Ore geology, fluid inclusion and Ar-40/Ar-39 geochronology constraints on the genesis of the Yingchengzi gold deposit, southern Heilongjiang Province, NE China

摘要

The Yingchengzi gold deposit, located at the eastern margin of the Zhangguangcai Range, southern Heilongjiang Province, NE China, is the only high-grade gold deposit in the region. The deposit is hosted in mylonitized Paleozoic granite and metavolcanic rocks and is structurally dominated by brittle-ductile shear zones and faults. The orebodies consist of gold-bearing quartz veins and gold-bearing altered mylonites. The hydrothermal ore-forming process can be divided into early, middle and late stages, characterized by quartz-pyrite veins, quartz-gold-polymetallic sulfide veins, and quartz-carbonate veins or veinlets, respectively. Ore minerals and gold mainly occurred in the middle stage.