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TitleMineralogy and K-Ar geochronology of clay alteration associated with uranium mineralization in the Patterson Lake Corridor, Saskatchewan
AuthorPowell, J WORCID logo; Percival, J BORCID logo; Potter, E GORCID logo; van der Lelij, R; Xie, R
SourceGeochemistry: Exploration, Environment, Analysis vol. 22, geochem2021-061, 2022 p. 1-16,
Alt SeriesNatural Resources Canada, Contribution Series 20210228
PublisherGeological Society of London / Association of Applied Geochemists
Mediapaper; digital; on-line
File formatpdf; html
NTS74A; 74B; 74C; 74D; 74E; 74F; 74G; 74H; 74I; 74J; 74K; 74L; 74M; 74N; 74O; 74P
AreaPatterson Lake
Lat/Long WENS-112.0000 -104.0000 60.0000 56.0000
Subjectsgeochronology; Science and Technology; Nature and Environment; uranium; Athabasca Basin
Illustrationslocation maps; photographs; tables; diagrams; charts
ProgramTargeted Geoscience Initiative (TGI-5) Uranium ore systems - fluid pathways
Released2022 09 02
AbstractThe Patterson Lake corridor (PLC) along the southwestern margin of the Proterozoic Athabasca Basin contains high-grade uranium deposits entirely within crystalline basement rocks. Visible-near infrared - shortwave infrared (VNIR-SWIR) spectroscopy measurements on drill core samples from the Triple R and Arrow deposits exhibit downhole spectral trends related to the crystallinity and thermal maturity of clays (illite and kaolinite) and mineralization. The K-Ar dates of silt-and-clay size fractions (10-6 micrometres; 6-2 micrometres; 2-0.6 micrometres; 0.6-0.2 micrometres; <0.2 micrometres) from five clay-altered samples decrease with grain size, and span 1608 ± 17 Ma to 1060 ± 14 Ma for the Spitfire discovery (n = 14) and 1342 ± 17 Ma to 289 ± 4.3 Ma for the Arrow deposit (n = 4). Alteration assemblages are broadly similar to basement-hosted deposits in the Athabasca Basin, and K-Ar dates suggest that high-grade uranium mineralization in the PLC may be, in part, due to hydrothermal remobilization and concentration of the primary ores. Integration of geochronology, clay mineralogy and VNIR-SWIR spectral parameters identify fertile fluid conduits when expanded to property- or corridor-scales, and provide additional evidence that the ore grades of the Athabasca Basin deposits reflect several stages of hydrothermal mineralization spanning ~1000 Ma.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) 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. This contribution defines the type and age of clay mineral alteration associated with the recently discovered Patterson Lake Corridor uranium deposits located on the southwestern margin of the Athabasca Basin. The results identify the key clay mineral types associated with hydrothermal alteration and uranium mineralization, whereas the age dating provide the first robust time constraints on the ore systems in the region. The age dates support the hypothesis that several hydrothermal events in the district were responsible for the exceptionally high ore grades.

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