CHARACTERISTICS OF PYRITES AND ARSENOPYRITES OF JINLONGSHAN SEDIMENT-HOSTED GOLD DEPOSIT, SOUTHERN QINLING MOUNTAIN

Jinlongshan gold deposit exists in upper Paleozoic fined clastic to carbonate formation of Zhen'an-Xunyang, southern Qinling Mountain. Grain size of arsenopy rites and arsenian pyrites, which are main gold-carrying minerals, are mostly 10~100 μm. Arsenian pyrites are usually as overgrow thrim of strawberry-like or coccus-like pyrite that formed during sedimentation and diagenesis.Then it's difficult to separate straw berry-like and coccus-like pyrites from hydrothermal stage's pyrites and arsenopy rites. Arsenopyrites have the highest gold content. Strawberry-like and coccus-like pyrites are poor in As and maybe also deficient in Au. Pyrites of mineralization stage are poor in sulfur, while arsenopyrites are poor in arsenic.Gold and arsenic may come from deep with hydrothermal solution. Straw berry-like and coccus-like pyrites may provide some sulfur. Thermoelectricity coefficient of pyrites varies greatly. Sulfur isotope of sulfides mostly concentrates between 6‰ and 17‰. Lead isotope is characteristically as orogenic zone, close to mercury and antimony mineralization. Metallogenic process of gold and antimony is related to deep and large faults.