湖北省陨西县三天门金矿床包裹体-同位素地球化学及成矿流体特征

通过矿床流体包裹体岩相学、显微测温学和包裹体激光拉曼光谱分析研究成矿流体性质,探讨矿床成因类型。研究结果表明,流体包裹体有气液两相、含纯液相和纯气相包裹体3种类型。气相成分以CO2为主,其次为H2O,总体属CH4-H2O-CO2体系;结合氢氧同位素地球化学特征（δD值为-64.1‰～-124.4‰;δ18O值为1.34‰～-6.96‰）,确定成矿流体是岩浆热液与大气降水的混合流体。含矿硫（δ34S）指示硫主要为深部岩浆来源,并经历了陆壳硫的混染,包裹体均一温度以240℃～270℃区间为主,属中低温热液矿床。

Geochemistry of inclusion and isotope and mineralization fluid feature of Santianmen gold deposit in Yunxixian, Hubei province

Santianmen gold deposit is located at the south Qingling drape zone of Qingling drape system. The geological and geochemical feature is definitely different from mixed hydrothermal gold deposit of lower temperature. The mineralization fluid is studied by deposit lithoface,microscopic temperature measurement and Laser Raman spectrographic analysis of the fluid inclusions. The result indicates that there are 3 kinds of fluid inclusions,gas and liquid face,pure liquid face and pure gas face. The main gas component is carbon dioxide and water in the second. It is belonged to CH4-H2O-CO2 system. According to geochemical feature of hydrogen and oxygen isotope,the mineralization fluid is determined to be mixed fluid of magma hydrothermal and atmosphere water. δ34S indicates that the sulfur is mainly origin of deep magma source,mixed with continental crust sulfur. Homogenization temperature of the fluid inclusion is 240℃—270℃. It is a hydrothermal deposit of low-medium temperature.