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Sulphur isotope distribution in the Pb-Zn-deposit Bleiberg (Carinthia,Austria) |
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| Authors: | E. Schroll O. Schulz E. Pak |
| Affiliation: | 1. Geotechnisches Institut der Bundesversuchs- und Forschungsanstalt Arsenal, Wien 2. Institut für Mineralogie und Petrographie, Universit?t Innsbruck, Austria 3. Institut für Radiumforschung und Kernphysik der ?sterreichischen Akademie der Wissenschaften, Wien, Austria |
| Abstract: | The sulphur isotope composition of 233 sulphides and 40 sulphates has been investigated and evaluated in combination with 29 earlier published data. The total variation of δ34S values for the sulphides and the sulphates ranges from ?40 up to ?1 ‰ and from +7 up to +20 ‰, respectively. For the mineral species the variations are (with number of samples in brackets): galena (96) ?32 up to ?2 ‰, sphalerite (141) ?30 up to ?4 ‰, marcasite (16) ?27 up to ?1 ‰, pyrite (10) ?26 up to ?13 ‰, molybedenite (3) ?40 up to ?29 ‰, anhydrite and gypsum (8) +15 up to +20 ‰, coelestine (1) +19 ‰, and barite (33) +7 up to +18 ‰. The frequency distribution of the δ34S values corresponds with the complexity of the ore forming processes which resulted in six strata-bound ore mineralizations. The sulphate values clearly show that the sulphate sulphur originates from sea water sulphate. The sulphides are formed by bacteriogeneric processes from seawater sulphate, and their sulphur isotope composition depends on the lithofacies of the sediments as well as on the following diagenetic processes. |
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