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TitleAlteration within the basement rocks associated with the P2 fault and the McArthur River uranium deposit, Athabasca Basin
AuthorAdlakha, E E; Hattori, K; Zaluski, G; Kotzer, T; Potter, E G
SourceGeological Survey of Canada, Open File 7462, 2014, 35 pages, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
File formatpdf
NTS74H/15; 64L
AreaMcArthur River; Wollaston Lake
Lat/Long WENS-105.0000 -104.5000 58.0000 57.7500
Lat/Long WENS-104.0000 -102.0000 59.0000 58.0000
Subjectseconomic geology; mineral exploration; exploration; uranium; uranium deposits; mineralization; unconformity-type deposit; unconformities; alteration; metamorphic rocks; gneisses; basins; sedimentary basins; structural features; faults; shear zones; basement geology; bedrock geology; Archean; metamorphism; Athabasca Basin; Athabasca Group; Rae Province; Hearne Province; P2 fault zone; Precambrian; Proterozoic
Illustrationslocation maps; tables; plots; photomicrographs; ternary diagrams
ProgramTargeted Geoscience Initiative (TGI-4), Uranium Ore Systems
Released2014 01 23
AbstractThe P2 reverse fault in the Athabasca Basin was a conduit for basinal fluids to enter the basement rocks below the regional unconformity and modify the rocks through fluid-rock interactions. Along the P2 fault, the basement rocks consist predominately of graphitic metapelite with quartzite and pegmatite. Immediately below the unconformity is an alteration profile consisting of a lower Green Zone with chlorite and illite, middle Red Zone dominated by hematite and kaolinite, and a discontinuous Bleached Zone of kaolin-group minerals and illite right at the unconformity. Preliminary data suggest that the alteration profile cannot be attributed solely to paleo-weathering but rather must include multiple fluid events from paleo-weathering through diagenetic to late hydrothermal fluids.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. Currently, all of Canada's uranium production comes from the Athabasca Basin. The McArthur River and nearby Millennium deposits within the basin are spatially associated with a regional fault system termed the P2 structure. At McArthur River, high-grade mineralization is bound by the regional P2 and the local VQ fault systems. The spatial relationship implies that the structures played a role in focusing ore-forming fluids during creation of the deposit. This study aims to build on that hypothesis by documenting subtle mineralogical, geochemical and isotopic changes in the fault systems as they approach the deposit.