Gold and palladium minerals (including empirical PdCuBiSe3) from the former Roter B?r mine, St. Andreasberg, Harz Mountains, Germany: a result of low-temperature, oxidising fluid overprint

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• 作者：Alexandre Raphael Cabral ; Wilfried Lie?mann ; Bernd Lehmann
• 刊名：Mineralogy and Petrology
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：109
• 期：5
• 页码：649-657
• 全文大小：1,313 KB
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• 作者单位：Alexandre Raphael Cabral (1)
  Wilfried Lie?mann (2)
  Bernd Lehmann (1)
  
  1. Mineral Deposits, Technische Universit?t Clausthal, Adolph-Roemer-Str. 2A, 38678, Clausthal-Zellerfeld, Germany
  2. Lehrbergwerk Grube Roter B?r Sankt Andreasberg, Rosdorfer Weg 33a, D-37073, G?ttingen, Germany
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Mineralogy
  Geochemistry
  
• 出版者：Springer Wien
• ISSN：1438-1168

文摘

At Roter B?r, a former underground mine in the polymetallic deposits of St. Andreasberg in the middle-Harz vein district, Germany, native gold and palladium minerals occur very locally in clausthalite–hematite pockets of few millimetres across in carbonate veinlets. The native gold is a Au–Ag intermetallic compound and the palladium minerals are characterised as mertieite-II [Pd₈(Sb,As)₃] and empirical PdCuBiSe₃ with some S. The latter coexists with bohdanowiczite (AgBiSe₂), a mineral that is stable below 120 °C. The geological setting of Roter B?r, underneath a post-Variscan unconformity, and its hematite–selenide–gold association suggest that oxidising hydrothermal brines of low temperature were instrumental to the Au–Pd mineralisation. The Roter B?r Au–Pd mineralisation can be explained by Permo-Triassic, red-bed-derived brines in the context of post-Variscan, unconformity-related fluid overprint. Editorial handling: F. Gervilla