Geochemical conditions of vein quartz formation of gold deposits of Manitanyrd region

In order to determine mineral-forming conditions we have studied gas-liquid inclusions in transparent minerals presented in gold-bearing and barren veins from two deposits: Verkhneniyayuskoye-1 and Verkhneniyayuskoye-2. It was established that thermobarogeochemical characteristics of vein quartz have no differences between gold-bearing and barren varieties of this mineral. Monophase water inclusions are typical of them; homogenizing temperatures of two-phase inclusions are about 70-390°С. Design pressure is about 1-200 kg/cm2. Salt structure in inclusions is homogeneous. Eutectic temperature of the inclusions is about -23 and -35°С that corresponds to water-salt systems NaCl-KCl-H2O and NaCl-MgCl2-H2O. Isotope composition of inclusions in quartz are the evidence of two sources for mineral formation- pallial and crustal.