Fluid mode of gold-telluride-palladium mineralization formation in Krutoy deposit (Pay-Khoy)

For the first time we studied the conditions of formation of gold-telluride-palladium mineralization in Krutoy deposit. It is confined to the central part of khengursky basalt complex. This deposit is represented by a NW elongated gabbro-dolerite body located in Middle Ordovician argillaceous shales. The gold-telluride-palladium mineralization is mainly associated with quartz-chalcopyrite veins. The mineral-forming fluid is characterized by a very low gas saturation. According to the composition of the gas phase the inclusions are divided into nitrogen-methane and carbon dioxide-nitrogen. The mineral-formation fluids are dominated by magnesium and calcium salts. We determined that the formation temperature of the vein quartz was close to 300-490 °C. The sulfide and associated gold-telluride mineralization was formed at lower temperatures, less than 260 °C.