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TitleRegional geology and mineral potential of the Winter Lake-Lac de Gras area, central Slave Province, Northwest Territories
DownloadDownload (whole publication)
AuthorThompson, P H; Russell, I; Paul, D; Kerswill, J A; Froese, E
SourceCanadian Shield/Bouclier canadien; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1995-C, 1995 p. 107-119, (Open Access)
PublisherNatural Resources Canada
Lang.English; French
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (1995). Canadian Shield, Geological Survey of Canada, Current Research no. 1995-C
File formatpdf
ProvinceNorthwest Territories
NTS76D/03; 76D/04; 76D/05; 76D/06; 76D/11; 76D/12; 76D/13; 76D/14; 86A/01; 86A/02; 86A/07; 86A/08; 86A/09; 86A/10; 86A/15; 86A/16
AreaWinter Lake; Lac de Gras; Desteffany Lake; Courageous Lake
Lat/Long WENS-113.0000 -111.0000 65.0000 64.0000
Subjectsigneous and metamorphic petrology; structural geology; metallic minerals; structural interpretations; faults; folds; mineral potential; structural features; geothermal gradient; Archean; hydrothermal alteration; alteration; metamorphism; metallogeny; metamorphism, regional; lithology; igneous rocks; volcanic rocks; granitic rocks; plutonic rocks; Slave Province; Yellowknife Supergroup; Precambrian
Illustrationsphase diagrams
ProgramCanada-Northwest Territories Mineral Initiatives, 1991-1996
ProgramSlave Province NATMAP Project
Released1995 01 01
AbstractCompletion of regional mapping further emphasizes division of the area into one domain of metamorphosed sedimentary rocks and a second dominated by recrystallized, migmatitic, and gneissic granitoids. Discordant metamorphosed dykes, discordant isograds, and the change from curvilinear fold interference patterns to blocky, subrhombic structures indicate the metagranitoid complexes are older than Yellowknife Supergroup surpracrustal rocks. Interpreted as a relict of extensional structures related to basin formation, the subrhombic distribution of supracrustal rocks within and around large blocks of metagranitoid had a strong influence on later compressional structures. Geothermal gradients associated with regional low pressure metamorphism are high enough to have generated syntectonic magmatism from moderately overthickened sialic crust and to preclude an Archean age for diamonds. Metamorphosed hydrothermal alteration zones found near base metal occurrences in the Courageous Lake volcanic belt also occur in less well explored and in newly discovered supracrustal sequences. Sulphide banded iron-formation, not previously recognized, provides additional economic interest.