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TitleFar north geomapping initiative: bedrock geology of the Snyder Lake area, northwestern Manitoba (part of NTS 64N5)
AuthorKremer, P D; Böhm, C O; Rayner, N
SourceManitoba Industry, Trade & Mines, Manitoba Geological Survey, Report of Activities 2011, 2011 p. 6-17
Alt SeriesEarth Sciences Sector, Contribution Series 20110235
PublisherManitoba Innovation, Energy and Mines, Manitoba Geological Survey
File formatpdf
AreaSnyder Lake
Lat/Long WENS-102.0000 -101.0000 59.5000 59.0000
Subjectsstratigraphy; structural geology; geochronology; bedrock geology; metasedimentary rocks; gneisses; marbles; Archean; metamorphism; mineralization; uranium deposits; Wollaston Supergroup; Precambrian
Illustrationslocation maps; photographs
ProgramGEM: Geo-mapping for Energy and Minerals
LinksOnline - En ligne
AbstractThe Manitoba Geological Survey's Far North Geomapping Initiative continued in the summer of 2011 with bedrock and surfi cial geological mapping in the Snyder Lake area, in the northwestern corner of the province. The Snyder Lake area is largely underlain by mediumto upper-amphibolite - grade metasedimentary rocks of the Wollaston Supergroup, including psammitic, semipelitic, pelitic, and lesser amounts of calcsilicate gneiss and marble. Southeast and northwest of Snyder Lake, the sedimentary succession is fl anked by intrusive rocks of potential Archean age that were metamorphosed at upper amphibolite- to granulite-facies conditions. Calciumrich horizons (calcsilicate gneiss and marble) within the Snyder Lake area locally host uranium and/or rare earth element enrichments of economic interest (main occurrences are Pitchblende Ridge and Snyder Island). Mineralization occurs both in outcrop and glacial deposits (e.g., boulders), with dispersal of the latter being small. Uranium and rare earth element mineralization appears to be focused on highly altered (silicifi ed, albitized, hematized) zones in calcareous horizons of the sedimentary sequence, which presents a different mineralization environment and process compared to the unconformity-type uranium deposits at or near the top of the Wollaston Supergroup rocks in Saskatchewan.