Extreme 34S depletions in ZnS at the Mike gold deposit, Carlin Trend, Nevada: Evidence for bacteriogenic supergene sphalerite

Bawden, T. M.; Einaudi, M. T.; Bostick, B. C.; Meibom, A.; Wooden, J.; Norby, J. W.; Orobona, M. J. T.; Chamberlain, C. P.

Abstract:

We identified submicrometer-sized framboidal sphalerite (ZnS) below the base of supergene oxidation in a Carlin-type gold deposit of Eocene age in Nevada, United States, where the framboidal sphalerite forms a blanket-like body containing >400,000 metric tons of zinc. Framboidal sphalerite <0.1 ??m in diameter, formed in the early Miocene, ranges from <0.1 to 0.35 mol% FeS; the ??34S values range from -25??? to -70???, the lowest values measured in a marine or terrestrial environment. These S isotope data demonstrate the involvement of sulfate-reducing bacteria and provide the first documentation that sphalerite can form significant supergene sulfide-enrichment blankets.

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Article

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70025582

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Bawden, T. M.; Einaudi, M. T.; Bostick, B. C.; Meibom, A.; Wooden, J.; Norby, J. W.; Orobona, M. J. T.; Chamberlain, C. P.

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916

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English

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Geology

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Extreme 34S depletions in ZnS at the Mike gold deposit, Carlin Trend, Nevada: Evidence for bacteriogenic supergene sphalerite; 2003; Article; Journal; Geology; Bawden, T. M.; Einaudi, M. T.; Bostick, B. C.; Meibom, A.; Wooden, J.; Norby, J. W.; Orobona, M. J. T.; Chamberlain, C. P.