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TitleReconnaissance geology of a part of the Canadian Shield, northern Quebec and Northwest Territories
DownloadDownloads
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorTaylor, F C
SourceGeological Survey of Canada, Memoir 399, 1982, 32 pages (7 sheets), https://doi.org/10.4095/109241 Open Access logo Open Access
Year1982
PublisherCanada Department of Mines
Documentserial
Lang.English
MapsPublication contains 7 maps
Map Info.geological, 1:250,000
Mediapaper; on-line; digital
RelatedThis publication contains the following publications
File formatpdf
ProvinceQuebec; Nunavut
NTS35F; 35G; 35H; 35I/01; 35I/02; 35I/03; 35I/04; 35I/05; 35I/06; 35I/07; 35I/12; 35J/01; 35J/02; 35J/03; 35J/04; 35J/05; 35J/06; 35J/07; 35J/08; 35J/09; 35J/10; 35J/11; 35J/12; 35K/01; 35K/02; 35K/03; 35K/04; 35K/05; 35K/06; 35K/07; 35K/08; 35K/09; 35K/10; 35K/11; 35K/12; 25E/01; 25E/02; 25E/03; 25E/04; 25E/05; 25E/06; 25E/12; 25E/13; 25F/04
Lat/Long WENS -78.0000 -69.5000 62.7500 61.0000
Subjectseconomic geology; geochronology; igneous and metamorphic petrology; structural geology; industrial minerals; metallic minerals; asbestos; base metals; nickel; copper; diabase dykes; greenschist facies; metamorphic facies; gneisses; migmatites; amphibolite facies; hornblende diorites; gabbros; sulphides; pyroxenites; ultrabasic rocks; metavolcanic rocks; granulite facies; mafic intrusive rocks; intrusive rocks; granulites; Churchill Province; Superior Province; Larch Plateau; Hudsonian Orogeny; Kenoran Orogeny; Precambrian
Illustrationsphotographs
Released1983 01 01; 2016 02 02
AbstractThe area comprises 50 000 km 2 of the northern mainland Precambrian Shield of Quebec. The land surface, which was completely covered by ice during the Pleistocene, is variously plateau and ridge and valley type. Parts of two structural provinces are present, the Superior underlying most of the southern part of the area, and the Churchill comprising the remainder. Most of the boundary between the two is clearly defined by an unconformity between Archean and Aphebian rocks. The Superior Province consists of minor metasedimentary and metavolcanic rocks within a terrane dominated by granitic gneisses, migmatite and silicic intrusive rocks of Archean age. Late Archean diabase dykes are abundant in the eastern part. The Churchill Province contains well preserved sedimentary and volcanic rocks, the latter forming about 80 per cent, almost entirely of mafic elements. Intrusions of gabbro , pyroxenite and ultrabasic rocks are numerous within these layered rocks and together they comprise the Cape Smith Fold Belt. Farther north this province consists of granitic gneisses, paragneiss, hornblende-plagioclase gneiss, granulite and granitic intrusive rocks. A few Hadrynian diabase dykes cut the older rocks. Metamorphism in the Cape Smith Fold Belt is in the greenschist facies, which has also overprinted earlier amphibolite facies metamorphism in the Archean rocks to the south. Rocks immediately north of the fold belt are in the amphibolite facies and farther north are in the granulite facies, which in part has been overprinted by the amphibolite facies metamorphism. Structures in the Superior Province trend northward in general, whereas those in the Churchill Province are chiefly east-northeasterly. A second, younger fold direction in the Cape Smith Fold Belt trends northwest and a third trends northward. Both refold the major east-northeast folds. Steeply dipping strike faults are prominent within the fold belt. Asbestos is mined at Asbestos Hill and several nickelcopper deposits have been located in and associated with the ultrabasic intrusive rocks of the Cape Smith Fold Belt. The geology of the region indicates excellent potential for further metallic mineral discoveries.
GEOSCAN ID109241

 
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