Gold Solubility in Reduced Carbon-Bearing Fluid

— The paper presents first experimental data on gold solubility in CO–CO 2 and C–O–S fluids with a low H 2 O concentration under reduced conditions, a pressure of 200 MPa, and a temperature of 950°C. Gold solubility in C–O–S fluid is approximately 27 ppm. The estimate of gold solubility in CO–CO 2 f...

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Bibliographic Details
Published in:Geochemistry international 2019-04, Vol.57 (4), p.400-406
Main Authors: Simakin, A. G., Salova, T. P., Gabitov, R. I., Kogarko, L. N., Tyutyunnik, O. A.
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon monoxide
Earth and Environmental Science
Earth Sciences
Fluids
Geochemistry
Gold
Heavy metals
Intrusion
Metals
Mineralization
Noble metals
Olivine
Oxidation
Platinum
Solidus
Solubility
Temperature
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Summary:— The paper presents first experimental data on gold solubility in CO–CO 2 and C–O–S fluids with a low H 2 O concentration under reduced conditions, a pressure of 200 MPa, and a temperature of 950°C. Gold solubility in C–O–S fluid is approximately 27 ppm. The estimate of gold solubility in CO–CO 2 fluid with 10–15 mol % CO is less accurate, and the solubility is no lower than 2–3 ppm but may reach 200–300 ppm. The high gold solubility in reduced CO 2 fluid determined in the course of this research, and our earlier estimates of high platinum solubility (Simakin et al., 2016), may explain the deposition of mineralization of these noble metals in the Guli intrusion, polar Siberia, as a result of fluid extraction of these metals and their redeposition at a temperature slightly below the solidus. The reduction of the largely oxidized CO 2 fluid, which was determined using mineralogical sensors, was likely related to the subsolidus oxidation of olivine.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702919040104