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TitreGeochemistry and Geochronology of the Andrew Lake Deposit in basement to the, Thelon Basin, Nunavut, Canada
AuteurShabaga, B M; Fayek, M; Quirt, D; Davis, B; Pestaj, T; Jefferson, C W
SourceGeological Association of Canada, Program and Abstracts (2015), 2015.
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150032
ÉditeurAssociation géologique du Canada
RéunionGeological Association of Canada Annual Meeting; Montreal; CA; mai 3-7, 2015
Documentlivre
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
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
ProgrammeGéologie du substratum rocheux et des dépôts meubles du sud de la province de Rae, GEM2 : La géocartographie de l'énergie et des minéraux
LiensOnline - En ligne
Résumé(disponible en anglais seulement)
The Thelon Basin is an intracratonic Paleoproterozoic basin that shares many similarities with the U producing Athabasca Basin,
Canada. However, there are striking geological differences that highlight the need to better characterize the Thelon U systems. The Kiggavik project area, located near the northeastern edge of the basin, comprises a series of deposits and showings along an ~18km long NE-SW structural trend. At present, the basement-hosted Andrew Lake deposit is the southernmost end-member along this trend, located near the intersection with the Scissons North fault. Mineralization is hosted within Neoarchean metasedimentary rocks informally termed the Woodburn Lake group. The objectives of this study are to: (a) characterize the deposit mineralogy, (b) determine the ages of U and alteration minerals, and (c) develop a genetic model for the Andrew Lake deposit for comparison to other deposits along the trend. Three generations of U minerals have been identified: (1) uraninite, (2) coffinite, and (3) boltwoodite. Stage 1 uraninite occurs as nodules, veins and fracture-filling grains interstitial to quartz, and as colloform uraninite. Stage 1 uraninite has relatively high and variable SiO2
and CaO contents, ranging from 0.63 to 7.23 wt.% and 1.94 to 8.14 wt.%, respectively. Alteration of nodular and colloform uraninite formed stage 2 coffinite, which is characterized by elevated and variable SiO2 contents ranging from 9.35 to 20.97 wt.%. Stage 3 boltwoodite occurs clusters and disseminated halos around coffinite. Apatite occurs in several units, but is not associated with U minerals. Based on major element chemistry and UPb isotopic analysis of U minerals, both U and Pb were remobilized by numerous hydrothermal fluid events. Therefore, the oldest age obtained for U minerals, 578 Ma, is clearly not primary. Further work is required to establish how these stages of U correlate with hydrothermal fluid events recorded in other deposits in the Kiggavik area.
Résumé(Résumé en langage clair et simple, non publié)
La présente étude fait partie d'une caractérisation en cours des gisements d'uranium constituant le camp minier de Kiggavik, à l'ouest du lac Baker, au Nunavut. Le gisement d'Andrew Lake est situé au sud-ouest du camp. Notre étude indique que ce gisement présente une réactivation et une remobilisation beaucoup plus tardives que les zones Main, Centre et East de la propriété Kiggavik. Il est important de comprendre l'histoire et la zonation de l'altération de ces gisements pour prospecter à la recherche d'autres ressources dans le camp de Kiggavik, ainsi que pour étendre la recherche à d'autres parties comparables du craton de Rae au Nunavut et dans les Territoires du Nord-Ouest.
GEOSCAN ID296372