Abstract
Thermodynamic modeling was used to show that the composition of fluids in the anhydrous subsystem of the C-O-S-H system is dominated by COS, CO, and CS2 under reducing conditions (\(f_{O_2 } \) < NNO). At an increase in oxygen fugacity up to NNO to NNO + 1 at T = 900–1100°C and lower crustal pressures, the composition of model fluid reaches the maximum content of elemental sulfur. In the presence of water (more than a few mole percent), the compounds of sulfur and carbon are decomposed to form hydrogen sulfide, this is why their content in volcanic gases is negligible. Fluid dominated by carbon dioxide is characteristic of some basic magmas of subduction zones and flood basalt provinces related to superplumes. It is suggested that, under such geodynamic conditions, the COS, CO, and CS2 components of the fluid dissolve, concentrate, and transport nickel and, possibly, platinum group metals.
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Original Russian Text © A.G. Simakin, 2014, published in Petrologiya, 2014, Vol. 22, No. 1, pp. 50–59.
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Simakin, A.G. Fluid composition in the anhydrous C-O-S system under lower crustal P-T conditions according to thermodynamic modeling. Petrology 22, 45–53 (2014). https://doi.org/10.1134/S0869591114010068
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DOI: https://doi.org/10.1134/S0869591114010068