Fossil sulphate-reducing bacteria in the Bleiberg lead-zinc deposit, Austria |
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| Authors: | Henryk Kucha Erich Schroll Eugen F Stumpfl |
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| Institution: | (1) University of Mining and Metallurgy, Mickiewicza 30, 30-059 Krakow, Poland;(2) Institute of Mineralogy and Crystallography, University of Vienna, 1090 Wien, Althanstrasse 14, Austria;(3) Institute of Geological Sciences, Mining University Leoben, Peter Tunner Str. 5, 8700 Leoben, Austria |
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| Abstract: | 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 (< –25 ) 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.Eugen F. Stumpfl deceasedEditorial handling: B. Lehmann |
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| Keywords: | Zinc Lead Sphalerite Sulphur isotopes Peloids Bacteria Bleiberg |
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