Chemical and stable isotopic geochemical characteristics of ore-forming fluid of the Shizishan copper and gold ore-field,Tongling,China  

作　　者：陆三明 徐晓春 谢巧勤 楼金伟 储国正 熊亚平 

机构地区：[1]School of Resources and Environmental Engineering,Hefei University of Technology [2]Hefei 230009,China [3]Bureau of Geology and Mineral Resources Exploration of Anhui Province [4]Hefei 230001,China

出　　处：《岩石学报》2007年第1期177-184,共8页Acta Petrologica Sinica

基　　金：the National Natural Science Foundation of China （ No. 40472052） is sincerely acknowledged.

摘　　要：Shizishan ore-field is a nonferrous and noble metal ore-field which is most rich in copper and gold.There are many types of fluid inclusions in minerals of the deposits.The homogeneous temperatures and the salinities of the fluid inclusions in main mineralization stages have wide ranges,while the different types of the fluid inclusions existed together and their homogeneous temperatures are almost identical in the same mineralization stage,which indicates that the ore-forming process has great relation with the fluid boiling.The gas and liquid chemical compositions and the carbon,hydrogen and oxygen isotopic compositions of the fluid inclusions show that the ore-forming fluids of copper-gold deposits have the same characteristics and evolution tendency,which reflects that the ore-forming material mainly came from the magmatism.The stratigraphic component and the meteoric water may mix in ore- forming fluids in the later mineralization stages.Furthermore,with the fall of the ore-forming temperature the ratios of water and rock decreased.The characteristics of chemical composition and carbon isotopic composition of fluid inclusions indicate that CH4 may play an important role for separating copper and gold in the ore-forming process.Shizishan ore-field is a nonferrous and noble metal ore-field which is most rich in copper and gold. There are many types of fluid inclusions in minerals of the deposits. The homogeneous temperatures and the salinities of the fluid inclusions in main mineralization stages have wide ranges, while the different types of the fluid inclusions existed together and their homogeneous temperatures are almost identical in the same mineralization stage, which indicates that the ore-forming process has great relation with the fluid boiling. The gas and liquid chemical compositions and the carbon, hydrogen and oxygen isotopic compositions of the fluid inclusions show that the ore-forming fluids of copper-gold deposits have the same characteristics and evolution tendency, which reflects that the ore-forming material mainly came from the magmatism. The stratigraphic component and the meteoric water may mix in oreforming fluids in the later mineralization stages. Furthermore, with the fall of the oreforming temperature the ratios of water and rock decreased. The characteristics of chemical composition and carbon isotopic composition of fluid inclusions indicate that CH4 may play an important role for separating copper and gold in the ore-forming process.

关 键 词：铜陵狮子山铜金矿田 成矿 流体成分 稳定同位素 地球化学 

分 类 号：P597[天文地球—地球化学]