江西盘古山钨矿床的碲化物特征及富集成因  

Telluride minerals and their genesis in Pangushan tungsten deposit,Jiangxi Province

作　　者：吴家旭 方贵聪 杨明 童启荃 叶武 陆显盛 WU JiaXu;FANG GuiCong;YANG Ming;TONG QiQuan;YE Wu;LU XianSheng(Guangxi 305 Nuclear Geological Team,Liuzhou 545005,Guangxi,China;Guangxi Key Laboratory of Hidden Metallic Ore De‐posits Exploration,College of Earth Science,Guilin University of Technology,Guilin 541004,Guangxi,China;Jiangxi Pangushan Tungsten Co.,Ltd.,Yudu 342311,Jiangxi,China)

机构地区：[1]广西壮族自治区三〇五核地质大队,广西柳州545005 [2]桂林理工大学地球科学学院,广西隐伏金属矿产勘查重点实验室,广西桂林541004 [3]江西盘古山钨业有限公司,江西于都342311

出　　处：《矿床地质》2021年第4期805-818,共14页Mineral Deposits

基　　金：国家自然科学基金项目(编号:41802082);中国地质调查局中国矿产地质志项目(编号:DD20190379);广西自然科学基金项目(编号:2020GXNSFAA159154)联合资助。

摘　　要：江西盘古山钨矿是一个钨、铋、碲均可综合利用的大型矿床,有关其碲化物的特征及成矿流体的物理化学条件研究尚属空白。文章在整理和总结前人研究成果的基础上,对矿床中碲化物开展了详细的矿相学鉴定、电子探针和流体包裹体测温。结果显示,盘古山钨矿床的碲化物主要有硫碲铋矿A、硫碲铋矿B、应硫碲铋矿、巴硫碲铋矿、硫楚碲铋矿及辉碲铋矿。矿床碲化物由浅至深有依次出现硫碲铋矿A、巴硫碲铋矿、硫碲铋矿B、应硫碲铋矿、硫楚碲铋矿、辉碲铋矿的趋势,矿物逐渐富Te元素而贫Bi、S元素。流体包裹体测温显示碲化物最小捕获温度为152~395℃,碲逸度为-11.0<logf(Te_(2))<-7.1,硫逸度为-12.54<logf(S_(2))<-9.39。研究认为,温度和f(S_(2))的降低,及f(Te_(2))/f(S_(2))的相对增大是碲化物沉淀的关键因素。碲化物的空间分带可能是随着成矿流体物化条件的变化导致Bi_(2)S_(3)-PbS矿物系列中Bi被Pb置换、S被Te置换的结果。Pangushan tungsten deposit in Jiangxi Province,is a large mineral deposit in which tungsten,bismuth and tellurium are available.On the basis of colleting and summarizing the previous research results,this article aims at the shortcomings in the study of telluride in the Pangushan tungsten deposit by the detailed mineralographic identification,electron probe analysis and fluid inclusion temperature measurement.The results show that the tel‐lurides in the Pangushan tungsten deposit mainly include joseite A,joseite B,ingodite,baksanite,sulphotsumoite and tetradymite.These tellurides were successively found in the deposits from shallow to deep parts,suggesting enriched Te and depleted Bi and S.The minimum trapping temperature of telluride is between 152℃and 395℃,telluride fugacity(logf(Te_(2)))is in the range of-11.0~-7.1,and the sulfur fugacity(logf(S_(2)))varies from-12.54 to-9.39.the gradually decreased temperature and f(S_(2))values,but relative increased of f(Te_(2))/f(S_(2))are critical fac‐tors for the precipitations of tellurides in the Pangushan tungsten deposit.The spatial zonation of tellurides may be the result of Bi being replaced by Pb and S being replaced by Te in the Bi_(2)S_(3)-PbS mineral series with the change of mineralization fluid physicochemical conditions.

关 键 词：地球化学 碲化物 电子探针 流体包裹体 钨矿床 盘古山 

分 类 号：P618.67[天文地球—矿床学] P618.83[天文地球—地质学]