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TitleIntegrated regional analysis of the Red Lake greenstone belt and its mineral deposits, western Superior Province, Ontario
AuthorSanborn-Barrie, M; Skulski, T; Parker, J; Dubé, B
SourceGeological Survey of Canada, Current Research (Online) no. 2000-C18, 2000, 16 pages,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (2000). Current Research 2000, Geological Survey of Canada, Current Research (Online) no. 2000-ABCDE
File formatpdf
NTS52M/01; 52N/04
AreaRed Lake
Lat/Long WENS-94.5000 -93.5000 51.2500 51.0000
Subjectsstructural geology; igneous and metamorphic petrology; Archean; lithology; igneous rocks; volcanic rocks; basalts; rhyolites; dacites; andesites; metasedimentary rocks; komatiites; conglomerates; field relations; bedrock geology; plutonic rocks; granitic rocks; structural features; folds; hydrothermal alteration; deformation; structural trends; foliation; shear zones; mineralization; gold; unconformities; tectonic setting; Superior Province; Red Lake greenstone belt; Balmer assemblage; Ball assemblage; Bruce Channel assemblage; Confederation assemblage; Madsen mine; Precambrian
Illustrationssketch maps; photographs
ProgramWestern Superior NATMAP Project
Released2000 01 01
AbstractThe Red Lake greenstone belt records a 300 Ma history of episodic volcanism, sedimentation, deformation, and mineralization. The Balmer assemblage, host to current and past-producing gold mines, consists of tholeiitic and komatiitic lava flows intercalated with 2.98-2.96 Ga felsic volcanic, clastic, and chemical sedimentary rocks. The Ball assemblage comprises crustally contaminated komatiite, tholeiitic basalt, 2.94-2.92 Ga calc-alkaline, felsic volcanic rocks, and stromatolitic carbonate. The Slate Bay sedimentary assemblage of wacke, conglomerate and less than 2.91 Ga quartzose arenite records accumulated Balmer- and Ball-age material, prior to the 2.89 Ga intermediate pyroclastic volcanism and sedimentation of the Bruce Channel assemblage. The Confederation assemblage rests unconformably on the Balmer, and consists of basal conglomerate, 2.74 Ga FIII-type rhyolite and tholeiitic basalt with volcanogenic- massive-sulphide-style alteration-mineralization, and younger 2.73 Ga calc-alkaline pyroclastic rocks. Polyphase deformation involved pre-Confederation tilting and at least two episodes of post-Confederation deformation reflected by folds and fabrics of low to moderate finite strain.