Physicochemical Conditions of Quartz Formation at the Bazov Gold-Ore Deposit (East Yakutia, Russia)

The evolution of the hydrothermal system forming the Bazov gold-ore deposit is traced by the data on the composition and properties of the fluid inclusions within the veined quartz. The gold-bearing quartz veins were formed under a moderate decrease of temperature from 290 to 230°C and considerable decrease of pressure from 0.75 to 0.25 kbar. The pressure drop was accompanied by the volume crystallization of quartz from SiO2-saturated...