Geological Characteristics and Ore-controlling Factors of the Shiwuliqiao Gold Deposit in Tahe,Heilongjiang Province

The Shiwuliqiao gold deposit of Tahe County,Heilongjiang Province,located in the southern edge of the Heilongjiang foreland basin,is a volcanic rock-type gold deposit with a great prospecting potential that was found recently. This deposit exhibits typical features of epithermal-type deposits, and the gold mineralization is closely related to the quartz veins and the ore bodies within the andesites,mainly appearing in veins and strictly controlled by the NE trending faults and the breccias zone. The andesite and the ryholite in the mining area belong to aluminum shoshonite series and the ryholite porphyry belongs to aluminum high-K calc-alkaline series,both of which were the crystallization products of homologous magma. This gold deposit formed in an early Cretaceous extensional environment,and the metallogenic materials mainly derived from andesite rocks,the primary source of gold mineralization was deep magmatic activity and dykes in the region,and the ore-forming fluid was mainly from atmosphere precipitation. Through analyzing the degree of denudation in the mining area,we infer that the degree of denudation decreases from the east to the west and the deep part in the west of the mining area has large prospecting potential.