Fossil sulphate-reducing bacteria in the Bleiberg lead-zinc deposit, Austria

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• 作者：Henryk Kucha ; Erich Schroll and Eugen F. Stumpfl
• 关键词：Zinc ; Lead ; Sphalerite ; Sulphur isotopes ; Peloids ; Bacteria ; Bleiberg
• 刊名：Mineralium Deposita
• 出版年：2005
• 出版时间：July 2005
• 年：2005
• 卷：40
• 期：1
• 页码：123-126
• 全文大小：429 KB

文摘

Polished ore samples from the world-class Bleiberg lead-zinc deposit in Austria were studied by Field Emission Scanning Electron Microscopy (FESEM) at magnifications in the range of 105–106. The zinc ore shows nano-sized sphalerite filaments and spherules which are morphologically similar to recent biofilms of sulphate-reducing bacteria. The activity of sulphate-reducing bacteria is suggested by a large 34S difference of ~40 between coeval seawater sulphate (+16 ) and sulphide sulphur () in the Bleiberg ores, and by variable sulphur valences. Peloids of sphalerite, Zn-bearing calcite and pyrite have features typical of bacterial colonies. Combined with geological and mineralogical evidence, a significant role of bacteria during ore deposition at Bleiberg is likely.