ARSENIC MINERALS AS INDICATORS OF CONDITIONS OF GOLD DEPOSITION IN CARLIN-TYPE GOLD DEPOSITS.
Journal of Geochemical Exploration
By: James J. Rytuba
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Abstract
Arsenic minerals commonly occurring in Carlin-type gold deposits include orpiment and realgar and, more rarely, native arsenic and arsenopyrite. Other arsenic-bearing phases present include arsenian pyrite and stibnite and a number of thallium and mercury sulfides. Under conditions of constant temperature and pressure, the relative stability of arsenic minerals is a function of sulfur activity. At high sulfur activity, orpiment is the stable phase. As sulfur activity is decreased, more sulfur-deficient arsenic phases become stable with the progressive formation of realgar, native arsenic, arsenopyrite, and finally, loellingite at very low sulfur activity. Three univariant equilibrium assemblages: orpiment plus realgar, realgar plus native arsenic and native arsenic plus arsenopyrite are useful indicators of sulfur activity and commonly occur in the epithermal environment.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | ARSENIC MINERALS AS INDICATORS OF CONDITIONS OF GOLD DEPOSITION IN CARLIN-TYPE GOLD DEPOSITS. |
| Series title | Journal of Geochemical Exploration |
| Volume | 25 |
| Issue | 1-2 |
| Year Published | 1984 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geochemical Exploration |
| First page | 237 |
| Last page | 238 |
| Conference Title | Explor for Ore Dep of the North Am Cordillera, Sel Pap of the Symp of the Assoc of Explor Geochem |
| Conference Location | Reno, NV, USA |
| Conference Date | 25 March 1984 through 28 March 1984 |
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