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• Main Authors: G. R. Parslow, D. J. Thomas
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: deposits (-1100 Ma; 0.2 % U3Os). These; Uranium City; Cree Lake; Lake Athabasca
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.599.4427; http://www.minersoc.org/pages/Archive-MM/Volume_46/46-339-163.pdf

ABSTRACT. Over 100 samples of 'pegmatite ' and associ-ated host rocks from the Cree Lake Zone of northern Saskatchewan have been studied. The degree of U and Th enrichment of the pegmatites appears to depend on the parent material of the anatectic melts produced during the Hudsonian thermotectonic event. Evidence for Archaean granulite-facies depletion of U and Th is inconclusive; however, important enrichment of U and Th in the basal Aphebian is associated with metamor-phosed black shales and possibly evaporates. NORTHERN Saskatchewan is well known as a uranium-producing area. Two groups of economic deposit are recognized--the 'vein type ' of the Beaverlodge Area around Uranium City (north of Lake Athabasca in north-western Saskatchewan) and the 'unconformity type ' associated with the basal of the Athabasca Formation (fig. 1). The former are at least in part older (-,- 1750 Ma) and of lower grade (< 0.2 % UaOs) than the latter