Radiogenic lead mobility in the Shea Creek unconformity-related uranium deposit (Saskatchewan,Canada): migration pathways and Pb loss quantification |
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| Authors: | Philippe Kister Michel Cuney Viacheslav N Golubev Jean-Jacques Royer Christian Le Carlier De Veslud Jean-Claude Rippert |
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| Institution: | 1. CREGU-UMR G2R 7566, université Henri-Poincaré, BP 239, 54506 Vandoeuvre-lès-Nancy cedex, France;2. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny per. 35, Moscow 109017, Russia;3. CRPG–CNRS et LIAD–ENSG, BP 40, 54500 Vandoeuvre-lès-Nancy, France;4. COGEMA Resource Inc., Exploration Department, P.O. Box 9204, Saskatoon, SK S7K3X5, Canada |
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| Abstract: | The average Pb/U ratio of the Shea Creek unconformity-type uranium deposit has been estimated at 0.071±0.015. The calculation was performed on a volume enclosing the orebody to take into account the possible radiogenic lead migration within the ore zone. Despite this precaution, this ratio is significantly lower than the expected ratio (0.211) assuming a main U deposition around 1315 Ma, as suggested by previous UPb isotopic dating. Although part of the radiogenic lead can be trapped as galena within the orebody, about 60% of Pb have migrated more than 700 m away from the orebody, preferentially along the unconformity. To cite this article: P. Kister et al., C. R. Geoscience 336 (2004). |
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| Keywords: | lead mobility isotopic age radiogenic lead natural analogue uranium mobilité du plomb âge isotopique plomb radiogénique analogue naturel uranium |
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