A DISCUSSION ON THE GENESIS OF DAPINGGOU GOLD DEPOSIT OF XINJIANG, NORTHWEST CHINA

Dapinggou gold deposit,as one of the several recently found in north area of Altyn Mountain,is controlled by ductile shear zone.It is characterized by mainly altered mylonite-type with partly quartz vein-type.Information from REE characteristics shows that the source materials of the deposit are derived mainly from the metamorphic rocks.While inclusion study indicates that the ore fluid comes from dynamic metamorphic water source with a little influence of magmatic and meteoric water.The ore fluid is featured by density of 0.791~0.971 g/cm³ and salinity of 2.36%~5.5%.The gold deposit forms at 1.61~2.68 km below the surface with a temperature of 198~290℃ and pressure of 42~70 MPa.The gold mineralization age is about 200 Ma.So Dapinggou gold deposit is a medium-temperature dynamic metamorphic hydrothermal type formed in Indo-Chinese epoch.