Abstract
According to Sakai-Ohmoto's theory regarding the evolution of sulfur isotopes in hydrothermal systems, in conjunction of new data on chemical resaction equilibrium constants and equilibrium isotopic fractionation factors as well as on individual ion activity coefficients of aqueous sulfur species, the following lgfo2.-pH diagrams are constructed: a) mole fractions of aqueous sulfur species (X i ), b) stability fields of some minerals in the Fe-S-O system, c) diagram depicting the oxidation-reduction-state ratio for aqueous sulfur species (R′) d) isotopic compositions of sulfur compounds (\(\delta S_1 ^{34} \)).
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