Extreme 34S depletions in ZnS at the Mike gold deposit, Carlin Trend, Nevada: Evidence for bacteriogenic supergene sphalerite
Geology
By: T.M. Bawden, M.T. Einaudi, B.C. Bostick, A. Meibom, J. Wooden, J.W. Norby, M.J.T. Orobona, and C. P. Chamberlain
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Extreme 34S depletions in ZnS at the Mike gold deposit, Carlin Trend, Nevada: Evidence for bacteriogenic supergene sphalerite |
| Series title | Geology |
| DOI | 10.1130/G19831.1 |
| Volume | 31 |
| Issue | 10 |
| Year Published | 2003 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geology |
| First page | 913 |
| Last page | 916 |
| Google Analytic Metrics | Metrics page |