Commentary on the sphalerite geobarometer
American Mineralogist
By: P. Toulmin III, P. B. Barton Jr., and L.B. Wiggins
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Abstract
The FeS content of sphalerite in assemblages with pyrite and pyrrhotite has been widely used and widely criticized as a geobarometer. The commonly accepted form of the geobarometer is based on the composition of sphalerite being independent of temperature below about 550??C at all pressures up to at least 10 kbar, but strong thermodynamic arguments require a significant temperature dependence in this region. Most minor components have a negligible effect on the relevant equilibria, but the effect of CuS is somewhat more significant. Molar and partial molar volumes for binary (ZnS-FeS) and ternary (ZnS-FeS-CuS) sphalerite solutions are presented; the ternary data are consistent with charge transfer between Cu and Fe. -from Authors
Suggested Citation
Toulmin, P., Barton, P.B., Wiggins, L., 1991, Commentary on the sphalerite geobarometer: American Mineralogist, v. 76, no. 5-6, p. 1038-1051.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Commentary on the sphalerite geobarometer |
| Series title | American Mineralogist |
| Volume | 76 |
| Issue | 5-6 |
| Year Published | 1991 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | American Mineralogist |
| First page | 1038 |
| Last page | 1051 |