Physical and Chemical Parameters of The Ore-Forming Process of The Chertovo Koryto Deposit

Abstract

Summary The purpose of this work is obtain additional information about the features of fluid inclusions, which makes it possible to cl arify the thermobarochemical parameters of the processes that contributed to the formation of the ore bodies of the Chertovo Koryto deposit. It was carried out inclusions in different types of quartz, their composition, cryotermetric studies, and the data obtained was compared with those already known to determine thermobarogeochemical criteria for the difference between ore and post-ore quartz. Gold-bearing quartz-sulphide veins were formed from a fluid characterized by a temperature of the order of 380–440 ° C, and a salinity of a solution of 4 wt. % NaCl-eq. With the active participation of carbon dioxide. At an early stage, gold was carried by a carbon dioxide fluid formed as a result of carbon decarbonisation during the destruction of the organic matter of the enclosing black shale deposits with their subsequent localization on geochemical barriers. Post-ore quartz veins were formed due to a fluid with a temperature not exceeding 160 °C and salinity of the solution not exceeding 2.0 wt. % NaCl-eq., with a significant decrease in the proportion of carbon dioxide in the gas component and an increase in the proportion of N2 and CH4. The predominant role of CO2, CH4 and N2 in the composition of inclusions is a reflection of the confinement of quartz veins to black shales with a significant content of organic matter.