小塔子沟金矿床1号脉流体包裹体特征研究

Study on characteristics of fluid inclusion of No.1 vein in Xiaotazigou gold deposit

小塔子沟金矿床属于典型的含金石英脉型矿床,其中1号脉是该矿区具代表性的矿脉之一。对小塔子沟金矿床1号脉矿石中的流体包裹体进行了岩相学、显微测温及单个包裹体成分激光拉曼光谱研究。结果表明：矿石中发育CO2包裹体、含CO2三相包裹体和水溶液包裹体等3种类型;成矿过程中,流体经历了NaCl-H2O-CO2体系的不混溶作用;各类包裹体均一温度260～400℃,含CO2包裹体盐度为0.21%～2.42%（NaCl）,气液二相包裹体盐度为5.26%～8.14%（NaCl）,成矿压力68～108 MPa,成矿深度6.67～8.61 km。综合分析认为小塔子沟金矿床为中温深成热液金矿床。

Xiaotazigou gold deposit is a typical gold-containing quartz vein type deposit,in which No. 1 vein is one of the representative veins. Petrography, micro temperature measurement and laser-raman spectrum studies are carried out on the fluid inclusion in No. 1 vein. The results show that there are three types of inclusions, CO2 inclusion, CO2- containing three-phase inclusion and aqueous inclusion. In the mineralization process, the inclusions experienced unmixing action of NaCl- H2O- CO2 system and the homogenization temperature of the inclusions was 260- 400℃. The salinity of CO2 inclusion was 0.21% - 2.42 % （NaCl） and that of air-fluid two-phase inclusion was 5.26 % -8.14 % （NaCl）. The mineralization pressure is 68 -108 MPa and the mineralization depth is 6.67 -8.61 km. Xiaotazigou gold deposit is determined as a moderate temperature katathermal solution one.