地质学报2018，Vol.92Issue(3)：560-574,15.
江西牛形坝-柳木坑金银铅锌多金属矿床铋矿物类型及指示意义
The Type of Bismuth Minerals in the Niuxingba-Liumukeng Au-Ag-Pb-Zn Polymetallic Deposit, Jiangxi Province, and Its Geological Significance
摘要
Abstract
The Niuxingba-Liumukeng Au-Ag-Pb-Zn polymetallic deposit in the Yinkeng ore field is located in the Yudu-Ganxian ore cluster area,south Jiangxi Province.Field investigation,systematic mineralographical observation,and electronic probe composition analysis indicate that bismuth is one important associated element in the Niuxingba-Liumukeng Au-Ag-Pb-Zn polymetallic deposit,and occurs as an independent mineral or micro-particles in internal or marginal parts of early formed sulfide.Bi-bearing minerals are versatile,including pavonite,matildite,gustavite,berryite,aikinite,emplectite,krupkaite and tetradymite.Compared with Pangushan quartz vein-type W-Bi deposit in the same ore cluster area,two ore deposits contain two Bi-bearing mineral associations (Pb-Ag-Bi-S and Te-Bi-S),but vary in mineral occurrence and contents.Cu-Pb-Bi element association is found only in the Niuxingba-Liumukeng deposit.The presence of bismuth minerals suggest the deposit belongs to Au-Bi-(low Te)-S system,and formed in the geological environment with medium and low temperature,medium high density and low salinity.Bismuth migrated in the form of sulfide complexes after massive gases escaping and sulfur fugacity increasing which was compelled by boiling ore-forming fluid derived from magma.With precipitation of sulfide (e.g.pyrite),a large amount of sulphur were transferred into gold-bearing minerals and telluride.Further decreasing of temperature and sulfur fugacity during the evolution of ore-forming fluid resulted in deposition of bismuth sulfosalt minerals at the late stage of mineralization.Bi promoted gold migration and enrichment during the process of mineralization.Bi-bearing minerals at the two deposits present some differences in occurrence state,chemical components,forming environment,and precipitation mechanism,suggesting Bi’s preference in ore-forming process and thus playing a significant role in tracing ore-forming material source.关键词
铋矿物/矿物学/指示意义/牛形坝-柳木坑金银铅锌多金属矿床/江西Key words
bismuth minerals/geological significance/Niuxingba-Liumukeng Au-Ag-Pb-Zn polymetallic deposit/Jiangxi Province引用本文复制引用
鲁麟,梁婷,陈郑辉,王登红,赵正,陈伟..江西牛形坝-柳木坑金银铅锌多金属矿床铋矿物类型及指示意义[J].地质学报,2018,92(3):560-574,15.基金项目
本文为国土资源部公益性行业科研专项(编号201411050) （编号201411050）
中国地质调查局项目(编号DD20160346) （编号DD20160346）
国家重点研发计划课题(编号2016YFC0600208) （编号2016YFC0600208）
国家自然科学基金重点资助计划(编号41430314) （编号41430314）
国家自然科学基金项目(编号41372092) （编号41372092）
长安大学“优秀博士学位论文培育资助项目”(编号310827175023)共同资助成果. （编号310827175023）
