GEOLOGICAL CHARACTERISTIC AND GENESIS OF XIANJIN CHANG GOLD DEPOSITE, QINGYUAN COUNTY, LIAONING PROVINCE

Xianjin chang gold deposit occuring in Archaeozoic charnohite and tonalite is near Zhuang xianghu quartz-diorite stock, which is Mesozoic in age. In the mine field, the dikies included basic, medium and acid rooks were widely distributed. Both the stock and the dikies have high gold abundancec, which are much higher than the clarke value. The gold deposit is consist of several auriferous quartz-veins, which are related geneticly to the dikies in spatial position and age. The compositions of sulphur isotope of the gold deposit are δ³⁴S=2.08‰-10.5‰, which descend gradually due to the increase of the distance from auriferous quartz-veins to the zhuangxianghu stock. Ore lead isotopic compositions of various auriferous quartz-veins are stable, which indicate the ore-forming metal of various ore veins come from the same source. On the δD-δ¹⁸O diagram, the ore-forming fluid of Xian jinchang gold deposit are plotted near the magmatic water field, indicating that most part of the ore-forming fluid belonged to magmatic hydrothermal fluid and little part came from underground hydrother-mal fluid. According to above date, the Xian jinchang gold deposit is thought as magmatic hydrothermal gold deposit, which related to Zhuangxanghu stock in genesis.