大水金矿床金的迁移形式和沉淀机制探讨  

MIGRATION FORMS AND DEPOSITION MECHANISMS OF GOLD IN DASHUI GOLD DEPOSIT

作　　者：朱光儒 王志虎 芝世玉 孟凡敏 

机构地区：[1]甘肃省地矿局第三地勘院,甘肃兰州730050

出　　处：《甘肃地质》2014年第2期41-45,共5页Gansu Geology

摘　　要：基于大水金矿床地质特征和矿物流体包裹体显微测温研究成果,对金在成矿过程中的迁移形式和沉淀机制进行了探讨。研究认为,金矿床在主成矿作用过程中金主要以AuC12-、Au(HS)2-、AuH3SiO40形式迁移,少量以硫络合物、硫氢络合物、胶体溶液、砷络合物(配合物)及地幔流体等形式迁移。推断水—岩反应(尤其是硅化和硫化作用)和以深部流体为主与古大气水的均一化流体的混合作用以及在此过程中的降温减压作用是金沉淀的重要机制。Base on geologic features of Dashui gold deposit and the micro thermometry analysis of mineral fluid inclusions, the thesis studied the migration forms and the deposition mechanisms of gold in the ore forming process. The study suggested that gold migrates in the form of AuC12-, Au（HS）2-, AuH3SiO40in the main oreforming process of the gold deposit. A small amount of gold migrates in the form of sulfur complexes, sulfur hydrogen complex, colloidal solution, arsenic complex（the coordination complex） and mantle fluids. We can infer that the deposition mechanisms of gold are fluid-rock interaction（especially sulfide and sulfuration）, the migmatization of homogenized fluids of the ancient meteoric water with the deep fluid and the temperature pressure relief effect in this process.

关 键 词：含金络合物 迁移形式 沉淀机制 金矿床 甘肃大水 

分 类 号：P618.51[天文地球—矿床学]