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TitreMineralogy, geochronology, and genesis of the Andrew Lake uranium deposit, Thelon Basin, Nunavut, Canada
AuteurShabaga, B M; Fayek, M; Quirt, D; Jefferson, C W; Camacho, A
SourceCanadian Journal of Earth Sciences vol. 54, no. 8, 2017., https://doi.org/10.1139/cjes-2017-0024
Année2017
Séries alt.Secteur des sciences de la Terre, Contribution externe 20170300
ÉditeurNRC Research Press
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1139/cjes-2017-0024
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNunavut
SNRC66C; 66D
Lat/Long OENS-100.0000 -98.0000 66.0000 64.0000
Sujetsgisements d'uranium; minéralisation; quartz; modèles; uraninite; illite; hématite; oxydes de fer; coffinite; boltwoodite; datations au uranium-plomb; datation au uranium-plomb; fluides de formation; Bassin de Thelon ; minéraux radioactifs
Illustrationslocation maps; geological sketch maps; tables; lithologic sections; photographs; Concordia diagrams
ProgrammeGéologie du substratum rocheux et des dépôts meubles du sud de la province de Rae, GEM2 : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
The Thelon Basin located in Nunavut, Canada, shares many similarities with the U-producing Athabasca Basin in Saskatchewan. The Kiggavik project area, located near the northeastern edge of the Thelon Basin, contains U deposits and showings along the -30 km long NE-W Kiggavik - Andrew Lake structural trend. The Andrew Lake deposit is near the southern end of this trend. Pre-mineralization is characterized by quartz ± carbonate veins that occupy fault systems later reactivated as conduits for U-mineralizing fluids. A four-phase genetic model is proposed for the Andrew Lake deposit. Phase 1 comprises vein-style uraninite (U1; 1031 ± 23 Ma) that is associated with illite and hematite, and contains variable PbO contents (0.2-9.5 wt.%). Phase 2 is characterized by altered uraninite (U2; -530 Ma) that is associated with coffinite. Altered uraninite (U3; <1 Ma) characterizes phase 3 and occurs as centimetre-scale "roll-fronts". In phase 4, all three uraninite stages, and coffinite, are altered to boltwoodite. Although the oldest uraninite U-Pb age is -1030 Ma, illite associated with the U mineralization gives 40Ar/39Ar ages of 941 ± 31 and 1330 ± 36 Ma. The younger age is similar to the age for U1, suggesting that there was a fluid event that either precipitated U1 or reset the U-Pb isotopic system at -1000 Ma. While the older age for illite (1330 Ma) does not correlate with Andrew Lake U-Pb uraninite ages, it does correlate with ages previously reported for uraninite and clay alteration minerals in the Kiggavik area.
GEOSCAN ID306335