Study on Shaxi porphyry copper-gold deposit in Anhui:gold mineralization and occurrence determination by PIXE  

作　　者：杨晓勇 李勋贵 黄德志 王奎仁 

机构地区：[1]School of Earth and Space Sciences [2]Jewelery Department [3]College of Geology and Environmental Engineering

出　　处：《Journal of Central South University of Technology》2003年第4期352-358,共7页中南工业大学学报（英文版）

基　　金：Project (G19990 4 32 0 4)supportedbytheNationalKeyFundamentalResearchandDevelopmentProgramofChinaandprojectsupportedbyMaxPlanckInstitutederWissenschaftenandCAS

摘　　要：Shaxi porphyry Cu-Au deposit was one of the important discoveries of the exploration in the middle-lower reaches of Yangtze River in China in 1970s. Gold occurrence in the Shaxi porphyry copper-gold deposit (central (Anhui) province, eastern China) was investigated by means of microscope analyses, EPMA and PIXE. Combined with geological and mineralogical methods, the characteristics of occurrence of gold in the large scale sulfide mineralization in this region were fully investigated. The results show that gold distributes in both chalcopyrite and pyrite as submicroscopic inclusions (less than 1 μm) . Au is positively correlated with As, Fe, S, Cu, Zn and Ti. The condition of gold transformation in thermal fluid system controlling deposition of Au in the region is probably the oxidation potential of the red sedimentary rocks of shale and fine grain sandstone which may be crucial as a geochemical barrier to the reducing fluid. This study lays foundation for the further research and exploration of the porphyry copper-gold deposit both theoretically and practically in the lower reaches of Yangtze region.Shaxi porphyry Cu-Au deposit was one of the important discoveries of the exploration in the middle-lower reaches of Yangtze River in China in 1970s. Gold occurrence in the Shaxi porphyry copper-gold deposit (central (Anhui) province, eastern China) was investigated by means of microscope analyses, EPMA and PIXE. Combined with geological and mineralogical methods, the characteristics of occurrence of gold in the large scale sulfide mineralization in this region were fully investigated. The results show that gold distributes in both chalcopyrite and pyrite as submicroscopic inclusions (less than 1 μm) . Au is positively correlated with As, Fe, S, Cu, Zn and Ti. The condition of gold transformation in thermal fluid system controlling deposition of Au in the region is probably the oxidation potential of the red sedimentary rocks of shale and fine grain sandstone which may be crucial as a geochemical barrier to the reducing fluid. This study lays foundation for the further research and exploration of the porphyry copper-gold deposit both theoretically and practically in the lower reaches of Yangtze region.

关 键 词：EPMA PIXE gold OCCURRENCE Shaxi PORPHYRY CU-AU deposit ANHUI 

分 类 号：P618.2[天文地球—矿床学]