| Abstract: | Acid sulfate wall-rock alteration, characterized by the assemblage alunite + kaolinite + quartz ?? pyrite, results from base leaching by fluids concentrated in H2SO4. Requisite amounts of H2SO4 can be generated by different mechanisms in three principal geologic environments: 1) by atmospheric oxidation of sulfides in the supergene environment, 2) by atmospheric oxidation at the water table in the steam-heated environment of H2S released by deeper, boiling fluids, and 3) by the disproportionation of magmatic SO2 to H2S and H2SO4 during condensation of a magmatic vapor plume at intermediate depths in magmatic hydrothermal environments in silicic and andesitic volcanic terranes. In addition, coarse vein alunite may form in a magmatic steam environment. -from Authors |
| Genre: | Article |
| ProdID: | 70016673 |
| Citation Author: | Rye, R. O.; Bethke, P. M.; Wasserman, M. D. |
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| Citation End Page: | 262 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Economic Geology |
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| Citation Number Of Pages: | 38 |
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| Citation Search Results Text: | The stable isotope geochemistry of acid sulfate alteration; 1992; Article; Journal; Economic Geology; Rye, R. O.; Bethke, P. M.; Wasserman, M. D. |
| Citation Start Page: | 225 |
| Citation Volume: | 87 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | The stable isotope geochemistry of acid sulfate alteration; 1992; Article; Journal; Economic Geology; Rye, R. O.; Bethke, P. M.; Wasserman, M. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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