GEOSCAN Search Results: Fastlink


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: Geo-mapping for Energy and Minerals, GEM Tri-Territorial Information management & Databases (Remote Predictive Mapping / Mineral Resource Assessment)
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.