Scientific journal
Scientific Review. Geographical Sciences

GOLD TRANSFER IN METAMORPHIC-HYDROTHERMAL ORE FORMATION IN BLACK SHALES

Брюханова Н.Н., Бычинский В.А., Будяк А.Е.
The physical-chemical model of formation of «Sukhoy Log» gold ore deposits has been developed. The calculations were performed by minimizing the Gibbs free energy with Selector-C software complex. The results of thermodynamic calculations are applied for qualitative and quantitative evaluation of gold removal from host rocks and its accumulation in the ore zone, regardless of the initial composition of hydrothermal fluid entering the system. Three types of hydrothermal fluid: (1) catagenic fluid, (2) sea water, (3) atmogenic water were recognized. The simulation was performed under temperature 375 - 190 °C and pressures 2100 to 300 bar. Calculations showed that maximum accumulation of gold (Au-Ag) occurred in the ore zone simulated with sea water, and formation of high fineness gold (Au -89% in Au-Ag) in the models with catagenic fluid.