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.
Suggested Citation
Bawden, T., Einaudi, M., Bostick, B., Meibom, A., Wooden, J., Norby, J., Orobona, M., and Chamberlain, C., 2003, Extreme 34S depletions in ZnS at the Mike gold deposit, Carlin Trend, Nevada: Evidence for bacteriogenic supergene sphalerite: Geology, v. 31, no. 10, p. 913-916, https://doi.org/10.1130/G19831.1.
| 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 |