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According to Sakai-Ohmoto’s theory regarding the evolution of sulfur isotopes in hydro-thermal systems,in conjunction of new data on chemical resaction equilibrium constantsand equilibrium isotopic fractionation factors as well as on individual ion activity coeffi-cients of aqueous sulfur species,the following lgfo_2-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’) andd)isotopic compositions of sulfur compounds (δS_i~(34)).
According to Sakai-Ohmoto’s theory regarding the evolution of sulfur isotopes in hydro-thermal systems, in conjunction of new data on chemical res equilibrium equilibrium constants and equilibrium isotopic fractionation factors as well as on individual ion activity coeffi-cients of aqueous sulfur species, the following lgfo_2 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 ’) andd) isotopic compositions of sulfur compounds (δS_i ~ (34)).