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TitleUranium-enriched bedrock in the central Wopmay orogen: implications for uranium mineralization
AuthorOotes, L; Harris, J; Jackson, V A; Azar, B; Corriveau, L
SourceExploration and Mining Geology vol. 21, 2013 p. 85-103
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20110376
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories
NTS86C/01; 86C/02; 86C/03; 86C/05; 86C/06; 86C/07; 86C/08
AreaFaher Lake
Lat/Long WENS-118.0000 -116.0000 64.5000 64.0000
Subjectseconomic geology; geochemistry; uranium; uranium deposits; mineral deposits; mineral occurrences; mineralization; iron oxides; gold; unconformity-type deposit; lithogeochemistry; Wopmay Orogen; Great Bear Magmatic Zone
Illustrationslocation maps; photographs; ternary diagrams; plots; photomicrographs
ProgramGEM Tri-Territorial Information management & Databases (Remote Predictive Mapping / Mineral Resource Assessment), GEM: Geo-mapping for Energy and Minerals
AbstractWe use the results of new bedrock mapping, combined with geochemical point data and airborne radiometric data (in particular equivalent uranium concentrations) to help determine which geo-logical units in the Paleoproterozoic Great Bear magmatic zone (GBmz) contain elevated uranium. The data collectively indicate that the highest primary uranium concentrations are in equigranular granites and subvolcanic/volcanic porphyries. Notably, these rocks host the majority of known uranium-bearing deposits and/or prospects in the GBmz. We speculate that the uranium in these deposits/prospects was derived from nearby, uranium-enriched rocks and was mobilized by much younger, circulating hydrothermal fluids. Sedimentary rocks of the Thelon and Dismal Lakes groups unconformably overlie the GBmz and are known to host unconformity-type and sandstone-hosted uranium prospects. Most likely, the uranium-enriched rocks of the GBmz acted as a uranium donor to these overlying sedimentary basins. The method of investigation employed in this study may be applicable to other 'granitic' terrains in order to identify re-gions with favourable rocks for uranium exploration.