Calculated low-temperature phase equilibria in system ZnS-PbS-FeS-H2S

This paper mainly introduces the application of thermodynamic phase diagrams in epithermal sulfide deposit, as a case study in Jinding lead-zinc deposit, Sanjiang area. On the one hand, the thermodynamic phase diagrams show the relations between concentration and mineral (assemblage) in the constant temperature, for example, the assemblage of pyrite and galena is stable under alkaline environment at 400K and 10(5) Pa, whereas the assemblage of galena and sphalerite is stable under acid environment at 400K and 10(5) Pa; on the other hand, this paper contrasts the different assemblage and pH conditions between 298. 15K and 400K, and concludes that the crystallization of mineral (assemblage) needs much higher concentration at 400K.