Belogub, E. V., Novoselov, C. A., Spiro, B., Yakovleva, B. A. (2003) Mineralogical and S isotopic features of the supergene profile of the Zapadno-Ozernoe massive sulphide and Au-bearing gossan deposit, South Urals. Mineralogical Magazine, 67 (2) 339-354 doi:10.1180/0026461036720105
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Mineralogical and S isotopic features of the supergene profile of the Zapadno-Ozernoe massive sulphide and Au-bearing gossan deposit, South Urals | ||
| Journal | Mineralogical Magazine | ||
| Authors | Belogub, E. V. | Author | |
| Novoselov, C. A. | Author | ||
| Spiro, B. | Author | ||
| Yakovleva, B. A. | Author | ||
| Year | 2003 (April) | Volume | 67 |
| Issue | 2 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/0026461036720105Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243432 | Long-form Identifier | mindat:1:5:243432:6 |
| GUID | 0 | ||
| Full Reference | Belogub, E. V., Novoselov, C. A., Spiro, B., Yakovleva, B. A. (2003) Mineralogical and S isotopic features of the supergene profile of the Zapadno-Ozernoe massive sulphide and Au-bearing gossan deposit, South Urals. Mineralogical Magazine, 67 (2) 339-354 doi:10.1180/0026461036720105 | ||
| Plain Text | Belogub, E. V., Novoselov, C. A., Spiro, B., Yakovleva, B. A. (2003) Mineralogical and S isotopic features of the supergene profile of the Zapadno-Ozernoe massive sulphide and Au-bearing gossan deposit, South Urals. Mineralogical Magazine, 67 (2) 339-354 doi:10.1180/0026461036720105 | ||
| Abstract/Notes | The profile of the supergene zone of the Zapadno-Ozernoe massive sulphide Cu-Zn deposit differs from the classic model (Emmons, 1917) in that it includes a prominent dark sooty subzone rich in secondary sulphides. This subzone is situated above residual pyrite sands, which overlie the massive sulphide body and below quartz-baryte leached sands. It contains a diverse mineral assemblage which consists of secondary sulphides such as galena, sphalerite, metacinnabar, Se-bearing pyrite—dhzarkenite series, tiemannite, native Au, native S and native Se, and unidentified sulphosalts of Ag and Hg. The very light S isotope composition of the secondary sulphides (lowest values δ34S = —17.2‰ (VCDt) in comparison with primary pyrite ∼0‰ and baryte +18.4‰ is indicative of bacterial sulphate reduction. The overlying oxidized part of the supergene column contains minerals of the jarosite-beudantite- segnitite series. The maximum concentrations of Au, up to 150 ppm, occur in the lower part of the profile. The atypical structure, mineral assemblage and S isotope composition of the secondary sulphides in the dark layer of the supergene profile are indicative of particular geochemical conditions due to the existence of a stagnant water body that gave rise to intense bacterial activity, in turn controlled by fluctuations in the redox boundary. | ||
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