Radiogenic lead mobility in the Shea Creek unconformity-related uranium deposit (Saskatchewan, Canada): migration pathways and Pb loss quantification

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• 作者：Kister ; Philippe ; Cuney ; Michel ; Golubev ; Viacheslav N. ; Royer ; Jean-Jacques ; Le Carlier De Veslud ; Christian ; et. al.
• 关键词：lead mobility ; isotopic age ; radiogenic lead ; natural analogue ; uranium ; mobilité ; du plomb ; â ; ge isotopique ; plomb radiogé ; nique ; analogue naturel ; uranium
• 刊名：Comptes Rendus Geoscience
• 出版年：2004
• 出版时间：March, 2004
• 年：2004
• 卷：336
• 期：3
• 页码：205-215
• 全文大小：370 K

文摘

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 Uder=0 SRC=/images/glyphs/BO7.GIF>Pb 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).