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TitleGeochemistry and geochronology of the Kiggavik uranium deposit, Nunavut, Canada
AuthorShabaga, B M; Fayek, M; Quirt, D; Jefferson, C W; Ledru, P
SourceMineralium Deposita 2020 p. 1-18,
Alt SeriesNatural Resources Canada, Contribution Series 20180041
PublisherSpringer Science and Business Media Deutschland GmbH
Mediapaper; on-line; digital
File formatpdf; html
NTS66A/03; 66A/04; 66A/05; 66A/06; 66A/07; 66A/10; 66A/11; 66A/12; 66B/01; 66B/02; 66B/07; 66B/08; 66B/09
AreaJudge Sissons Lake; Siamese Lake; Square Lake; Schultz Lake; Andrew Lake; Unconformity Lake
Lat/Long WENS -99.0000 -96.7500 64.8333 64.1667
Subjectseconomic geology; geochronology; geochemistry; mineral deposits; uranium; unconformity-type deposit; ore mineral genesis; lineaments; geophysical surveys; magnetic surveys; aeromagnetic surveys; demagnetization; remote sensing; LANDSAT; satellite imagery; photogrammetric techniques; airphoto interpretation; geological history; tectonic history; basin evolution; faulting; displacement; metamorphism; magmatism; deformation; structural analyses; structural features; faults; fractures; shear zones; foliation; imbrication; hydrothermal systems; fluid flow; shear stress; stress analyses; stress orientation; shear fractures; models; bedding planes; dykes; trend surface analyses; unconformities; discontinuities; iron formations; Archean; Kiggavik uranium camp; Thelon Basin; Thelon Fault Zone; Judge Sissons Fault Zone; Schultz Lake Intrusive Complex (SLIC); Andrew Lake Fault; Pukiq Lake Formation; Snow Island Suite; Ketyet River Group; Pipedream Assemblage; Woodburn Lake Group; Granite Thrust; Barrensland Group; Thelon Formation; Kivalliq Igneous Suite; McRae Lake Diabase; Thelon River Diabase; Nueltin Granite; Wharton Ggroup; Amarook Formation; Pitz Formation; Hudson Suite; Hudson Granite Suite; Martell Syenite; Judge Sissons Pluton; Marjorie Hills Assemblage; Amaruulik Assembalge; Half Way Hills Assemblavge; Mackenzie Igneous Event; Mackenzie Dyke Swarm; Ridge Fault; Pump Lake Fault; Skinny Lake Gorst; Long Lake Horst; Phanerozoic; Paleozoic; Ordovician; Precambrian; Proterozoic
Illustrationslocation maps; stratigraphic cross-sections; tables; graphs; diagrams
ProgramGEM2: Geo-mapping for Energy and Minerals South Rae Province Bedrock/Surficial geology
Released2020 09 16
AbstractThe Thelon Basin, Nunavut, Canada, is similar in age, size, and geology to the U producing Athabasca Basin in Saskatchewan. The Kiggavik project area, located immediately south of the Aberdeen sub-basin of the Thelon Basin, contains U deposits and showings along a ~30-km-long NE-SW structural trend. The basement-hosted Kiggavik deposit, comprising three separate mineralized zones (Main, Centre, and East), is located at the northern end of this trend. Multiple styles of U mineralization and alteration were identified at the Kiggavik deposit. Disseminated euhedral uraninite (U1; 1284±53 Ma) has elevated Pb contents up to ~14 wt% PbO and is associated with illite and hematite alteration. Vein-style uraninite (U2; 284±19 Ma) forms along fractures, contains lower Pb contents (=3.9 wt% PbO), and is partly altered to Ca-Si-rich (~4.5 wt% CaO and ~3.3 wt% SiO2) uraninite. Highly altered U2 is associated with galena. Late U minerals (U3) have biogenic textures and are Pb-free, indicating that they formed recently (<1 Ma). Based on SIMS in situ U-Pb geochronology, the minimum age of uraninite at the Kiggavik deposit is 1284±53 Ma; however, this is likely a reset age associated with the Mackenzie dyke event (~1267 Ma). Oxygen and hydrogen stable isotope compositions of illite and muscovite suggest that the Kiggavik deposit has been overprinted by high-latitude surficial fluids derived from snowmelt.

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