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Geochemical, isotopic, and geochronlologic constraints on the formation of the Eagle Point basement-hosted uranium deposit, Athabasca Basin, Saskatchewan, Canada and recent remobilization of primary uraninite in secondary structures

Citation

Cloutier, J and Kyser, K and Olivo, GR and Brisbin, D, Geochemical, isotopic, and geochronlologic constraints on the formation of the Eagle Point basement-hosted uranium deposit, Athabasca Basin, Saskatchewan, Canada and recent remobilization of primary uraninite in secondary structures, Mineralium Deposita, 46, (1) pp. 35-56. ISSN 0026-4598 (2011) [Refereed Article]


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Copyright Statement

Copyright 2010 Springer-Verlag

DOI: doi:10.1007/s00126-010-0308-5

Abstract

The Athabasca Basin hosts many world-class unconformity-related uranium deposits. Recently, uranium reserves for the Eagle Point basement-hosted deposit have increased with the discovery of new mineralized zones within secondary structures. A paragenetic study of Eagle Point reveals the presence of three temporally distinct alteration stages: a pre-Athabasca alteration, a main alteration and mineralization comprised of three substages, and a post-main alteration and mineralization stage that culminated in remobilization of uraninite from primary to secondary structures. The pre-Athabasca alteration stage consists of minor amounts of clinochlore, followed by dolomite and calcite alteration in the hanging wall of major fault zones and kaolinitization of plagioclase and K-feldspar caused by surface weathering. The main alteration and uranium mineralization stage is related to three temporally distinct substages, all of which were produced by isotopically similar fluids. A major early alteration substage characterized by muscovite alteration and by precipitation Ca-Sr-LREE-rich aluminum phosphate-sulfate minerals, both from basinal fluids at temperatures around 240C prior to 1,600 Ma. The mineralization substage involved uraninite and hematite precipitated in primary structures. The late alteration substage consists of dravite, uranophane-beta veins, calcite veins, and sudoite alteration from Mg-Ca-rich chemically modified basinal fluids with temperatures around 180C. The post-main alteration and mineralization stage is characterized by remobilization of main stage uraninite from primary to secondary structures at a minimum age of ca. 535 Ma. U-Pb resetting events recorded on primary and remobilized uraninites are coincident with fluid flow induced by distal orogenies, remobilizing radiogenic Pb to a distance of at least 225 m above the mineralized zones.

Item Details

Item Type:Refereed Article
Keywords:basement-hosted, Eagle Point, geochemistry, geochronology, secondary uraninite, unconformity-related uranium deposit, fault zone, geochemistry, geochronology, mineral alteration, mineral deposit, mineralization, uraninite, uranium, Athabasca Basin
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration Geochemistry
Objective Division:Energy
Objective Group:Energy Exploration
Objective Field:Uranium Exploration
UTAS Author:Cloutier, J (Mr Jonathan Cloutier)
ID Code:133527
Year Published:2011
Web of Science® Times Cited:21
Deposited By:CODES ARC
Deposited On:2019-06-30
Last Modified:2019-08-30
Downloads:1 View Download Statistics

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