Chalcocite Cu2S solubility in aqueous sulfide and chloride fluids. Thermodynamic properties of copper(I) aqueous species and copper transport in hydrothermal systems

Nikolay D. Trofimov,Boris R. Tagirov,Nikolay N. Akinfiev,Vladimir L. Reukov,Maximilian S. Nickolsky,Irina Yu. Nikolaeva, Maria E. Tarnopolskaya,Andrey A. Afanasyev

Chemical Geology（2023）

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摘要

The most important Cu reserves, including ores of porphyry deposits, were formed by Cl- and S-bearing hydrothermal fluids transporting and depositing metals within the magmatic-hydrothermal ore systems. In order to determine the state of Cu in the fluids, we measured the solubility of chalcocite Cu2S at 350 and 450 °C, 500 and 1000 bar. The concentration of H2S varied from 0.08 to 0.4 m [mol⋅(kg H2O)−1], NaOH – from 0 to 0.2 m, NaCl + HCl – from 0.01 to 4 m. The solubility of chalcocite can be described by the reactions:

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关键词

Copper,Hydrothermal fluids,Chaclocite,Solubility,Hydrosulfide complexes,Chloride complexes,Stability constants,Thermodynamic properties

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