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TitreFar north geomapping initiative: bedrock geology of the Snyder Lake area, northwestern Manitoba (part of NTS 64N5)
AuteurKremer, P D; Böhm, C O; Rayner, N
SourceManitoba Industry, Trade & Mines, Manitoba Geological Survey, Report of Activities 2011, 2011 p. 6-17
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110235
ÉditeurManitoba Innovation, Energy and Mines, Manitoba Geological Survey
Lang.anglais
Mediapapier
Formatspdf
ProvinceManitoba
SNRC64N/05SW
Lat/Long OENS-102.0000 -101.0000 59.5000 59.0000
Sujetsgéologie du substratum rocheux; roches sédimentaires métamorphosées; gneiss; marbres; Archéen; métamorphisme; minéralisation; gisements d'uranium; Supergroupe de Wollaston ; stratigraphie; géologie structurale; géochronologie; Précambrien
Illustrationslocation maps; photographs
ProgrammeGEM : La géocartographie de l'énergie et des minéraux
LiensOnline - En ligne
Résumé(disponible en anglais seulement)
The 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.
GEOSCAN ID289396