Formation of the enigmatic Matoush uranium deposit in the Paleoprotozoic Otish Basin, Quebec, Canada

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• 作者：Paul Alexandre ; Kurt Kyser ; Daniel Layton-Matthews ; Steve R. Beyer…
• 刊名：Mineralium Deposita
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：50
• 期：7
• 页码：825-845
• 全文大小：4,205 KB
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• 作者单位：Paul Alexandre (1)
  Kurt Kyser (1)
  Daniel Layton-Matthews (1)
  Steve R. Beyer (1)
  Eric E. Hiatt (2)
  Jonathan Lafontaine (3)
  
  1. Department of Geological Sciences, Queen’s University, Kingston, ON, K7L 3N6, Canada
  2. Department of Geology, University of Wisconsin-Oshkosh, Oshkosh, WI, 54901, USA
  3. Strateco Resources Inc., 1225 Gay-Lussac Street, Boucherville, QC, J4B 7K1, Canada
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1866

文摘

The Matoush uranium deposit is situated in the Paleoproterozoic Otish Basin, northern Quebec, Canada, and is hosted by the Indicator Formation sandstones. Its sheet-like ore bodies are closely associated with the steeply dipping Matoush Fracture, which hosts mafic dykes and minor quartz–feldspar–tourmaline pegmatites. Regional diagenesis, involving oxidizing basinal fluids (δ2H ～?15- δ18O ?-, produced mostly illite and possibly leached U from accessory phases in the Indicator Formation sandstones. The bimodal Matoush dyke intruded the Indicator Formation along the Matoush Fracture, and the related metasomatism produced Cr-rich dravite and muscovite in both the dyke and the proximal sandstones. Uraninite formed when U6+ in the basinal brine was reduced to U4+ in contact with the mafic dyke and by Fe2+ in Cr–dravite and Cr–muscovite, and precipitated together with eskolaite and hematite. Because of its unique characteristics, the Matoush deposit cannot be easily classified within the generally accepted classification of uranium deposits. Two of its main characteristics (unusual reduction mechanism, structural control) do not correspond to the sandstone-hosted group of deposits (unconformity type, tabular, roll front), in spite of uranium being derived from the Otish Group sandstones. Editorial handling: B. Lehmann