; orogenic-belts; surveys-; tectonics-

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 11, Pages 1203-1346. 1998.


Citation_Text:
TI: Automatic detection of seismic phases using variance fractal-dimension trajectory.
AU: Jiao-Lingxiu; Moon-Wooil-M
AF: University of Manitoba, Geophysics Department, Winnipeg, MB,
SO: Geoscience Journal (Seoul). 2; 1, Pages 37-45. 1998.
PB: Hanrimwon Publishing Company for the Geological Society of Korea. Seoul, South Korea. 1998.
CP: South-Korea
PY: 1998
LA: English
AB: Seismic refraction signals in crustal surveys are often contaminated by various types of noise mainly due to low-signal/noise Earth environments. A variance fractal-dimension technique is investigated and applied to real data sets for detection of seismic refraction signals from background noise. The sharpness of transition features on the variance fractal-dimension trajectory was used as a criterion for distinguishing the seismic signals, and a window size of 48 samples and a window spacing of 8 sample intervals were chosen to calculate the fractal dimensions and to create the trajectories for subsequent tests and detection of phases Pg, Pn, PmP, and ground roll. The real data tested in this study were obtained from the 1992 Abitibi-Grenville Lithoprobe high-resolution refraction and wide-angle reflection experiments. The transition criterion provides a robust and powerful tool for separating the real seismic-refraction signals from the background noise. In the case of Pg phase from the refraction profile fan-shot ab2, the variance fractal-dimensions are generally smaller for the refraction signals ( approximately 1.25) compared to the background noise ( approximately 1.75).
DE: data-processing; detection-; fractals-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; refraction-methods; seismic-methods; seismic-profiles; surveys-
CC: 20-Applied-geophysics
DT: Serial
BL: Analytic
IL: Refs: 21; illus.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 1226-4806
AN: 1999-044283
UD: 199915

Title:
Automatic detection of seismic phases using variance fractal-dimension trajectory.

Keywords:
data-processing; detection-; fractals-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; refraction-methods; seismic-methods; seismic-profiles; surveys-

Issue:
Geoscience Journal (Seoul). 2; 1, Pages 37-45. 1998.

Publisher:
Hanrimwon Publishing Company for the Geological Society of Korea. Seoul, South Korea. 1998.


Citation_Text:
TI: Sudbury meteorite-impact structure modeling with LITHOPROBE high-resolution seismic refraction results.
AU: Moon-Wooil-M; Jiao-L-X
AF: University of Manitoba, Geophysics Department, Winnipeg, MB, Canada
SO: Geoscience Journal (Seoul). 2; 1, Pages 26-36. 1998.
PB: Hanrimwon Publishing Company for the Geological Society of Korea. Seoul, South Korea. 1998.
CP: South-Korea
PY: 1998
LA: English
AB: The Sudbury Structure is well known but is still being investigated extensively because the origin and formation history have many questions. Geologically it is believed to be a meteorite-impact structure and is composed of the Sudbury Igneous Complex along the border, young sedimentary rocks in the Basin, and Levack Gneiss Complex outside the north range of the basin structure. The 1992 high-resolution refraction seismic survey, carried out as a part of the LITHOPROBE Abitibi-Grenville Transect experiments, included two in-line profiles in cross pattern and two fan-shot profiles perpendicular to them. Scientific objectives of these profiles include 2-D and 3-D imaging of the crustal structures beneath the Sudbury Structure and the surrounding areas. Results of forward and inverse modelings, tomographic inversion, and preliminary interpretation of the refraction seismic data indicate that there is a distinctive high-velocity layer with a lenticular shape below the Sudbury Basin structure at a depth range of approximately 4.5-9.0 km. Even after 2 billion years of deformation, including the truncation by erosion and several stages of subsequent geological evolution, the concave-upward shape of the velocity anomaly conforms to the proposed original meteorite-impact model and has close correlation.
DE: Canada-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; high-resolution-methods; impact-features; Lithoprobe-; meteorites-; Ontario-; refraction-methods; seismic-methods; seismic-profiles; Sudbury-Structure; surveys-
CC: 23-Geomorphology; 20-Applied-geophysics
DT: Serial
BL: Analytic
MC: LAT: N470000; N470000; LONG: W0810000; W0810000.
IL: Refs: 29; illus. incl. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 1226-4806
AN: 1999-044282
UD: 199915

Title:
Sudbury meteorite-impact structure modeling with LITHOPROBE high-resolution seismic refraction results.

Keywords:
Canada-; Eastern-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; high-resolution-methods; impact-features; Lithoprobe-; meteorites-; Ontario-; refraction-methods; seismic-methods; seismic-profiles; Sudbury-Structure; surveys-

Issue:
Geoscience Journal (Seoul). 2; 1, Pages 26-36. 1998.


Citation_Text:
TI: Emplacement and deformation of granites during transpression; magnetic fabrics of the Archean Sparrow Pluton, Slave Province, Canada.
AU: Benn-Keith; Ham-Natalie-M; Pignotta-Geoffrey-S; Bleeker-Wouter
AF: University of Ottawa, Ottawa-Carleton Geoscience Centre, Ottawa, ON, Canada
BK: In: Extraction, transport and emplacement of granitic magmas.
BA: Benn-K (editor); Cruden-A-R (editor); Sawyer-E-W (editor); Evans-J-P (editor)
SO: Journal of Structural Geology. 20; 9-10, Pages 1247-1259. 1998.
PB: Pergamon. Oxford-New York, International. 1998.
CP: International
PY: 1998
CN: Extraction, transport and emplacement of granitic magmas symposium. Ottawa, Canada. May 1997.
LA: English
DE: anisotropy-; Archean-; Canadian-Shield; deformation-; emplacement-; foliation-; granites-; igneous-rocks; intrusions-; lineation-; Lithoprobe-; magnetic-susceptibility; mapping-; North-America; paleomagnetism-; petrofabrics-; plutonic-rocks; plutons-; Precambrian-; preferred-orientation; Prosperous-Suite; Slave-Province; Sparrow-Pluton; strain-; structural-analysis; transpression-; two-mica-granite; upper-Archean; Yellowknife-Domain; Yellowknife-Supergroup
CC: 16-Structural-geology; 05A-Igneous-and-metamorphic-petrology
DT: Serial; Conference-Document
BL: Analytic
MC: LAT: N630000; N630000; LONG: W1143000; W1143000.
IL: Refs: 49; illus. incl. geol. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0191-8141
CO: JSGEDY
AN: 1999-042890
UD: 199915

Title:
Emplacement and deformation of granites during transpression; magnetic fabrics of the Archean Sparrow Pluton, Slave Province, Canada.

Keywords:
anisotropy-; Archean-; Canadian-Shield; deformation-; emplacement-; foliation-; granites-; igneous-rocks; intrusions-; lineation-; Lithoprobe-; magnetic-susceptibility; mapping-; North-America; paleomagnetism-; petrofabrics-; plutonic-rocks; plutons-; Precambrian-; preferred-orientation; Prosperous-Suite; Slave-Province; Sparrow-Pluton; strain-; structural-analysis; transpression-; two-mica-granite; upper-Archean; Yellowknife-Domain; Yellowknife-Supergroup

Issue:
Journal of Structural Geology. 20; 9-10, Pages 1247-1259. 1998.

Publisher:
Pergamon. Oxford-New York, International. 1998.


Citation_Text:
BK: 1996 LITHOPROBE western Superior seismic refraction survey; field acquisition and processing report.
BA: Asudeh-I; White-D; Roberts-R; Forsyth-D; Kay-I; Cartwright-T; Carroll-P; Hajnal-Z; Koperwhats-B; Musacchio-G; Farrell-D
SO: Open-File Report - Geological Survey of Canada. 1999.
NT: Lithoprobe Report
PB: Geological Survey of Canada. Calgary, AB, Canada. Pages: 223. 1999.
CP: Canada
PY: 1999
LA: English
DE: Canada-; Canadian-Shield; data-acquisition; data-processing; Eastern-Canada; geophysical-methods; geophysical-surveys; Lithoprobe-; North-America; Ontario-; refraction-methods; seismic-methods; Superior-Province; surveys-
CC: 20-Applied-geophysics
DT: Serial; Report
BL: Monograph
IL: Refs: 4; illus. incl. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
CO: #02369
RN: 3583
AN: 1999-041734
UD: 199914

Author:
Asudeh-I; White-D; Roberts-R; Forsyth-D; Kay-I; Cartwright-T; Carroll-P; Hajnal-Z; Koperwhats-B; Musacchio-G; Farrell-D

Title:
1996 LITHOPROBE western Superior seismic refraction survey; field acquisition and processing report.

Keywords:
Canada-; Canadian-Shield; data-acquisition; data-processing; Eastern-Canada; geophysical-methods; geophysical-surveys; Lithoprobe-; North-America; Ontario-; refraction-methods; seismic-methods; Superior-Province; surveys-

Issue:
Open-File Report - Geological Survey of Canada. 1999.

Publisher:
Geological Survey of Canada. Calgary, AB, Canada. Pages: 223. 1999.


Citation_Text:
TI: Progress on Triassic ichthyolith biostratigraphy and regional thermal-maturation studies, Trutch and Halfway maps areas, northeastern British Columbia.
AU: Johns-M-J; Barnes-C-R; Orchard-M-J
BK: In: Cordillera and Pacific margin/ Interior Plains and Arctic Canada--Cordillere et marge du Pacifique/ Plaines interieures et regions arctiques du Canada.
CA: Canada, Geological Survey, Canada
SO: Current Research - Geological Survey of Canada. Pages 51-59. 1999.
PB: Geological Survey of Canada. Ottawa, ON, Canada. 1999.
CP: Canada
PY: 1999
LA: English
AB: Ichthyolith (fish tooth and scale) biostratigraphic and thermal-maturation studies in Trutch (94 G) and Halfway River (94 B) map areas have been directly calibrated with ammonoid and conodont zonations, and the conodont geothermometric index. The goals of this study, supported through the LITHOPROBE SNORCLE and the Central Foreland NATMAP projects, are a refinement of the current provisional ichthyolith zonation, development of an ichthyolith colour alteration index for maturation assessments, and interpretation of environmental and paleogeographic factors that effect ichthyolith distributions. Ichthyoliths are a new tool for the development of a tectonostratigraphic framework for Triassic rocks of the region and in future hydrocarbon exploration.
DE: biostratigraphy-; biozones-; British-Columbia; Canada-; Chordata-; color-alteration-index; Halfway-map-sheet; ichthyoliths-; Jurassic-; Lower-Jurassic; Lower-Triassic; Mesozoic-; Middle-Triassic; northeastern-British-Columbia; Pisces-; stratigraphy-; thermal-maturity; Triassic-; Trutch-map-sheet; Upper-Triassic; Vertebrata-; Western-Canada
CC: 12-Stratigraphy
DT: Serial; Report
BL: Analytic
IL: Refs: 33; illus. incl. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
IS: 0704-2884
IB: 0-660-60781-6
RN: 1999-A/B
AN: 1999-041678
UD: 199914

Title:
Progress on Triassic ichthyolith biostratigraphy and regional thermal-maturation studies, Trutch and Halfway maps areas, northeastern British Columbia.

Keywords:
biostratigraphy-; biozones-; British-Columbia; Canada-; Chordata-; color-alteration-index; Halfway-map-sheet; ichthyoliths-; Jurassic-; Lower-Jurassic; Lower-Triassic; Mesozoic-; Middle-Triassic; northeastern-British-Columbia; Pisces-; stratigraphy-; thermal-maturity; Triassic-; Trutch-map-sheet; Upper-Triassic; Vertebrata-; Western-Canada

Issue:
Current Research - Geological Survey of Canada. Pages 51-59. 1999.

Publisher:
Geological Survey of Canada. Ottawa, ON, Canada. 1999.


Citation_Text:
BK: LITHOPROBE, southern Vancouver Island, British Columbia; geology.
BA: Yorath-C-J; Sutherland-Brown-A; Massey-N-W-D
SO: Bulletin - Geological Survey of Canada. 1999.
PB: Geological Survey of Canada. Ottawa, ON, Canada. Pages: 145. 1999.
CP: Canada
PY: 1999
LA: English
LS: French
AB: Phase 1 of LITHOPROBE involved co-ordinated geophysical and geological studies on southern Vancouver Island conducted from 1984 to 1986. Geological studies, the focus of this report, included 1:50 000 scale mapping as well as stratigraphic, geochemical, and structural studies in a corridor centred on Port Alberni and on southernmost Vancouver Island in the vicinity of Sooke. In the Port Alberni region the geological architecture of Wrangellia is expressed by three volcanic/plutonic successions separated by shallow marine carbonate and clastic deposits, the total ranging in age from mid-Paleozoic to Early Jurassic. Post accretionary clastic sediments of Late Cretaceous and Tertiary ages overlie Wrangellia and the adjacent Pacific Rim and Crescent terranes. The Alberni region is partitioned by northwesterly trending thrust faults and the Cowichan Anticlinorium, the latter dislocated by northerly trending faults and hypabyssal intrusions. The Metchosin Igneous Complex of southernmost Vancouver Island is part of the Crescent Terrane. It consists of layered gabbro, sheeted dykes, pillow basalts and flows forming a partial ophiolite. The complex represents an emergent volcanic island formed in a marginal basin setting. It was transported northwestward by and emplaced beneath the Leech River Fault. Integrated geological and seismic reflection data indicate that the Wrangellian crust of Vancouver Island is largely granitic rocks of the Island Intrusions with pendants and enclaves of Paleozoic to Lower Jurassic volcanic and sedimentary rocks. Prominent inclined reflectors in the seismic records are identified with the surface traces of thrust faults.
DE: areal-geology; British-Columbia; Canada-; economic-geology-maps; geologic-maps; geophysical-methods; geophysical-surveys; Lithoprobe-; maps-; seismic-methods; surveys-; Vancouver-Island; Western-Canada
CC: 13-Areal-geology
DT: Serial; Report; Map
BL: Monograph
MS: 1:100,000; 1:150,000
MP: geologic map; economic geology map
IL: Refs: 80; illus. incl. sects., strat. cols.
RF: GeoRef, Copyright 1999, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
IS: 0068-7626
IB: 0-660-17652-1
CO: CGSBAN
RN: 498
AN: 1999-040295
UD: 199914

Title:
LITHOPROBE, southern Vancouver Island, British Columbia; geology.

Keywords:
areal-geology; British-Columbia; Canada-; economic-geology-maps; geologic-maps; geophysical-methods; geophysical-surveys; Lithoprobe-; maps-; seismic-methods; surveys-; Vancouver-Island; Western-Canada

Issue:
Bulletin - Geological Survey of Canada. 1999.

Publisher:
Geological Survey of Canada. Ottawa, ON, Canada. Pages: 145. 1999.


Citation_Text:
TI: Lithoprobe East and the Newfoundland Appalachians; old questions answered and new questions raised.
AU: Quinlan-Garry
AF: Memorial University of Newfoundland, Department of Earth Sciences, Saint John's, NF, Canada
BK: In: Regional tectonics of Newfoundland and Labrador; new interpretations.
BA: Pickerill-R-K (editor); Barr-S-M (editor); Williams-G-L (editor)
SO: Atlantic Geology. 34; 2, Pages 152. 1998.
PB: Atlantic Geoscience Society. Fredericton, NB, Canada. 1998.
CP: Canada
PY: 1998
CN: Geological Association of Canada, 1998 annual technical meeting, Newfoundland Section. Saint John's, NF, Canada. Feb. 23-24, 1998.
LA: English
DE: Appalachians-; Canada-; continental-crust; crust-; Eastern-Canada; geophysical-surveys; geotraverses-; Lithoprobe-; Lithoprobe-East; Newfoundland-; North-America; Northern-Appalachians; programs-; progress-report; report-; surveys-
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0843-5561
CO: #01407
AN: 1999-039982
UD: 199914

Title:
Lithoprobe East and the Newfoundland Appalachians; old questions answered and new questions raised.

Keywords:
Appalachians-; Canada-; continental-crust; crust-; Eastern-Canada; geophysical-surveys; geotraverses-; Lithoprobe-; Lithoprobe-East; Newfoundland-; North-America; Northern-Appalachians; programs-; progress-report; report-; surveys-

Issue:
Atlantic Geology. 34; 2, Pages 152. 1998.

Publisher:
Atlantic Geoscience Society. Fredericton, NB, Canada. 1998.


Citation_Text:
TI: Crustal structure and history from patterns of Lithoprobe seismic data from Newfoundland, Labrador and adjacent areas.
AU: Hall-Jeremy
AF: Memorial University of Newfoundland, Department of Earth Sciences, Saint John's, NF, Canada
BK: In: Regional tectonics of Newfoundland and Labrador; new interpretations.
BA: Pickerill-R-K (editor); Barr-S-M (editor); Williams-G-L (editor)
SO: Atlantic Geology. 34; 2, Pages 149. 1998.
PB: Atlantic Geoscience Society. Fredericton, NB, Canada. 1998.
CP: Canada
PY: 1998
CN: Geological Association of Canada, 1998 annual technical meeting, Newfoundland Section. Saint John's, NF, Canada. Feb. 23-24, 1998.
LA: English
DE: Appalachian-Phase; Canada-; continental-crust; crust-; Eastern-Canada; fabric-; geophysical-methods; geophysical-surveys; geotraverses-; Labrador-; Lithoprobe-; mantle-; Newfoundland-; Paleoproterozoic-; Paleozoic-; Permian-; Precambrian-; programs-; Proterozoic-; seismic-methods; surveys-; thickness-; Torngat-Orogeny; upper-Precambrian; velocity-structure
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0843-5561
CO: #01407
AN: 1999-039975
UD: 199914

Title:
Crustal structure and history from patterns of Lithoprobe seismic data from Newfoundland, Labrador and adjacent areas.

Keywords:
Appalachian-Phase; Canada-; continental-crust; crust-; Eastern-Canada; fabric-; geophysical-methods; geophysical-surveys; geotraverses-; Labrador-; Lithoprobe-; mantle-; Newfoundland-; Paleoproterozoic-; Paleozoic-; Permian-; Precambrian-; programs-; Proterozoic-; seismic-methods; surveys-; thickness-; Torngat-Orogeny; upper-Precambrian; velocity-structure

Issue:
Atlantic Geology. 34; 2, Pages 149. 1998.


Citation_Text:
TI: Sole thrust of the Trans-Hudson Orogen.
AU: Pandit-B-I; Hajnal-Z
AF: University of Saskatchewan, Department of Geological Sciences, Saskatoon, SK, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 110. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The Trans-Hudson Orogen (THO) is a major Paleoproterozoic, continental-scale collisional orogenic belt in central North America. As part of the Lithoprobe program, about 2000 kms. of Vibroseis reflection data were acquired along several survey lines within the Manitoba and Saskatchewan segment of the orogen. Significant results of a seismic reprocessing program at the University of Saskatchewan carried out over nearly 1000 kms. of the above data sets are presented in this paper. Reprocessed seismic sections were obtained by employing a number of steps which were not part of the original signal enhancement program. Some of these advanced sequences included 1st-break refraction statics, multi-window deconvolution, local slant-stack velocity filtering, either post-stack finite-difference f-x migration on cross-dip corrected stacks or pre-stack phase migration and coherency filtering.Enhanced seismic images now available permit a clear 3-D visualization of the Pelican thrust which is a major ductile, high- strain structure in the Reindeer Zone of THO and is interpreted as the main sole thrust separating the Paleoproterozoic allohcthons and the underlying Archean crust. Whereas the surface exposure of this thrust encloses an area around 700 sq. kms., the reprocessed sections map this important feature over a sub-surface area which extends a few thousand sq. kms. In addition, sharper definitions at depth of other structural features such as Tabbernor Fault Zone including its branches and shear zones (Sturgeon-Weir, Guncoat) have been obtained. Such a mapping of the many branches of the Tabbernor fault was previously unsuccessful. Finally, the new images have helped identify an intricate duplex structure at the Moho level over a length of approximately 100 kms.
DE: Canada-; crust-; deconvolution-; duplexes-; faults-; filters-; finite-difference-analysis; geophysical-methods; geophysical-surveys; Guncoat-shear-zone; Hudsonian-Orogeny; Lithoprobe-; mapping-; Mohorovicic-discontinuity; orogenic-belts; Paleoproterozoic-; Pelican-Thrust; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; reflection-methods; Reindeer-Zone; seismic-methods; seismic-migration; shear-zones; statistical-analysis; strain-; Sturgeon-Weir-shear-zone; surveys-; Tabbernor-Fault; tectonics-; three-dimensional-models; thrust-faults; upper-Precambrian; velocity-; Vibroseis-; visualization-; Western-Canada
CC: 16-Structural-geology
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 1999-039498
UD: 199914

Keywords:
Canada-; crust-; deconvolution-; duplexes-; faults-; filters-; finite-difference-analysis; geophysical-methods; geophysical-surveys; Guncoat-shear-zone; Hudsonian-Orogeny; Lithoprobe-; mapping-; Mohorovicic-discontinuity; orogenic-belts; Paleoproterozoic-; Pelican-Thrust; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; reflection-methods; Reindeer-Zone; seismic-methods; seismic-migration; shear-zones; statistical-analysis; strain-; Sturgeon-Weir-shear-zone; surveys-; Tabbernor-Fault; tectonics-; three-dimensional-models; thrust-faults; upper-Precambrian; velocity-; Vibroseis-; visualization-; Western-Canada

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 110. 1998.

Publisher:
Geological Society of America (GSA). Boulder, CO, United States. 1998.


Citation_Text:
TI: Special seismic images of the western margin of the Trans-Hudson Orogen.
AU: Hajnal-Z; Nemeth-B; Lewry-J; Lucas-S; White-D; Clowes-R
AF: University of Saskatchewan, Department of Geological Sciences, Saskatoon, SK, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 108-109. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: Five spatially distributed, but closely linked, seismic reflections surveys investigated the Saskatchewan segment of the western region of the Paleoproterozoic Trans-Hudson Orogen, during the 1991, 1993 and 1994 field seasons of the LITHOPROBE. The integrated compilation of these data sets reveals a number of regionally comparable seismic images of the tectonic architecture of the collisional belt. There are comprehensive evidences for the intricate involvement of the lithosphere in the tectonic evolution of the area. Within the western part of the juvenile terrane the structurally disturbed Moho is always a strong reflector, characterized by distinct but simple wave forms. Under the craton, with the exception of Line S2B, the same mantle-crust contact, is recognized by weak, marginal reflections and associated complex seismic signatures. The amplitudes of seismic signals, throughout the lower crust, are high and marked by strong subparallel, laterally well traceable zones of reflection patterns. The exclusion is the southern part of Line S2B where the comparable lower crustal signatures are altered by a gentle southeastern dip Within the upper crust, short dipping patterns of reflectivity suggest complex brittle deformation. Interconnected seismic lines, starting from a well defined Archean window allow tracing of the sole thrust (Pelican Thrust) of the accreted terrane through the western flank of the orogenic belt The regionally distinct nature of these seismically defined structures implies involvement of variable collisional processes along a north-south strike of the of the western orogen.
DE: accretion-; amplitude-; Archean-; Canada-; crust-; elastic-waves; geophysical-methods; geophysical-surveys; Hudsonian-Orogeny; Lithoprobe-; lithosphere-; lower-crust; Mohorovicic-discontinuity; orogenic-belts; Paleoproterozoic-; Pelican-Thrust; plate-collision; plate-tectonics; Precambrian-; processes-; Proterozoic-; reflection-methods; Saskatchewan-; seismic-methods; seismicity-; spatial-distribution; surveys-; tectonics-; terranes-; upper-Precambrian; waveforms-; Western-Canada
CC: 16-Structural-geology; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 1999-039476
UD: 199914

Author:
Hajnal-Z; Nemeth-B; Lewry-J; Lucas-S; White-D; Clowes-R

Title:
Special seismic images of the western margin of the Trans-Hudson Orogen.

Keywords:
accretion-; amplitude-; Archean-; Canada-; crust-; elastic-waves; geophysical-methods; geophysical-surveys; Hudsonian-Orogeny; Lithoprobe-; lithosphere-; lower-crust; Mohorovicic-discontinuity; orogenic-belts; Paleoproterozoic-; Pelican-Thrust; plate-collision; plate-tectonics; Precambrian-; processes-; Proterozoic-; reflection-methods; Saskatchewan-; seismic-methods; seismicity-; spatial-distribution; surveys-; tectonics-; terranes-; upper-Precambrian; waveforms-; Western-Canada

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 108-109. 1998.


Citation_Text:
TI: P-wave velocity structure of the Trans-Hudson Orogen.
AU: Hajnal-Z; Nemeth-B
AF: University of Saskatchewan, Department of Geological Sciences, Saskatoon, SK, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 109. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: Evolution of the North-American continent includes the Early-Proterozoic collision of the Superior and the Hearne cratons. These two Archean provinces are welded together by an orogenic belt, known as the Trans-Hudson Orogen (THO), exposed in northern Saskatchewan and Manitoba. The lack of significant tectonic activity in the area since the Proterozoic times kept the remnants of the collisional processes well-preserved in the lithosphere.As part of the LITHOPROBE program, three long-range seismic refraction profiles were deployed across the THO to investigate the velocity structure of the collisional zone. Analysis of the data revealed significant P-wave velocity anomalies in the mantle, beneath the central region of the orogenic belt. The velocity variations are seem to be caused by an elongated anisotropic region, extending near vertically from the base of the crust to greater depth. Position and horizontal extent of this anomalous mantle zone suggest that it may represent a preserved mantle suture structure, that joins two Archean cratons. The location of the kimberlite fields, discovered near Prince Albert, Saskatchewan seem to further support this hypothesis. Above the anomalous mantle region, crustal velocities are also variable. However, these crustal velocity anomalies cannot be correlated to the recognized geological terranes of the THO. It is plausible that these velocity anomalies are related to differences in the thermo-tectonic history of the crust. Furthermore, the detected velocity anomalies appear to correlate well to changes in crustal reflectivity patterns, evident on the THO reflection profiles.
DE: body-waves; Canada-; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; Hearne-Craton; Hudsonian-Orogeny; Lithoprobe-; lithosphere-; mantle-; North-America; orogenic-belts; P-waves; Paleoproterozoic-; plate-collision; plate-tectonics; Precambrian-; Prince-Albert-Saskatchewan; Proterozoic-; reflection-; Saskatchewan-; seismic-methods; seismic-profiles; seismic-waves; seismicity-; Superior-Craton; surveys-; tectonics-; upper-Precambrian; variations-; velocity-structure; Western-Canada
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 1999-039472
UD: 199914

Title:
P-wave velocity structure of the Trans-Hudson Orogen.

Keywords:
body-waves; Canada-; elastic-waves; geophysical-methods; geophysical-profiles; geophysical-surveys; Hearne-Craton; Hudsonian-Orogeny; Lithoprobe-; lithosphere-; mantle-; North-America; orogenic-belts; P-waves; Paleoproterozoic-; plate-collision; plate-tectonics; Precambrian-; Prince-Albert-Saskatchewan; Proterozoic-; reflection-; Saskatchewan-; seismic-methods; seismic-profiles; seismic-waves; seismicity-; Superior-Craton; surveys-; tectonics-; upper-Precambrian; variations-; velocity-structure; Western-Canada

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 109. 1998.


Citation_Text:
TI: National Gravity Survey Program of the Geological Survey of Canada, 1991-92.
AU: Hearty-D-B; Gibb-R-A
BK: In: Current research, Part D, Eastern Canada and national and general programs--Recherches en cours, Partie D, Est du Canada et programmes nationaux et generaux.
CA: Canada, Geological Survey,
SO: Paper - Geological Survey of Canada. Pages 129-132. 1992.
PB: Geological Survey of Canada. Ottawa, ON, Canada. 1992.
CP: Canada
PY: 1992
LA: English
DE: airborne-methods; British-Columbia; Canada-; Eastern-Canada; Franklin-District-Northwest-Territories; Geological-Survey-of-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; government-agencies; gravity-methods; Lithoprobe-; Mackenzie-District-Northwest-Territories; Manitoba-; Northwest-Territories; Ontario-; Quebec-; Saskatchewan-; survey-organizations; surveys-; Western-Canada; Yukon-Territory
CC: 20-Applied-geophysics
DT: Serial; Report
BL: Analytic
IL: sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
IS: 0068-7650
IB: 0660570653
CO: CGSPAV
RN: 92-01D
AN: 1999-037451
UD: 199913

Title:
National Gravity Survey Program of the Geological Survey of Canada, 1991-92.

Keywords:
airborne-methods; British-Columbia; Canada-; Eastern-Canada; Franklin-District-Northwest-Territories; Geological-Survey-of-Canada; geophysical-methods; geophysical-profiles; geophysical-surveys; government-agencies; gravity-methods; Lithoprobe-; Mackenzie-District-Northwest-Territories; Manitoba-; Northwest-Territories; Ontario-; Quebec-; Saskatchewan-; survey-organizations; surveys-; Western-Canada; Yukon-Territory

Issue:
Paper - Geological Survey of Canada. Pages 129-132. 1992.

Publisher:
Geological Survey of Canada. Ottawa, ON, Canada. 1992.


Citation_Text:
TI: Crustal-scale extensional collapse of the Elzevir Orogen, Grenville Province, S.W. Quebec imaged by Lithoprobe.
AU: Harris-Lyal-B; Rivard-Benoit; Corriveau-Louise
AF: University of Western Australia, Department of Geology and Geophysics, Tectonics Special Research Centre, Nedlands, West. Aust., Australia
BK: In: The assembly and breakup of Rodinia; proceedings of a workshop.
BA: Bird-Robert-T (convener); Powell-Christopher-McA (convener); Wingate-Michael-T-D (convener)
CA: University of Western Australia, Australia; Curtin University of Technology, AUS; University of Texas at Austin, United States; Australia, Geological Society, Australia; University of Tasmania,
SO: Abstracts - Geological Society of Australia. 50; Pages 39. 1998.
PB: Geological Society of Australia. Sydney, N.S.W., Australia. 1998.
CP: Australia
PY: 1998
CN: The assembly and breakup of Rodinia. Nedlands, West. Aust., Australia. Sept. 7-8, 1998.
LA: English
DE: Canada-; Canadian-Shield; collapse-structures; crust-; data-; domes-; Eastern-Canada; Elzevir-Terrane; extension-tectonics; faults-; folds-; gneisses-; Grenville-Province; Lithoprobe-; metamorphic-rocks; North-America; orogeny-; plate-rotation; plate-tectonics; Quebec-; seismicity-; shear-zones; tectonics-; terranes-
CC: 16-Structural-geology; 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0729-011X
AN: 1999-035550
UD: 199913

Author:
University of Western Australia, Australia; Curtin University of Technology, AUS; University of Texas at Austin, United States; Australia, Geological Society, Australia; University of Tasmania,

Title:
Crustal-scale extensional collapse of the Elzevir Orogen, Grenville Province, S.W. Quebec imaged by Lithoprobe.

Keywords:
Canada-; Canadian-Shield; collapse-structures; crust-; data-; domes-; Eastern-Canada; Elzevir-Terrane; extension-tectonics; faults-; folds-; gneisses-; Grenville-Province; Lithoprobe-; metamorphic-rocks; North-America; orogeny-; plate-rotation; plate-tectonics; Quebec-; seismicity-; shear-zones; tectonics-; terranes-

Issue:
Abstracts - Geological Society of Australia. 50; Pages 39. 1998.

Publisher:
Geological Society of Australia. Sydney, N.S.W., Australia. 1998.


Citation_Text:
BK: Crustal velocity structure of the Superior and Grenville provinces of the southeastern Canadian Shield.
BA: Winardhi-Sonny
CP: Canada
PY: 1997
DG: Doctoral
DI: University of Western Ontario. London, ON, Canada. 1997.
LA: English
AB: In the summer of 1992, the Lithoprobe Abitibi-Grenville Seismic Refraction Experiment was conducted across the Grenville and Superior Provinces of the Southeastern Canadian Shield. More than 17,000 seismograms were collected during the survey from 44 shot points at an average shot spacing of 30 km and station spacing of 1-1.5 km. Each shot was recorded by 417 instruments, 47 of which were three-component systems which were placed strategically across the Grenville Front. The dense ray coverage in the area allowed us to make a detailed study of the variation of crustal velocities using seismic refraction tomography. The shallow velocity structure under the profiles was mapped using a delay-time analysis of the P (sub g) phases. A study of wide-angle reflected waves from the Moho (P (sub m) P) was carried out to constrain the thickness of the crust and the nature of the crust-mantle boundary. Three-component analysis was also employed to explore the anisotropic nature of the upper crust in the vicinity of the Grenville Front Tectonic Zone. The 2-D tomographic inversion was performed using an iterative conjugate gradient technique, whereas its corresponding uncertainty in the velocity determinations were estimated using a combination of the very fast simulated annealing and calculation of the ray-path density. From the three-component data set, polarization and propagation vectors were extracted. Angular deviations between these two directions (5-15 degrees) were then inverted to give parameters describing the anisotropic nature of the uppermost crust in the vicinity of the receivers. The latter was performed using a non-linear inversion technique utilizing the very fast simulated annealing. The delay-time analysis and tomographic inversion of the data set demonstrate significant lateral and vertical variations in crustal velocities from one terrane to another, with the largest velocity values occurring underneath the Central Gneiss and the Central Metasedimentary Belts south of the Grenville Front. The Grenville Front Tectonic Zone is imaged as a southeast dipping region of anomalous velocity gradients extending to the Moho. The velocity anomaly maps suggest that Archean crust may extend, horizontally, 140 km beneath the northern Grenville Province. Near surface velocity anomalies correlate well with the known geology. The most prominent of these are the Sudbury Structure which is well mapped as a low velocity basinal structure. The tomography images also suggest underthrusting of the Pontiac and Quetico subprovinces beneath the Abitibi Greenstone Belt. Wide-angle P (sub m) P signals indicate that the Moho varies from a sharp discontinuity south of the Grenville Front to a rather diffuse and flat boundary under the Abitibi Greenstone Belt north of the Grenville Front. A significant crustal thinning near the Grenville Front may indicate post-Grenvillian rebound and/or the extensional structure of the Ottawa-Bonnechere graben. Crustal thickening resulting from continental collision may explain the tomographic images which show that the Moho is 4-5 km deeper south of the Grenville Front. The inversion of the anisotropic parameters, on the other hand, indicates that the anisotropic nature of the uppermost crust in the vicinity of the Grenville Front may be caused by an aligned dry-cracks or fractures oriented subparallel to the predominant rock foliation in this region.
DE: Abitibi-Belt; anisotropic-materials; Canada-; Canadian-Shield; crust-; Eastern-Canada; geophysical-profiles; geophysical-surveys; Grenville-Front; Grenville-Province; inverse-problem; Lithoprobe-; mantle-; Mohorovicic-discontinuity; North-America; Ontario-; seismic-profiles; seismograms-; Sudbury-Structure; Superior-Province; surveys-; tomography-; velocity-structure
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Thesis-or-Dissertation
BL: Monograph
IL: illus.
RF: GeoRef, Copyright 1999, American Geological Institute.
AN: 99-35061
UD: 199912

Title:
Crustal velocity structure of the Superior and Grenville provinces of the southeastern Canadian Shield.

Keywords:
Abitibi-Belt; anisotropic-materials; Canada-; Canadian-Shield; crust-; Eastern-Canada; geophysical-profiles; geophysical-surveys; Grenville-Front; Grenville-Province; inverse-problem; Lithoprobe-; mantle-; Mohorovicic-discontinuity; North-America; Ontario-; seismic-profiles; seismograms-; Sudbury-Structure; Superior-Province; surveys-; tomography-; velocity-structure


Citation_Text:
TI: Frozen subduction in Canada's Northwest Territories; Lithoprobe deep lithospheric reflection profiling of the western Canadian Shield.
AU: Cook-Frederick-A; van-der-Velden-Arie-J; Hall-Kevin-W; Roberts-Brian-J
AF: University of Calgary, Department of Geology and Geophysics, Calgary, AB, Canada
SO: Tectonics. 18; 1, Pages 1-24. 1999.
PB: American Geophysical Union. Washington, DC, United States. 1999.
CP: United-States
PY: 1999
LA: English
DE: accretion-; Archean-; Canada-; Canadian-Shield; cratons-; crust-; data-processing; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; lithosphere-; lower-crust; mantle-; Mohorovicic-discontinuity; North-America; Northwest-Territories; plate-tectonics; Precambrian-; Proterozoic-; reflectance-; reflection-methods; rifting-; seismic-methods; seismic-profiles; Slave-Province; subduction-; surveys-; tectonics-; terranes-; upper-Precambrian; Wopmay-Orogeny
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
MC: LAT: N550000; N650000; LONG: W1100000; W1400000.
IL: Refs: 78; illus. incl. 2 tables, geol. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0278-7407
CO: TCTNDM
AN: 99-33945
UD: 199912

Title:
Frozen subduction in Canada's Northwest Territories; Lithoprobe deep lithospheric reflection profiling of the western Canadian Shield.

Keywords:
accretion-; Archean-; Canada-; Canadian-Shield; cratons-; crust-; data-processing; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; lithosphere-; lower-crust; mantle-; Mohorovicic-discontinuity; North-America; Northwest-Territories; plate-tectonics; Precambrian-; Proterozoic-; reflectance-; reflection-methods; rifting-; seismic-methods; seismic-profiles; Slave-Province; subduction-; surveys-; tectonics-; terranes-; upper-Precambrian; Wopmay-Orogeny


Citation_Text:
TI: The Deep Probe experiment; what is the role of inherited structure in the continents?.
AU: Levander-Alan; Henstock-T-J; Snelson-C-M; Keller-G-R; Gorman-A-R; Clowes-R-M; Humphreys-E
AF: Rice University, Department of Geology and Geophysics, Houston, TX, United States
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 161. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The 1995 Deep Probe experiment was an active source seismic experiment conducted in collaboration with the Canadian Lithoprobe project along a N-S line extending from southern New Mexico to Great Slave Lake. The experiment has produced a 2600-km-long velocity model showing large scale crustal and upper mantle structure. Three different types of crustal structures are observed along the line, with changes that lie close to Archean and Proterozoic aged sutures rather than physiographic boundaries. The Archean Hearne province in Alberta has a crustal thickness of 35-40 km with a simple vertical gradient in seismic velocity through the crust. The Archean Wyoming province in Wyoming and Montana has crustal thickness of 50-55 km with the lowermost 25 km of the crust consisting of a distinct layer having unusual seismic velocities of 7.0-7.3 km/s. The Proterozoic accreted terranes of the Colorado Plateau have a crustal thickness of 40-45 km, and can again be described using a simple vertical gradient. A major change in upper mantle structure along the line occurs close to the change from Archean to Proterozoic crust. The Colorado Plateau is underlain by mantle with seismic velocities of 7.9-8.0 km/s and a P-wave low velocity zone centered at 75 km depth and 45 km thick. In contrast, the Archean terranes are underlain by mantle that is typically faster (up to 8.1-8.2 km/s), and has a strong positive velocity gradient. These results pose important questions about continental evolution. Although the profile has had strongly varying geologic history, with differing extents and expressions of deformation, present crustal structure still correlates with the initial continental assembly. In particular, the unusual lower crustal layer of the Wyoming province shows little variation between the Laramide mountains and the plains. Apparently the character of continental blocks can retained even through episodes of strong deformation.
DE: Alberta-; Archean-; body-waves; Canada-; Colorado-Plateau; crust-; Deep-Probe; deformation-; elastic-waves; geophysical-methods; geophysical-surveys; Great-Slave-Lake; Laramide-Orogeny; low-velocity-zones; Mackenzie-District-Northwest-Territories; mantle-; New-Mexico; Northwest-Territories; P-waves; Precambrian-; Proterozoic-; seismic-methods; seismic-waves; surveys-; suture-zones; thickness-; United-States; upper-mantle; upper-Precambrian; variations-; Western-Canada; Western-U.S.; Wyoming-Province
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-33636
UD: 199912

Author:
Levander-Alan; Henstock-T-J; Snelson-C-M; Keller-G-R; Gorman-A-R; Clowes-R-M; Humphreys-E

Title:
The Deep Probe experiment; what is the role of inherited structure in the continents?.

Keywords:
Alberta-; Archean-; body-waves; Canada-; Colorado-Plateau; crust-; Deep-Probe; deformation-; elastic-waves; geophysical-methods; geophysical-surveys; Great-Slave-Lake; Laramide-Orogeny; low-velocity-zones; Mackenzie-District-Northwest-Territories; mantle-; New-Mexico; Northwest-Territories; P-waves; Precambrian-; Proterozoic-; seismic-methods; seismic-waves; surveys-; suture-zones; thickness-; United-States; upper-mantle; upper-Precambrian; variations-; Western-Canada; Western-U.S.; Wyoming-Province

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 161. 1998.


Citation_Text:
TI: Continental assembly, stability, and disassembly.
AU: Levander-Alan
AF: Rice University, Department of Geology and Geophysics, Houston, TX, United States
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 149. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The proven concept of the natural field laboratory that forms the basis for the NSF Continental Dynamics program is readily extended to the whole of North America to understand the processes of continental growth, stability, and disassembly. The North American continent offers a rich variety of tectonic regimes including one of Earth's three great orogenic plateaus, one of the great strike-slip systems, a number of ancient orogens, and two passive margins. These encircle the stable craton, the site of a number of long-lived, poorly understood intracratonic basins, and underlain by presumably ancient stable tectospheric mantle. The investigations will combine all traditional fields of Earth Science. At the largest scale the entire continent can be imaged at scales over 20 km in 10 years using a combined fixed and portable array of teleseismic recorders proposed as the USArray within the seismological community. The teleseismic images will provide a framework within which selected areas should be targeted for more detailed studies of 1 to 5 years duration which could include active source seismic to reach scales down to about 100 m, and petrologic, geochronologic, geobarometric/geothermometric, and deformation/structural studies spanning of 10's of km to microscales. The detailed study areas could be chosen to address the poorly understood processes of fluid flow, magmatism and metamorphism in the crust, lower crustal flow, and crust-mantle interactions in convergent and extensional settings, and variations in lithospheric stress and rheology in areas of active faulting. Field investigations would be combined with extensive lab programs and possibly continental drilling. The US geophysics community is organized through IRIS, UNAVCO, and a number of Ocean Science initiatives. The geologic community has no similar service structures but can adopt aspects of the model provided by Lithoprobe, our most prominent international collaborator for investigation of North America.
DE: basins-; crust-; deformation-; extension-tectonics; geophysical-methods; geophysical-surveys; intracratonic-basins; Lithoprobe-; lithosphere-; mantle-; North-America; orogeny-; passive-margins; plate-tectonics; seismic-methods; surveys-; tectonics-; teleseismic-signals; variations-
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-33614
UD: 199912

Title:
Continental assembly, stability, and disassembly.

Keywords:
basins-; crust-; deformation-; extension-tectonics; geophysical-methods; geophysical-surveys; intracratonic-basins; Lithoprobe-; lithosphere-; mantle-; North-America; orogeny-; passive-margins; plate-tectonics; seismic-methods; surveys-; tectonics-; teleseismic-signals; variations-

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 149. 1998.


Citation_Text:
TI: Superior Province tectonics; new wrinkles on some old rocks.
AU: Percival-John-A; Skulski-Thomas
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 45-46. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: Superior Province, core of the North American continent, is itself a collage of continental and oceanic fragments, formed episodically between 3.1 and 2.7 Ga, and united ca. 2.7 Ga. New mapping in remote regions, geochronology, isotope geochemistry and three LITHOPROBE transects have led to a four-dimensional view of the evolution of the Superior craton. The oldest components, preserved mainly in the North Caribou and Minto blocks in the north, are volcanic and tonalitic rocks of arc affinity, and are overlain locally by quartzite-komatiite sequences that record Mesoarchean breakup of a pre-2.9 Ga protocraton. Evidence is preserved locally for 2.87-2.81 Ga juxtaposition of fragments of juvenile oceanic crust, however the main phase of recorded crustal growth occurred in arc systems active between 2.75 and 2.70 Ga, at the same time that an Andean margin (Berens-Bienville-Minto continental arc) was developing on the older cratonic nucleus. Successive collisions between the Uchi-La Grande, Wabigoon-Opatica and Abitibi-Wawa arcs and the growing continental landmass led to termination of arc magmatism, crustal stacking, metamorphism and sedimentation in flysch basins between 2.71 and 2.69 Ga. Following amalgamation, transpressive deformation was focussed on major crustal boundaries and was followed by regional low-pressure metamorphism, emplacement of crustally-derived leucogranites, fluid release and orogen-parallel flow in the deep crust (2.66-2.60 Ga), perhaps related to craton-wide thermal relaxation and lithospheric delamination. Exposed upper and mid-crustal levels record progressively younger time windows in the orogenic evolution, reflected in seismic profiles characterized by shallow transparent zones underlain by deep, subhorizontal reflectivity. Mantle reflectors are probably early features preserved in relatively stiff upper mantle.
DE: Archean-; Canadian-Shield; crust-; deformation-; delamination-; diorites-; four-dimensional-models; geochronology-; granites-; igneous-rocks; leucogranite-; Lithoprobe-; low-pressure; magmatism-; mantle-; metamorphism-; Minto-Block; North-America; North-Caribou-Block; oceanic-crust; orogeny-; plate-collision; plate-tectonics; plutonic-rocks; Precambrian-; pressure-; sedimentation-; Superior-Province; tectonics-; tonalite-; transpression-; volcanic-rocks
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-33611
UD: 199912

Title:
Superior Province tectonics; new wrinkles on some old rocks.

Keywords:
Archean-; Canadian-Shield; crust-; deformation-; delamination-; diorites-; four-dimensional-models; geochronology-; granites-; igneous-rocks; leucogranite-; Lithoprobe-; low-pressure; magmatism-; mantle-; metamorphism-; Minto-Block; North-America; North-Caribou-Block; oceanic-crust; orogeny-; plate-collision; plate-tectonics; plutonic-rocks; Precambrian-; pressure-; sedimentation-; Superior-Province; tectonics-; tonalite-; transpression-; volcanic-rocks

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 45-46. 1998.


Citation_Text:
TI: Extrusion of eclogites in the eastern Grenville Province; seismic and potential-field test of a lateral-ramp model.
AU: Eaton-David-W; Hynes-Andrew
AF: University of Western Ontario, Department of Earth Sciences, London, ON, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 353. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The Grenville Province is an extensive zone of continental crustal thickening in the southwestern Canadian Shield which preserves diverse assemblages of high-grade crystalline rocks that experienced a common major tectonothermal event at ca. 1000 Ma. Tectonic slices of high-pressure (eclogite facies) rocks of continental affinity provide a window into deep-crustal processes within the orogen. In 1993, Lithoprobe acquired an oblique, 250-km seismic transect in the Grenville Province alongside the Triassic Manicouagan meteorite impact. The seismic profile contains prominent out-of-plane reflections which originate from high-pressure terranes and bounding fault zones adjacent to the profile. Exceptionally good agreement between the observed pitch of reflections and that predicted from the attitudes of shear zones and penetrative strain fabrics along the profile has provided the basis for development of a 3-D crustal model for the Manicouagan corridor. Analysis of crooked segments of the seismic profile and 3-D gravity modeling are used here as an independent test of the proposed model. A key feature of this model is the presence of an embayment in the southeast tapering Archean (Superior Province) basement, which is interpreted to extend beneath the region. The size and geometry of this embayment suggests that it represents a lateral ramp that controlled the distribution and rapid extrusion of once deeply buried material from the orogenic root.
DE: Canadian-Shield; continental-crust; crust-; crustal-thickening; crystalline-rocks; eclogite-; eclogite-facies; facies-; geophysical-methods; geophysical-surveys; gravity-methods; Grenville-Province; high-pressure; Lithoprobe-; metamorphic-rocks; models-; North-America; orogeny-; pressure-; processes-; seismic-methods; Superior-Province; surveys-
CC: 18-Solid-earth-geophysics; 05A-Igneous-and-metamorphic-petrology
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-33610
UD: 199912

Title:
Extrusion of eclogites in the eastern Grenville Province; seismic and potential-field test of a lateral-ramp model.

Keywords:
Canadian-Shield; continental-crust; crust-; crustal-thickening; crystalline-rocks; eclogite-; eclogite-facies; facies-; geophysical-methods; geophysical-surveys; gravity-methods; Grenville-Province; high-pressure; Lithoprobe-; metamorphic-rocks; models-; North-America; orogeny-; pressure-; processes-; seismic-methods; Superior-Province; surveys-

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 353. 1998.


Citation_Text:
TI: Crustal growth and continental collisions in the 1.9-1.8 Ga Trans-Hudson Orogen (Manitoba and Saskatchewan).
AU: Lucas-S; Hajnal-Z; White-D; Bleeker-W; Ansdell-K
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 46. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: Trans-Hudson Orogen in Manitoba and Saskatchewan represents a unique window on this Himalayan-scale, Paleoproterozoic orogenic belt in that it preserves extensive juvenile crust as well as three Archean cratons (Superior, Hearne and Sask), and was not severely modified by post-orogenic extension or magmatism. Lithoprobe seismic reflection, refraction and magnetotelluric (MT) data, coupled with new geological, geochronological, geochemical and paleomagnetic information, have generated a new 4D understanding of the orogen. Major advances include recognition of (1) early intraoceanic collision-accretion tectonics and the amalgamation of composite terranes ( approximately 1880-1870 Ma), (2) development of a "Mediterranean-style" marginal basin ( approximately 1850-1840 Ma Kisseynew "basin") (3) collision with the Archean Sask craton at approximately 1840 Ma, (4) oblique collision with Superior craton at approximately 1810-1800 Ma, partitioned into sinistral strike-slip motion and westward thrusting of Superior crust (Superior Boundary Zone) over the Reindeer Zone, and (5) post-collisional, intracontinental shortening and longitudinal extension of THO, involving the development of crustal and Moho detachments and generating strong reflectors. The geometry of the Superior Boundary Zone is consistent with the subduction-to-collision evolution predicted by geodynamic models of collisional orogens, with a variably preserved east-verging thrust belt on the Superior margin overprinted during terminal continental collision by a zone of transpression marked by Superior-side-up steep reverse faults, periclinal folds and a boundary-parallel strike-slip fault zone. Major features at depth include regionally-extensive, subhorizontal Moho reflections, Moho topography, upper mantle reflectivity, and complexity in lithospheric mantle velocity structure, giving rise to shallow mantle high velocity zones. Significant crustal thickness variations occur across THO, in some cases apparently linked to major changes in surface geologic domain and in other cases apparently unrelated to surface or shallow crustal structure. Mantle discontinuities, defined by wide-angle reflections at offsets beyond 400 km, are recognized at average depths of about 75 and 158 km and appear to bound a layered zone with variable velocities.
DE: accretion-; Canada-; Canadian-Shield; crust-; crustal-shortening; displacements-; faults-; four-dimensional-models; geometry-; Hearne-Craton; high-velocity-zones; Hudsonian-Orogeny; Manitoba-; mantle-; Mohorovicic-discontinuity; North-America; orogenic-belts; paleomagnetism-; Paleoproterozoic-; partitioning-; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; reflection-; reverse-faults; Sask-Craton; Saskatchewan-; strike-slip-faults; Superior-Province; tectonics-; thickness-; upper-mantle; upper-Precambrian; variations-; velocity-; Western-Canada
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-33597
UD: 199912

Author:
Lucas-S; Hajnal-Z; White-D; Bleeker-W; Ansdell-K

Title:
Crustal growth and continental collisions in the 1.9-1.8 Ga Trans-Hudson Orogen (Manitoba and Saskatchewan).

Keywords:
accretion-; Canada-; Canadian-Shield; crust-; crustal-shortening; displacements-; faults-; four-dimensional-models; geometry-; Hearne-Craton; high-velocity-zones; Hudsonian-Orogeny; Manitoba-; mantle-; Mohorovicic-discontinuity; North-America; orogenic-belts; paleomagnetism-; Paleoproterozoic-; partitioning-; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; reflection-; reverse-faults; Sask-Craton; Saskatchewan-; strike-slip-faults; Superior-Province; tectonics-; thickness-; upper-mantle; upper-Precambrian; variations-; velocity-; Western-Canada

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 46. 1998.


Citation_Text:
TI: The architecture of late Archean crust, western Superior Province, Canada; preliminary results from Lithoprobe continental reflection profiling.
AU: White-Don; Helmstaedt-H; Thurston-P; van-der-Velden-A; Hall-K; Davis-D
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 159. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The Superior Province of North America is the world's largest preserved block of Archean lithosphere, and thus provides an ideal laboratory for studying Archean lithospheric evolution. A wide range of genetic models have been proposed for the region, including the first proposed arc-tectonic model for the Archean. Subsequently, more refined models have been proposed where oceanic crust, island arcs, sedimentary prisms and older continental fragments were accreted successively against the southern margin of a >3.0 Ga cratonic nucleus during ca. 2.7 Ga orogeny. In the fall of 1997, LITHOPROBE acquired 800 km of 32s vibroseis reflection data along a N-S corridor across the Western Superior Transect area, to complement two major, orthogonal seismic refraction profiles collected in 1996. Together these seismic datasets complement supporting geological research by survey organizations and academics, which to date has made significant steps towards understanding the timing and structure of key areas in the Western Superior region. We will briefly review the mandate and key results of Lithoprobe to date, overview the preliminary results from seismic reflection profiling, and provide a framework for ongoing studies in the region.
DE: Archean-; Canadian-Shield; crust-; data-acquisition; geophysical-methods; geophysical-profiles; geophysical-surveys; island-arcs; Lithoprobe-; lithosphere-; models-; North-America; oceanic-crust; orogeny-; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; stratigraphic-wedges; Superior-Province; surveys-; upper-Archean; Vibroseis-
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-32581
UD: 199912

Author:
White-Don; Helmstaedt-H; Thurston-P; van-der-Velden-A; Hall-K; Davis-D

Title:
The architecture of late Archean crust, western Superior Province, Canada; preliminary results from Lithoprobe continental reflection profiling.

Keywords:
Archean-; Canadian-Shield; crust-; data-acquisition; geophysical-methods; geophysical-profiles; geophysical-surveys; island-arcs; Lithoprobe-; lithosphere-; models-; North-America; oceanic-crust; orogeny-; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; stratigraphic-wedges; Superior-Province; surveys-; upper-Archean; Vibroseis-

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 159. 1998.


Citation_Text:
TI: Electrical conductivity and Precambrian tectonics.
AU: Boerner-David-E; Bailey-R-C; Craven-J-A; Jones-A-G; Ferguson-I-J; McNeice-G-W; Jones-F-Walter; Wright-J-A
AF: Geological Survey of Canada, Ottawa, ON, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 161. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: Enhanced electrical conductivity, when genetically linked to a particular geological process, can be a sensitive indicator of the conditions defining ancient orogenesis. At orogen scale, concentration of conductive minerals within one particular region is admitted by only a few distinct geological events. One important mechanism for generating conductive formations is the metamorphism of euxinic sediments, such as those deposited in foreland basin environments. That foreland basins have remained conductive since the Precambrian implies an initially high carbon productivity (or low consumption) and low energy sedimentation with subsequent metamorphism exceeding greenschist grade. Details of the orogenic development are apparent in maps of the conductivity distribution. mostly in the form of consequent sediment dispersal patterns. Depth information, on the other hand, mostly indicates the style and extent of deformation suffered by the basin. However, to exploit the tectonic constraints hidden within models of electrical conductivity distribution requires a thorough understanding of the tectonic setting. Electrical conductivity data from different geological eras represented by the LITHOPROBE transects thus provide important information about the evolving chemistry of the ancient oceans and atmosphere, basin formation mechanisms, marine transgressions and margin destruction during orogenesis.
DE: basins-; carbon-; clastic-rocks; depositional-environment; electrical-conductivity; foreland-basins; Lithoprobe-; low-energy-environment; mechanism-; metamorphism-; orogeny-; Precambrian-; processes-; productivity-; sea-level-changes; sedimentary-rocks; sedimentation-; shale-; tectonics-; transgression-
CC: 16-Structural-geology
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-32574
UD: 199912

Author:
Boerner-David-E; Bailey-R-C; Craven-J-A; Jones-A-G; Ferguson-I-J; McNeice-G-W; Jones-F-Walter; Wright-J-A

Title:
Electrical conductivity and Precambrian tectonics.

Keywords:
basins-; carbon-; clastic-rocks; depositional-environment; electrical-conductivity; foreland-basins; Lithoprobe-; low-energy-environment; mechanism-; metamorphism-; orogeny-; Precambrian-; processes-; productivity-; sea-level-changes; sedimentary-rocks; sedimentation-; shale-; tectonics-; transgression-


Citation_Text:
TI: Granite-greenstone belt formation and accretion in the south-eastern Superior Province.
AU: Ludden-John-N
AF: CRPG-CNRS, Vandoevre-les-Nancy, France
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 45. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The LITHOPROBE project completed a comprehensive study along a corridor across southeastern Superior Province including the Pontiac sedimentary subprovince the Abitibi greenstone belt, and Opatica plutonic belt (OPB). The results provides a unique three dimensional image of late-Archean crust. A suture-zone, imaged by seismic reflection, penetrates to mantle depths of 70 km or more and defines a zone along which the Abitibi lithologies dip underneath the OPB (Calvert et al., 1995, Nature, 375, 670-674). This suture can be traced as a lower crustal detachment below the Abitibi greenstone belt. Correlation of the seismic images in the northern Abitibi greenstone belt with the crustal section exposed in the Kapuskasing uplift show that the crust is divided into three main units: upper crust comprising supracrustal assemblages which are largely allochthonous, mid-crust comprising tonalite gneiss and paragneiss, and a layered mafic lower crust. Metasedimentary series such as the Quetico and the Pontiac can be traced into imbricated structures underneath the supracrustal rocks, implying that these sequences were part of the accretionary process. Accretion in the southern Superior province was rapid, and followed by a period of up to 300 Ma of conversion into continental crust. The lowermost crust units, north of the mantle suture-zone, show high reflectivity and deformational structures which were acquired in the during accretion at 2.7 to 2.65 Ga. In contrast, although less reflective, structures defined by reflectivity in lowermost crust of the Abitibi greenstone belt overprint older structures indicating a younger, probable post-accretion age, which is supported by studies of crustal xenoliths (Moser and Heamann, 1997, Contrib. Min. Petrol. 128, 164-175) that indicate a late thermal or magmatic overprint in the lower Abitibi crust. In the late Archean, extensive melting and accretion of hot, immature, thick mafic crust may have resulted in conditions favourable for its preservation that have only occurred on rare occasions since this period. Nonetheless, the exposures of crust in the southern Superior province define a gross andesitic-dacitic composition and appear similar to modern accreted arc sequences. If the south-eastern Superior province formed by accretion of mafic material, it were largely eroded by crustal recycling involving the loss of an ultramafic component.
DE: Abitibi-Belt; accretion-; Archean-; Canadian-Shield; continental-crust; crust-; decollement-; deformation-; granites-; greenstone-belts; igneous-rocks; Kapuskasing-Zone; Lithoprobe-; melting-; metamorphic-belts; metamorphic-rocks; North-America; Opatica-plutonic-belt; plutonic-rocks; Pontiac-Subprovince; Precambrian-; Superior-Province; supracrustals-; ultramafics-; upper-Archean; upper-crust
CC: 05A-Igneous-and-metamorphic-petrology; 16-Structural-geology
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-32559
UD: 199912

Title:
Granite-greenstone belt formation and accretion in the south-eastern Superior Province.

Keywords:
Abitibi-Belt; accretion-; Archean-; Canadian-Shield; continental-crust; crust-; decollement-; deformation-; granites-; greenstone-belts; igneous-rocks; Kapuskasing-Zone; Lithoprobe-; melting-; metamorphic-belts; metamorphic-rocks; North-America; Opatica-plutonic-belt; plutonic-rocks; Pontiac-Subprovince; Precambrian-; Superior-Province; supracrustals-; ultramafics-; upper-Archean; upper-crust

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 45. 1998.


Citation_Text:
TI: Reflections on assembly of western Laurentia.
AU: Ross-Gerald-M; Eaton-David-W; Boerner-David-E
AF: Geological Survey of Canada, Calgary, AB, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 46. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: In a series of breakthrough papers, Paul Hoffman postulated that Laurentia, the cratonic nucleus of North America, was a mosaic of crustal domains that amalgamated through multicollisional assembly, primarily in the interval 2.00-1.78 Ga. Although buried by sedimentary cover, recent results from Lithoprobe seismic profiles, potential-field data, and electrical conductivity studies in western Canada provide new, plate-scale perspectives on the subsurface geometry and evolution of the lithosphere comprising western Laurentia. Tectonic boundary conditions (e.g., subduction polarity and tectonic escape vs. entrapment) exerted first-order controls on orogenic styles and thermal structure and also controlled the fate of pre-collisional Archean crust involved in the amalgamation process. Tectonic escape at the leading edge of the rheologically strong Slave indentor was accommodated along the Great Slave Lake transform, in a fashion geometrically analogous to the modern Indo-Eurasian collision. South of the transform, a complex series of collapsed marginal basins and subduction systems accommodated accretion of tracts of Proterozoic crust to the Archean Rae Province. The southern boundary of this accretionary system was a marginal basin within the Snowbird Tectonic Zone, which acted as a tectonic free-face along the northwest Hearne Province. Eventual closure of the free-face led to tectonic confinement of the Archean Hearne Province, trapped in a tectonic vise between coeval zones opposing convergence: a ca. 1.8 Ga subduction system (Snowbird Tectonic Zone) and terminal collision of the Trans-Hudson orogen in the east. Entrapment of the Hearne between opposing buoyant subduction zones led to wholesale Proterozoic deformation of the Archean crust. EM studies indicate that this deformation likely extended into the lithospheric mantle, a proposition that currently is being tested by teleseismic studies. The conjoined Wyoming Craton-Medicine Hat Block microcontinent, a relatively small and cold (?) tectonic block that was caught up in this assembly process, was affected by local intraplate collisions (a la modern Pyrenees) associated with wholesale accretion and tectonic interleaving.
DE: accretion-; boundary-conditions; Canada-; Canadian-Shield; Churchill-Province; crust-; deformation-; geometry-; geophysical-profiles; Hearne-Province; Hudsonian-Orogeny; Laurentia-; Lithoprobe-; lithosphere-; Medicine-Hat-Block; microcontinents-; North-America; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; Rae-Province; rheology-; seismic-profiles; Slave-Province; Snowbird-tectonic-zone; upper-Precambrian; Western-Canada; Wyoming-Craton
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-32517
UD: 199912

Title:
Reflections on assembly of western Laurentia.

Keywords:
accretion-; boundary-conditions; Canada-; Canadian-Shield; Churchill-Province; crust-; deformation-; geometry-; geophysical-profiles; Hearne-Province; Hudsonian-Orogeny; Laurentia-; Lithoprobe-; lithosphere-; Medicine-Hat-Block; microcontinents-; North-America; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; Rae-Province; rheology-; seismic-profiles; Slave-Province; Snowbird-tectonic-zone; upper-Precambrian; Western-Canada; Wyoming-Craton


Citation_Text:
TI: Adjustment of the orogenic wedge in the Ontario-Quebec Grenville; evidence from Lithoprobe.
AU: Hynes-Andrew
AF: McGill University, Department of Earth and Planetary Sciences, Montreal, PQ, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 46. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The Grenville orogeny in Ontario and Quebec resulted in widespread crustal thickening superposed on an Archean and Paleoproterozoic northwestern foreland and a stack of younger allochthons. The orogeny probably resulted from continental collision, with a suture to the SE, currently obscured by the Appalachian orogen. Faults and shear zones at the surface are generally SE-dipping, and seismic-reflection surveys provide clear evidence for their propagation through the entire crust. Crustal thickening during the Grenville orogeny was episodic, with the earliest shortening events at approximately 1190 Ma. In several places, rocks deformed and metamorphosed at >50 km have later been transported to high structural levels. This can be achieved through basal accretion, but synchronous thrust faulting beneath and normal faulting above the best-developed such unit, in the Manicouagan Imbricate Zone of eastern Quebec, suggests it was extruded. In the Manicouagan region, 3-D interpretation of the Lithoprobe reflection data indicates a steep lateral ramp in the subsurface outboard of the Manicouagan Imbricate Zone, up which extrusion may have occurred. Retrodeformation of the eastern-Quebec section shows that after extrusion, at approximately 1020 Ma, the Moho was approximately flat, at a depth of approximately 50 km. The extrusion may have been related to detachment and subsidence of the upper mantle from the zone of crustal thickening. It is synchronous with widespread extensional deformation in Ontario. The crust was again thickened, to as much as 70 km, in an event culminating at approximately 990 Ma. This involved forward propagation of faults into underlying Archean and Paleoproterozoic rocks which, even after the shortening, extend up to 300 km south of the Grenville Front in the subsurface. The Ontario-Quebec Grenville appears to preserve one side of a crustal-thickening zone analogous to the Tibetan plateau and provides compelling evidence for the kinds of process that may be expected in the deep crust there.
DE: allochthons-; Archean-; Canada-; crust-; crustal-shortening; crustal-thickening; decollement-; deformation-; Eastern-Canada; extension-tectonics; faults-; geophysical-methods; geophysical-surveys; Grenville-Front; Grenvillian-Orogeny; imbricate-tectonics; Lithoprobe-; normal-faults; Ontario-; plate-collision; plate-tectonics; Precambrian-; processes-; Proterozoic-; Quebec-; reflection-methods; seismic-methods; shear-zones; surveys-; tectonics-; thrust-faults; upper-Precambrian
CC: 16-Structural-geology; 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-17331
UD: 199906

Title:
Adjustment of the orogenic wedge in the Ontario-Quebec Grenville; evidence from Lithoprobe.

Keywords:
allochthons-; Archean-; Canada-; crust-; crustal-shortening; crustal-thickening; decollement-; deformation-; Eastern-Canada; extension-tectonics; faults-; geophysical-methods; geophysical-surveys; Grenville-Front; Grenvillian-Orogeny; imbricate-tectonics; Lithoprobe-; normal-faults; Ontario-; plate-collision; plate-tectonics; Precambrian-; processes-; Proterozoic-; Quebec-; reflection-methods; seismic-methods; shear-zones; surveys-; tectonics-; thrust-faults; upper-Precambrian


Citation_Text:
TI: Nain-Superior collision and the tectonic evolution of the southeastern Churchill Province, Labrador-Quebec.
AU: Wardle-Richard-J; Scott-David; Hall-Jeremy
AF: Newfoundland Department Mines and Energy, Geological Survey, St. John's, NF, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 45. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: An integral part of the construction of the NE Canadian-Greenland shield was the ca 1.86-1.8 Ga collision of the Nain and Superior cratons to form the Southeastern Churchill Province (SECP). Lithoprobe work has focused on the eastern margin of this belt where the internal Archean core zone of SECP is sutured to the Nain craton by a narrow belt of juvenile crust referred to as the Torngat Orogen. TO development comprised: ca 1.91 Ga subduction under the Nain craton; ca 1.86 Ga initial collision of the Nain craton, arc/trench elements and the core zone; ca 1.845-1.82 Ga sinistral shear; and finally 1.8-1.74 Ga eastwards-directed thrusting and exhumation of the orogen core, possibly as a far-field response to Superior craton collision and final SECP assembly. The result is a narrow, 50 km-wide orogen exhumed from mid- lower- crustal depths with a fan-shaped structural profile resulting from superimposed transcurrent and thrust-dominated tectonic styles. The orogen represents extreme shortening and excision of juvenile crust such that in the south, and probably at depth elsewhere, the bounding Archean blocks (Nain craton and core zone) are almost in contact. The principal remaining juvenile component is a linear belt of meta-flysch representing part of an accretionary prism. Magmatic arc rocks are preserved only in the north and elsewhere appear to have been tectonically removed, possibly by the process of plug uplift predicted by geodynamical modeling. Seismic profiling indicates a 50 km-deep crustal root under the orogen axis. The preservation of this root, coupled with a paucity of post-collisional granitoids, suggests that post-collisional delamination and asthenospheric up welling either did not occur, or that the lower crust was in some way insulated from these processes. Lack of post-collisional granites is a feature of other Paleoproterozoic orogens in the NE shield--is this a function of the (refractory?) Archean lithosphere that largely underlies these orogens?.
DE: Archean-; Arctic-region; Canada-; Canadian-Shield; Churchill-Province; crust-; Eastern-Canada; geodynamics-; geophysical-profiles; Greenland-; Labrador-; Lithoprobe-; lithosphere-; models-; Nain-Province; Newfoundland-; North-America; Paleoproterozoic-; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; Quebec-; seismic-profiles; Superior-Province; tectonics-; Torngat-Orogeny; upper-Precambrian
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-17282
UD: 199906

Title:
Nain-Superior collision and the tectonic evolution of the southeastern Churchill Province, Labrador-Quebec.

Keywords:
Archean-; Arctic-region; Canada-; Canadian-Shield; Churchill-Province; crust-; Eastern-Canada; geodynamics-; geophysical-profiles; Greenland-; Labrador-; Lithoprobe-; lithosphere-; models-; Nain-Province; Newfoundland-; North-America; Paleoproterozoic-; plate-collision; plate-tectonics; Precambrian-; Proterozoic-; Quebec-; seismic-profiles; Superior-Province; tectonics-; Torngat-Orogeny; upper-Precambrian


Citation_Text:
TI: Crustal growth in the Archean Superior Craton.
AU: Stevenson-Ross; Henry-P; Gariepy-C
AF: Universite Montreal, GEOTOP, Montreal, PQ, Canada
BK: In: Geological Society of America, 1998 annual meeting.
BA: Anonymous
SO: Abstracts with Programs - Geological Society of America. 30; 7, Pages 206-207. 1998.
PB: Geological Society of America (GSA). Boulder, CO, United States. 1998.
CP: United-States
PY: 1998
CN: Geological Society of America, 1998 annual meeting. Toronto, ON, Canada. Oct. 26-29, 1998.
LA: English
AB: The Superior Craton of North America represents one of the largest and best preserved tracts of Late Archean (2.7-3.1 Ga) crust. Recent efforts under the auspices of the Canadian Lithoprobe Program have greatly advanced our understanding of the growth of this crust.Nd isotopes have been used to trace the evolution of this craton and a number of important observations can be made with respect to the growth of Archean crust. The earliest volcanic sequences have isotopic compositions consistent with derivation from a depleted mantle. However, there is increasing evidence for contamination of volcanic rocks in younger greenstone belts suggesting that crust is recycled from one orogenic episode to the next, much like present day continents. The degree of recycling increases as the craton grows in size. More intriguing is evidence in sedimentary, plutonic and volcanic units for contamination by crust which exceeds the oldest known ages (ca 3.1 Ga) preserved in the Superior Province. This is supported by old detrital zircons found in the sedimentary units and scattered isotopic signatures in excess of 3.2 Ga. Thus, the Superior Craton preserves the signature of older eroded cratons, but the amount of this material is small and quickly swamped by the addition of new crust at ca. 2.7 Ga. Basalt and gabbro compositions from the Superior Province indicate that it was underlain by a depleted mantle and komatiitic compositions imply depletion to significant depths (400 km). Post-tectonic intrusives record both recycling of old crust and the addition of new crust. Anatectic granites are evidence of a mature differentiated crust, however the isotopic and geochemical data for Archean sanukitoid suites indicate a continued strong mantle contribution to the craton long after accretion had subsided. The Archean sanukitoids (light-REE enriched dioritic-monzodiorite-granodiorite suites) represent a significant addition (10%) of new crust and may represent products of lithospheric delamination following the subduction process that led to accretion.
DE: accretion-; Archean-; Canadian-Shield; crust-; delamination-; differentiation-; diorites-; granites-; granodiorites-; igneous-rocks; komatiite-; magma-contamination; metals-; monzodiorite-; North-America; orogeny-; plate-tectonics; plutonic-rocks; Precambrian-; processes-; rare-earths; subduction-; subsidence-; Superior-Craton; Superior-Province; ultramafics-; upper-Archean
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
IS: 0016-7592
CO: GAAPBC
AN: 99-17266
UD: 199906

Title:
Crustal growth in the Archean Superior Craton.

Keywords:
accretion-; Archean-; Canadian-Shield; crust-; delamination-; differentiation-; diorites-; granites-; granodiorites-; igneous-rocks; komatiite-; magma-contamination; metals-; monzodiorite-; North-America; orogeny-; plate-tectonics; plutonic-rocks; Precambrian-; processes-; rare-earths; subduction-; subsidence-; Superior-Craton; Superior-Province; ultramafics-; upper-Archean

Issue:
Abstracts with Programs - Geological Society of America. 30; 7, Pages 206-207. 1998.


Citation_Text:
TI: Paleoseismological evidence from lake sediments for Recent movement on the Denali and other faults, Yukon Territory, Canada.
AU: Doig-Ronald
AF: McGill University, Department of Earth and Planetary Sciences, Montreal, PQ, Canada
SO: Tectonophysics. 296; 3-4, Pages 363-370. 1998.
PB: Elsevier. Amsterdam, Netherlands. 1998.
CP: Netherlands
PY: 1998
LA: English
AB: Most of the Pacific-North America plate motion in northwestern Canada and southeastern Alaska occurs along coastal faults that are the inland extension of the Queen Charlotte dextral transform fault. More ancient faults farther east, such as the Denali and Duke River faults, exhibit moderate earthquake activity and may be accommodating part of the Pacific plate motion. Paleoseismological results based on seismic resuspension of lake sediments, covering a period of up to 3000 years, show that the seismicity on the Denali-Duke River fault system is remarkably recent, spanning just the last three to five centuries. There is a northerly-trending zone of seismicity from the active Fairweather-Contact fault system on the coast, across to the part of the Denali fault that is currently, as well as prehistorically, active. This partial transfer eastward of Pacific plate motion may be analogous to a similar proposed transfer of motion northward to the Denali fault from the same Fairweather-Contact fault system, farther west in Alaska.
DE: accommodation-zones; active-faults; Canada-; Cenozoic-; Denali-Fault; earthquakes-; faults-; Holocene-; lake-sediments; Lithoprobe-; magnitude-; movement-; North-America; North-American-Plate; Pacific-Plate; paleoseismicity-; plate-tectonics; Quaternary-; Queen-Charlotte-Fault; sediments-; seismotectonics-; strike-slip-faults; tectonics-; Tintina-Fault; transfer-faults; transform-faults; upper-Holocene; Western-Canada; Yukon-Territory
CC: 24-Quaternary-geology; 19-Seismology
DT: Serial
BL: Analytic
NN: Lithoprobe Contrib. No. 896.
IL: Refs: 23; illus. incl. sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
IS: 0040-1951
CO: TCTOAM
AN: 99-13917
UD: 199905

Title:
Paleoseismological evidence from lake sediments for Recent movement on the Denali and other faults, Yukon Territory, Canada.

Keywords:
accommodation-zones; active-faults; Canada-; Cenozoic-; Denali-Fault; earthquakes-; faults-; Holocene-; lake-sediments; Lithoprobe-; magnitude-; movement-; North-America; North-American-Plate; Pacific-Plate; paleoseismicity-; plate-tectonics; Quaternary-; Queen-Charlotte-Fault; sediments-; seismotectonics-; strike-slip-faults; tectonics-; Tintina-Fault; transfer-faults; transform-faults; upper-Holocene; Western-Canada; Yukon-Territory


Citation_Text:
TI: Seismic reflection and borehole geophysical investigations in the Matagami mining camp.
AU: Adam-Erick; Milkereit-Bernd; Mareschal-Marianne
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 6, Pages 686-695. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: A high-frequency vibroseis seismic survey was conducted by Lithoprobe across a well-known section of the Matagami mining camp to assess the usefulness of seismic methods in lithological mapping. The data have been reprocessed to enhance shallow reflections. Critical processing steps for the preservation of the shallow features include refraction static corrections, cross-dip corrections, and first break mutes. The seismic data were calibrated using geophysical logs from two boreholes adjacent to the profile. Physical rock property measurements suggest that strong reflectivity within the volcanic sequence occurs at rhyolite-gabbro contacts. The Lower Wabassee Group, a sequence of gabbros and basalts with interlayered rhyolite horizons, has been identified as a seismic marker. This reflective package overlays the horizon where most sulphide deposits are known to be located. In the Matagami mining camp, seismic reflection methods can be used to map the deep volcanic stratigraphy and structures.
DE: Abitibi-Belt; applications-; Archean-; calibration-; Canada-; Canadian-Shield; continental-crust; crust-; Eastern-Canada; geophysical-methods; geophysical-surveys; Lithoprobe-; marker-beds; Matagami-; metaigneous-rocks; metamorphic-rocks; North-America; physical-properties; Precambrian-; Quebec-; reflection-methods; rock-mechanics; seismic-methods; seismic-stratigraphy; stratigraphic-units; Superior-Province; surveys-; velocity-structure; Vibroseis-; Wabassee-Group; well-logging
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
MC: LAT: N494000; N495000; LONG: W0773500; W0774500.
NN: Lithoprobe Publ. No. 988; Geol. Surv. Can., Contrib. No. 1997158.
IL: Refs: 30; illus. incl. sects., 1 table, geol. sketch map.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 99-12098
UD: 199905

Title:
Seismic reflection and borehole geophysical investigations in the Matagami mining camp.

Keywords:
Abitibi-Belt; applications-; Archean-; calibration-; Canada-; Canadian-Shield; continental-crust; crust-; Eastern-Canada; geophysical-methods; geophysical-surveys; Lithoprobe-; marker-beds; Matagami-; metaigneous-rocks; metamorphic-rocks; North-America; physical-properties; Precambrian-; Quebec-; reflection-methods; rock-mechanics; seismic-methods; seismic-stratigraphy; stratigraphic-units; Superior-Province; surveys-; velocity-structure; Vibroseis-; Wabassee-Group; well-logging

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 6, Pages 686-695. 1998.


Citation_Text:
TI: Wide-angle seismic imaging of pristine Archean crust in the Nain Province, Labrador.
AU: Funck-Thomas; Louden-Keith-E
AF: Dalhousie University, Department of Oceanography, Halifax, NS, Canada
SO: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 6, Pages 672-685. 1998.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1998.
CP: Canada
PY: 1998
LA: English
LS: French
AB: A detailed refraction--wide-angle reflection seismic experiment was carried out in northern Labrador to determine the velocity structure of relatively unaltered Archean crust in the Nain Province. Six 3-component land seismometers were used to record an airgun source along a profile parallel to the coast. Forward modeling of traveltimes and amplitudes yields a P- and S-wave velocity model that shows two crustal blocks separated by a fault. Magnetic data suggest, but do not prove, that the fault is the offshore continuation of the Handy fault. A southwards thickening of the lower crust across the fault indicates that a transcurrent component might have been associated with the faulting. The total crustal thickness is 33 km to the north and 38 km to the south of the fault. The presence of P (sub m) S reflections imply a sharp transition at the Moho. Upper crustal velocities of 5.8-6.3 km/s and Poisson's ratios of 0.20 and 0.24, north and south of the fault respectively, are consistent with a gneissic composition, but suggest a higher quartz content in the northern block. Velocities in the middle crust increase to 6.5 km/s, where a discontinuity at a depth between 16 and 18 km marks the transition to the lower crust with velocities between 6.6 and 6.9 km/s. Poisson's ratios of 0.24 and 0.26 indicate, respectively, a felsic middle crust and an intermediate composition for the lower crust. The absence of a high-velocity basal layer is in accordance with other examples of Archean crust.
DE: Archean-; block-structures; body-waves; Canadian-Shield; crust-; data-acquisition; data-processing; elastic-waves; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; Mohorovicic-discontinuity; Nain-Province; North-America; northern-Labrador; P-waves; Precambrian-; reflection-methods; refraction-methods; S-waves; seismic-methods; seismic-profiles; seismic-waves; surveys-; systems-; thickness-; two-dimensional-models; velocity-structure; vertical-seismic-profiles
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 931.
IL: Refs: 36; illus. incl. sects., 1 table, sketch maps.
RF: GeoRef, Copyright 1999, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 99-12097
UD: 199905

Title:
Wide-angle seismic imaging of pristine Archean crust in the Nain Province, Labrador.

Keywords:
Archean-; block-structures; body-waves; Canadian-Shield; crust-; data-acquisition; data-processing; elastic-waves; faults-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; Mohorovicic-discontinuity; Nain-Province; North-America; northern-Labrador; P-waves; Precambrian-; reflection-methods; refraction-methods; S-waves; seismic-methods; seismic-profiles; seismic-waves; surveys-; systems-; thickness-; two-dimensional-models; velocity-structure; vertical-seismic-profiles

Issue:
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre. 35; 6, Pages 672-685. 1998.


Citation_Text:
TI: Use of regional magnetic data in the SNORCLE area; examples from the Slave Province.
AU: Bird-Robert-T; Pilkington-Mark; Roest-Walter-R
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
BK: In: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; report of the 1997 combined meeting.
BA: Cook-F-A (chairperson); Erdmer-Philippe (chairperson)
SO: Lithoprobe Report. 56; Pages 38-40. 1997.
PB: University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. Vancouver, BC, Canada. 1997.
CP: Canada
PY: 1997
CN: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; 1997 combined meeting. Calgary, AB, Canada. Mar. 7-9, 1997.
LA: English
DE: airborne-methods; Canada-; Canadian-Shield; dike-swarms; geophysical-methods; geophysical-surveys; gravity-methods; image-enhancement; Mackenzie-dikes; magnetic-anomalies; magnetic-field; magnetic-methods; new-data; North-America; Slave-Province; SNORCLE-; surveys-; tectonics-; topography-
CC: 20-Applied-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
IL: Refs: 5; sketch maps.
RF: GeoRef, Copyright 1998, American Geological Institute.
CO: #03834
AN: 98-38630
UD: 199816

Title:
Use of regional magnetic data in the SNORCLE area; examples from the Slave Province.

Keywords:
airborne-methods; Canada-; Canadian-Shield; dike-swarms; geophysical-methods; geophysical-surveys; gravity-methods; image-enhancement; Mackenzie-dikes; magnetic-anomalies; magnetic-field; magnetic-methods; new-data; North-America; Slave-Province; SNORCLE-; surveys-; tectonics-; topography-

Issue:
Lithoprobe Report. 56; Pages 38-40. 1997.

Publisher:
University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. Vancouver, BC, Canada. 1997.


Citation_Text:
TI: The Slave Province: evidence for contrasting crustal domains and a complex, multistage tectonic evolution.
AU: Bleeker-Wouter; Davis-Bill; Villeneuve-Mike
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
BK: In: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; report of the 1997 combined meeting.
BA: Cook-F-A (chairperson); Erdmer-Philippe (chairperson)
SO: Lithoprobe Report. 56; Pages 36-37. 1997.
PB: University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. Vancouver, BC, Canada. 1997.
CP: Canada
PY: 1997
CN: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; 1997 combined meeting. Calgary, AB, Canada. Mar. 7-9, 1997.
LA: English
DE: Archean-; basins-; Burwash-Formation; Canadian-Shield; cratons-; crust-; deformation-; dikes-; evolution-; intrusions-; metamorphic-rocks; models-; North-America; plate-collision; plate-tectonics; Precambrian-; rifting-; Slave-Province; supracrustals-; tectonics-; terranes-; turbidite-
CC: 18-Solid-earth-geophysics
DT: Abstract; Serial; Conference-Document
BL: Analytic
IL: chart.
RF: GeoRef, Copyright 1998, American Geological Institute.
CO: #03834
AN: 98-38629
UD: 199816

Title:
The Slave Province: evidence for contrasting crustal domains and a complex, multistage tectonic evolution.

Keywords:
Archean-; basins-; Burwash-Formation; Canadian-Shield; cratons-; crust-; deformation-; dikes-; evolution-; intrusions-; metamorphic-rocks; models-; North-America; plate-collision; plate-tectonics; Precambrian-; rifting-; Slave-Province; supracrustals-; tectonics-; terranes-; turbidite-

Issue:
Lithoprobe Report. 56; Pages 36-37. 1997.


Citation_Text:
TI: The Acasta gneisses; an imperfect sample of Earth's oldest crust.
AU: Bleeker-Wouter; Stern-Richard
AF: Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
BK: In: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; report of the 1997 combined meeting.
BA: Cook-F-A (chairperson); Erdmer-Philippe (chairperson)
SO: Lithoprobe Report. 56; Pages 32-35. 1997.
PB: University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. Vancouver, BC, Canada. 1997.
CP: Canada
PY: 1997
CN: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; 1997 combined meeting. Calgary, AB, Canada. Mar. 7-9, 1997.
LA: English
DE: absolute-age; Archean-; banded-gneiss; Canadian-Shield; dates-; gneisses-; intrusions-; lower-Archean; metamorphic-rocks; metamorphism-; North-America; polymetamorphism-; Precambrian-; SHRIMP-data; Slave-Province; tonalite-gneiss; U-Pb
CC: 03-Geochronology
DT: Abstract; Serial; Conference-Document
BL: Analytic
IL: Refs: 20; illus.
RF: GeoRef, Copyright 1998, American Geological Institute.
CO: #03834
AN: 98-38628
UD: 199816

Title:
The Acasta gneisses; an imperfect sample of Earth's oldest crust.

Keywords:
absolute-age; Archean-; banded-gneiss; Canadian-Shield; dates-; gneisses-; intrusions-; lower-Archean; metamorphic-rocks; metamorphism-; North-America; polymetamorphism-; Precambrian-; SHRIMP-data; Slave-Province; tonalite-gneiss; U-Pb

Issue:
Lithoprobe Report. 56; Pages 32-35. 1997.


Citation_Text:
TI: Systematic U-Pb geochronological study of Slave Province "basement" rocks along the SNORCLE Lithoprobe transect; preliminary results.
AU: Ketchum-John; Bleeker-Wouter
AF: Memorial University, Department of Earth Sciences, Saint John's, NF, Canada
BK: In: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; report of the 1997 combined meeting.
BA: Cook-F-A (chairperson); Erdmer-Philippe (chairperson)
SO: Lithoprobe Report. 56; Pages 28-31. 1997.
PB: University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. Vancouver, BC, Canada. 1997.
CP: Canada
PY: 1997
CN: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; 1997 combined meeting. Calgary, AB, Canada. Mar. 7-9, 1997.
LA: English
DE: absolute-age; Archean-; basement-; Canadian-Shield; cratons-; dates-; diorites-; geotraverses-; gneisses-; granites-; granodiorites-; igneous-rocks; intrusions-; isotopes-; Lithoprobe-; megacrysts-; metagranite-; metaigneous-rocks; metals-; metamorphic-rocks; neodymium-; North-America; plutonic-rocks; plutons-; Precambrian-; rare-earths; Slave-Province; SNORCLE-; supracrustals-; tonalite-; U-Pb; unconformities-; volcanic-rocks
CC: 03-Geochronology
DT: Serial; Conference-Document
BL: Analytic
MC: LAT: N620000; N630000; LONG: W1120000; W1143000.
IL: Refs: 14; geol. sketch maps.
RF: GeoRef, Copyright 1998, American Geological Institute.
CO: #03834
AN: 98-38627
UD: 199816

Title:
Systematic U-Pb geochronological study of Slave Province "basement" rocks along the SNORCLE Lithoprobe transect; preliminary results.

Keywords:
absolute-age; Archean-; basement-; Canadian-Shield; cratons-; dates-; diorites-; geotraverses-; gneisses-; granites-; granodiorites-; igneous-rocks; intrusions-; isotopes-; Lithoprobe-; megacrysts-; metagranite-; metaigneous-rocks; metals-; metamorphic-rocks; neodymium-; North-America; plutonic-rocks; plutons-; Precambrian-; rare-earths; Slave-Province; SNORCLE-; supracrustals-; tonalite-; U-Pb; unconformities-; volcanic-rocks

Issue:
Lithoprobe Report. 56; Pages 28-31. 1997.


Citation_Text:
TI: Late Archean turbidites and their tectonic setting in the southern Slave Province.
AU: Waldron-John-W-F; Bleeker-Wouter
AF: Saint Mary's University, Geology Department, Halifax, NS, Canada
BK: In: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; report of the 1997 combined meeting.
BA: Cook-F-A (chairperson); Erdmer-Philippe (chairperson)
SO: Lithoprobe Report. 56; Pages 21-27. 1997.
PB: University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. Vancouver, BC, Canada. 1997.
CP: Canada
PY: 1997
CN: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; 1997 combined meeting. Calgary, AB, Canada. Mar. 7-9, 1997.
LA: English
DE: aerial-photography; Archean-; basement-; Burwash-Formation; Canadian-Shield; complexes-; correlation-; cratons-; geophysical-profiles; geotraverses-; metamorphic-rocks; models-; North-America; Precambrian-; remote-sensing; sedimentary-structures; seismic-profiles; Slave-Province; SNORCLE-; structural-analysis; submarine-fans; supracrustals-; terranes-; thickness-; turbidite-; Yellowknife-Group
CC: 05A-Igneous-and-metamorphic-petrology
DT: Serial; Conference-Document
BL: Analytic
MC: LAT: N620000; N650000; LONG: W1060000; W1160000.
IL: Refs: 20; illus. incl. sects., geol. sketch map.
RF: GeoRef, Copyright 1998, American Geological Institute.
CO: #03834
AN: 98-38626
UD: 199816

Title:
Late Archean turbidites and their tectonic setting in the southern Slave Province.

Keywords:
aerial-photography; Archean-; basement-; Burwash-Formation; Canadian-Shield; complexes-; correlation-; cratons-; geophysical-profiles; geotraverses-; metamorphic-rocks; models-; North-America; Precambrian-; remote-sensing; sedimentary-structures; seismic-profiles; Slave-Province; SNORCLE-; structural-analysis; submarine-fans; supracrustals-; terranes-; thickness-; turbidite-; Yellowknife-Group

Issue:
Lithoprobe Report. 56; Pages 21-27. 1997.


Citation_Text:
TI: Metamorphism and its relationship to tectonic setting along the SNORCLE transect, Yellowknife Domain, Slave Province, N.W.T.
AU: Bethune-M; Carmichael-D-M; Bleeker-W
AF: Queen's University, Department of Geological Sciences, Kingston, ON, Canada
BK: In: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; report of the 1997 combined meeting.
BA: Cook-F-A (chairperson); Erdmer-Philippe (chairperson)
SO: Lithoprobe Report. 56; Pages 20. 1997.
PB: University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. Vancouver, BC, Canada. 1997.
CP: Canada
PY: 1997
CN: Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) and Cordilleran tectonics workshop; 1997 combined meeting. Calgary, AB, Canada. Mar. 7-9, 1997.
LA: English
DE: accretion-; Ar-Ar; Archean-; aureoles-; Burwash-Formation; Canadian-Shield; diagenesis-; diorites-; geochronology-; geotraverses-; granites-; granodiorites-; igneous-rocks; metamorphic-rocks; metamorphism-; mineral-assemblages; North-America; P-T-conditions; plate-tectonics; plutonic-rocks; Precambrian-; schists-; Slave-Province; SNORCLE-; supracrustals-; textures-; tonalite-; U-Pb; Yellowknife-Domain
CC: 05A-Igneous-and-metamorphic-petrology
DT: Abstract; Serial; Conference-Document
BL: Analytic
RF: GeoRef, Copyright 1998, American Geological Institute.
CO: #03834
AN: 98-38625
UD: 199816

Title:
Metamorphism and its relationship to tectonic setting along the SNORCLE transect, Yellowknife Domain, Slave Province, N.W.T.

Keywords:
accretion-; Ar-Ar; Archean-; aureoles-; Burwash-Formation; Canadian-Shield; diagenesis-; diorites-; geochronology-; geotraverses-; granites-; granodiorites-; igneous-rocks; metamorphic-rocks; metamorphism-; mineral-assemblages; North-America; P-T-conditions; plate-tectonics; plutonic-rocks; Precambrian-; schists-; Slave-Province; SNORCLE-; supracrustals-; textures-; tonalite-; U-Pb; Yellowknife-Domain


Citation_Text:
TI: Delineation of surfaces by skeletonization; application to interpretation of 3-D seismic reflection and georadar data volumes.
AU: Vasudevan-Kris; Tozser-Peter; Cook-Frederick-A
AF: University of Calgary, LITHOPROBE Seismic Processing Facility, Calgary, AB, United States
SO: Geophysical Research Letters. 24; 7, Pages 767-770. 1997.
PB: American Geophysical Union. Washington, DC, United States. 1997.
CP: United-States
PY: 1997
LA: English
DE: electromagnetic-methods; geophysical-methods; radar-methods; reflection-methods; seismic-attributes; seismic-methods; statistical-analysis; three-dimensional-methods
CC: 20-Applied-geophysics
DT: Serial
BL: Analytic
IL: Refs: 4; illus.
RF: GeoRef, Copyright 1998, American Geological Institute.
IS: 0094-8276
CO: GPRLAJ
AN: 97-71989
UD: 199724

Title:
Delineation of surfaces by skeletonization; application to interpretation of 3-D seismic reflection and georadar data volumes.

Keywords:
electromagnetic-methods; geophysical-methods; radar-methods; reflection-methods; seismic-attributes; seismic-methods; statistical-analysis; three-dimensional-methods

Issue:
Geophysical Research Letters. 24; 7, Pages 767-770. 1997.


Citation_Text:
TI: Upper mantle structure in the southeastern Canadian Cordillera.
AU: Burianyk-M-J-A; Kanasewich-E-R
AF: University of Alberta, Edmonton, AB, Canada
SO: Geophysical Research Letters. 24; 7, Pages 739-742. 1997.
PB: American Geophysical Union. Washington, DC, United States. 1997.
CP: United-States
PY: 1997
LA: English
DE: asthenosphere-; body-waves; Canada-; Canadian-Cordillera; elastic-waves; geophysical-methods; geophysical-surveys; heat-sources; kinematics-; Lithoprobe-; lithosphere-; mantle-; North-American-Cordillera; P-waves; reflection-methods; refraction-methods; S-waves; seismic-methods; seismic-waves; Southern-Cordillera-Transect; surveys-; upper-mantle; velocity-structure; Western-Canada
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
MC: LAT: N490000; N520000; LONG: W1140000; W1200000.
IL: Refs: 9; illus. incl. sketch map, sects.
RF: GeoRef, Copyright 1998, American Geological Institute.
IS: 0094-8276
CO: GPRLAJ
AN: 97-71983
UD: 199724

Title:
Upper mantle structure in the southeastern Canadian Cordillera.

Keywords:
asthenosphere-; body-waves; Canada-; Canadian-Cordillera; elastic-waves; geophysical-methods; geophysical-surveys; heat-sources; kinematics-; Lithoprobe-; lithosphere-; mantle-; North-American-Cordillera; P-waves; reflection-methods; refraction-methods; S-waves; seismic-methods; seismic-waves; Southern-Cordillera-Transect; surveys-; upper-mantle; velocity-structure; Western-Canada

Issue:
Geophysical Research Letters. 24; 7, Pages 739-742. 1997.


Citation_Text:
TI: A link between deformation history and the orientation of reflective structures in the 2.68-2.83 Ga Opatica Belt of the Canadian Superior Province.
AU: Bellefleur-G; Calvert-A-J; Chouteau-M-C
AF: Ecole Polytechnique de Montreal, Departement de Genie Mineral, Montreal, PQ, Canada
SO: Journal of Geophysical Research, B, Solid Earth and Planets. 102; 7, Pages 15,243-15,257. 1997.
PB: American Geophysical Union. Washington, DC, United States. 1997.
CP: United-States
PY: 1997
LA: English
DE: Archean-; Canada-; Canadian-Shield; crust-; fabric-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; mantle-; North-America; Opatica-Belt; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; stacking-; subduction-zones; Superior-Province; surveys-
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
IL: Refs: 21; illus. incl. 3 plates, sects., sketch maps.
RF: GeoRef, Copyright 1998, American Geological Institute.
IS: 0885-3401
AN: 97-68903
UD: 199722

Title:
A link between deformation history and the orientation of reflective structures in the 2.68-2.83 Ga Opatica Belt of the Canadian Superior Province.

Keywords:
Archean-; Canada-; Canadian-Shield; crust-; fabric-; geophysical-methods; geophysical-profiles; geophysical-surveys; Lithoprobe-; mantle-; North-America; Opatica-Belt; Precambrian-; reflection-methods; seismic-methods; seismic-profiles; stacking-; subduction-zones; Superior-Province; surveys-

Issue:
Journal of Geophysical Research, B, Solid Earth and Planets. 102; 7, Pages 15,243-15,257. 1997.


Citation_Text:
TI: National Gravity Program of the Geodetic Survey of Canada, 1996-1997.
AU: Gibb-R-A; Hearty-D-B
BK: In: Eastern Canada and national and general programs--Est du Canada et programmes nationaux et generaux.
CA: Canada, Geological Survey,
SO: Current Research - Geological Survey of Canada. Pages 67-70. 1997.
PB: Geological Survey of Canada. Ottawa, ON, Canada. 1997.
CP: Canada
PY: 1997
LA: English
AB: The National Gravity Program has been refocused to meet the needs of the Geodetic Survey Division for a refined geoid model for Canada and the integration of spatial and gravity networks and databases. During 1996, seven gravity surveys were completed: two were reconnaissance surveys of Arctic channels, one located in Nares Strait and the other in Dolphin and Union Strait; and five were detailed surveys of geological targets including the Oak Ridges Moraine, Ontario, the Steen River crater, Alberta, Alberta LITHOPROBE transects, the Western Superior LITHOPROBE transect, and phase 1 of a marine survey of the seaward extension of the Chicxulub crater, Mexico. Totals of 4548 new gravity stations and 3809 line kilometres of marine gravity data were collected during these surveys. The absolute gravity field program was reduced to only six measurements by October 1996 due to instrumentation problems. A three-year plan to develop a refined geoid model for Canada was distributed to stakeholders.
DE: geodesy-; Geodetic-Survey-of-Canada; geophysical-methods; government-agencies; gravity-methods; programs-
CC: 20-Applied-geophysics
DT: Serial; Report
BL: Analytic
RF: GeoRef, Copyright 1998, American Geological Institute. Produced under license from Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources
IS: 0704-2884
IB: 0-660-16731-X
RN: 1997-D
AN: 97-68803
UD: 199722

Title:
National Gravity Program of the Geodetic Survey of Canada, 1996-1997.

Keywords:
geodesy-; Geodetic-Survey-of-Canada; geophysical-methods; government-agencies; gravity-methods; programs-

Issue:
Current Research - Geological Survey of Canada. Pages 67-70. 1997.

Publisher:
Geological Survey of Canada. Ottawa, ON, Canada. 1997.


Citation_Text:
TI: Crustal velocity structure of the Superior and Grenville provinces of the southeastern Canadian Shield.
AU: Winardhi-S; Mereu-R-F
AF: University of Western Ontario, Department of Earth Sciences, London, ON,
SO: Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 34; 8, Pages 1167-1184. 1997.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1997.
CP: Canada
PY: 1997
LA: English
LS: French
AB: The 1992 Lithoprobe Abitibi-Grenville Seismic Refraction Experiment was conducted using four profiles across the Grenville and Superior provinces of the southeastern Canadian Shield. Delay-time analysis and tomographic inversion of the data set demonstrate significant lateral and vertical variations in crustal velocities from one terrane to another, with the largest velocity values occurring underneath the Central Gneiss and the Central Metasedimentary belts south of the Grenville Front. The Grenville Front Tectonic Zone is imaged as a southeast-dipping region of anomalous velocity gradients extending to the Moho. The velocity-anomaly maps suggest an Archean crust may extend, horizontally, 140 km beneath the northern Grenville Province. Near-surface velocity anomalies correlate well with the known geology. The most prominent of these is the Sudbury Structure, which is well mapped as a low-velocity basinal structure. The tomography images also suggest underthrusting of the Pontiac and Quetico subprovinces beneath the Abitibi Greenstone Belt. Wide-angle P (sub m) P signals, indicate that the Moho varies from a sharp discontinuity south of the Grenville Front to a rather diffuse and flat boundary under the Abitibi Greenstone Belt north of the Grenville Front. A significant crustal thinning near the Grenville Front may indicate post-Grenvillian rebound and (or) the extensional structure of the Ottawa-Bonnechere graben. Crustal thickening resulting from continental collision may explain the tomographic images showing the Moho is 4-5 km deeper south of the Grenville Front.
DE: Abitibi-Belt; body-waves; Canada-; Canadian-Shield; continental-crust; crust-; crustal-thickening; Eastern-Canada; elastic-waves; geophysical-profiles; Grenville-Front; Grenville-Province; Lithoprobe-; Mohorovicic-discontinuity; North-America; Ontario-; P-waves; seismic-profiles; seismic-waves; Sudbury-Structure; Superior-Province; tomography-; traveltime-; velocity-structure
CC: 18-Solid-earth-geophysics
DT: Serial
BL: Analytic
NN: Lithoprobe Publ. No. 864.
IL: Refs: 48; sects., 1 table, sketch map.
RF: GeoRef, Copyright 1998, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 97-67746
UD: 199722

Keywords:
Abitibi-Belt; body-waves; Canada-; Canadian-Shield; continental-crust; crust-; crustal-thickening; Eastern-Canada; elastic-waves; geophysical-profiles; Grenville-Front; Grenville-Province; Lithoprobe-; Mohorovicic-discontinuity; North-America; Ontario-; P-waves; seismic-profiles; seismic-waves; Sudbury-Structure; Superior-Province; tomography-; traveltime-; velocity-structure

Issue:
Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 34; 8, Pages 1167-1184. 1997.

Publisher:
National Research Council of Canada. Ottawa, ON, Canada. 1997.


Citation_Text:
TI: Broadside wide-angle seismic studies and three-dimensional structure of the crust in the Southeast Canadian Cordillera.
AU: Burianyk-M-J-A; Kanasewich-E-R; Udey-N
AF: University of Alberta, Seismology Laboratory, Edmonton, AB, Canada
SO: Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 34; 8, Pages 1156-1166. 1997.
PB: National Research Council of Canada. Ottawa, ON, Canada. 1997.
CP: Canada
PY: 1997
LA: English
LS: French
AB: Broadside, or fan, recordings of a Lithoprobe seismic refraction--wide-angle reflection experiment in the southeastern Canadian Cordillera show several features further illuminating the crustal structure beyond that previously derived from SCoRE '90 (Southern Cordillera Refraction Experiment of 1990) in-line data. Analysis of a nearly in-line profile centred on Castlegar, British Columbia, shows lower velocities in the upper crust associated with the Purcell Anticlinorium as well as velocity variations that may have some association with the Purcell fault zone. The depth to Moho is almost 38 km, somewhat deeper and on trend with the structure that has been established farther north. The broadside records show high signal-to-noise ratio P (sub m) P arrivals (i.e., reflections from the bottom of the crust). These P (sub m) P fan picks were analysed in regions away from in-line profiles, providing further measurements of the depth to Moho in the southeastern Cordillera. The analysis of the broadside records combined with the earlier in-line interpretations as well as older crustal seismic measurements make up a relatively high resolution database, compared with most other regions in Canada, from which we have generated maps of depth to Moho and average crustal velocity in the southeastern Cordillera of Canada. The maps show thin, low-velocity crust over much of the region and indicate a high degree of correlation between current crustal seismic properties and regional isotherms.
DE: body-waves; British-Columbia; Canada-; Canadian-Cordillera; continental-crust; crust-; elastic-waves; geophysical-methods; geophysical-surveys; Lithoprobe-; low-velocity-zones; North-America; North-American-Cordillera; P-waves; Purcell-Mountains; reflection-methods; refraction-methods; seismic-methods; seismic-waves; southeastern-British-Columbia; surveys-; three-dimensional-models; velocity-structure; Western-Canada
CC: 18-Solid-earth-geophysics; 20-Applied-geophysics
DT: Serial
BL: Analytic
MC: LAT: N490000; N491500; LONG: W1160000; W1180000.
NN: Lithoprobe Publ. No. 851.
IL: Refs: 23; illus. incl. sects., sketch maps.
RF: GeoRef, Copyright 1998, American Geological Institute.
IS: 0008-4077
CO: CJESAP
AN: 97-67745
UD: 199722

Title:
Broadside wide-angle seismic studies and three-dimensional structure of the crust in the Southeast Canadian Cordillera.

Keywords:
body-waves; British-Columbia; Canada-; Canadian-Cordillera; continental-crust; crust-; elastic-waves; geophysical-methods; geophysical-surveys; Lithoprobe-; low-velocity-zones; North-America; North-American-Cordillera; P-waves; Purcell-Mountains; reflection-methods; refraction-methods; seismic-methods; seismic-waves; southeastern-British-Columbia; surveys-; three-dimensional-models; velocity-structure; Western-Canada

Issue:
Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre. 34; 8, Pages 1156-1166. 1997.


Citation_Text:
TI: Nd isotopic geochemical studies in the Labrador Shield; a progress report and preliminary data from the Churchill (Rae) Province.
AU: Kerr-Andrew; James-Donald-T; Fryer-Brian-J
AF: Geological Survey of Newfoundland and Labrador, Department of Natural Resources, St. John's, NF, Canada
BK: In: Lithoprobe; Eastern Canadian Shield Onshore-Offshore Transect (ECSOOT).
BA: Wardle-Richard-J (editor); Hall-Jeremy (editor)
SO: Lithoprobe Report. 45; Pages 51-62. 1996.
PB: University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. British Columbia, Canada. 1996.
CP: Canada
PY: 1996
CN: Lithoprobe; Eastern Canadian Shield Onshore-Offshore Transect; 1994 transect meeting. Montreal, PQ, Canada. Nov. 28-29, 1994.
LA: English
DE: Canada-; Canadian-Shield; Churchill-Province; Eastern-Canada; genesis-; geotraverses-; granites-; igneous-rocks; isotopes-; Labrador-; Labrador-Shield; major-elements; mantle-; metals-; models-; Nd-144-Nd-143; neodymium-; Newfoundland-; North-America; plutonic-rocks; Precambrian-; Proterozoic-; Rae-Province; rare-earths; stable-isotopes; tectonics-; terranes-; trace-elements; upper-Precambrian
CC: 05A-Igneous-and-metamorphic-petrology
DT: Serial; Conference-Document
BL: Analytic
MC: LAT: N540000; N550000; LONG: W0640000; W0660000.
IL: Refs: 10; illus. incl. geol. sketch map.
RF: GeoRef, Copyright 1998, American Geological Institute.
CO: #03834
AN: 97-73236
UD: 199724

Title:
Nd isotopic geochemical studies in the Labrador Shield; a progress report and preliminary data from the Churchill (Rae) Province.

Keywords:
Canada-; Canadian-Shield; Churchill-Province; Eastern-Canada; genesis-; geotraverses-; granites-; igneous-rocks; isotopes-; Labrador-; Labrador-Shield; major-elements; mantle-; metals-; models-; Nd-144-Nd-143; neodymium-; Newfoundland-; North-America; plutonic-rocks; Precambrian-; Proterozoic-; Rae-Province; rare-earths; stable-isotopes; tectonics-; terranes-; trace-elements; upper-Precambrian

Issue:
Lithoprobe Report. 45; Pages 51-62. 1996.

Publisher:
University of British Columbia, Lithoprobe Secretariat [for the] Canadian Lithoprobe Program. British Columbia, Canada. 1996.


