琼西戈枕剪切带金矿同位素地球化学

琼西戈枕剪切带控制的金矿床，产于前寒武系变质岩系中，区域上沿构造带呈北东向展布，从北东南南西有土外山－抱板金矿区，二甲金矿区和不磨金矿区等，构成了海南岛目前最有工业价值的金矿成矿带。对该成矿带典型矿床同位素地球化学的研究，表明其成矿物质主要来自抱板群混合岩系，但有部分深源物质的叠加；成矿流体主要是混合岩化热液和大气降水热液的混合，局部有岩浆热液参与，其深部物质和岩浆热液的叠加受剪切带变形环境和后期岩浆活动的控制；同位素组成在该区域有明显变化规律，并与构造变形，变质作用及其演化特点有关，这对剪切带与金矿成矿，成矿规律和成矿预测有重要意义。

Isotope Geochemistry of Gold Mineralization in Gezhen Shear Zone,Hainan,China

The gold deposits of Tuwaishan,Baoban,Erjia,Bumo,etc.in western Hainan are formed in metamorphic clastic rocks of Precambrian age and are controlled by Gezhen shear zone.The research results show that the metallogenic matter was mainly from the magmatic rocks of Baoban Group and partly from the depths.The metallogenic fluid was mainly a mixture of magmatic hydrothermal water and meteoric hydrothermal waters,and was partly telescoped by magmatic water.The telescoping of the deep resource matter and magmatic waters was controlled by deformation environments of the shear zone and magmatic activity.The changes of isotope composition are clear and closely related to tectornic deformation,metamorphism and magmatism and their evolution.This is conducive to deep studies of the shear zone,gold mineralization and prospecting of gold deposits in this region.