云南金顶铅锌矿床硫化物电子探针分析及其对矿床成因的指示  

Electron microprobe analysis of sulfide and its implication on genesis of Jinding lead zinc deposit in Yunnan Province

作　　者：李相材 王京彬[1,3] 祝新友 吕晓强 石珉 LI Xiangcai;WANG Jingbin;ZHU Xinyou;LYU Xiaoqiang;SHI Min(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Beijing Institute of Geology For Mineral Resources,Beijing 100012,China;Sinotech Minerals Zijin Exploration Co.,Ltd.,Beijing 100012,China;China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]北京矿产地质研究院有限责任公司,北京100012 [3]中色紫金地质勘察有限责任公司,北京100012 [4]中国地质大学(武汉),湖北武汉430074

出　　处：《地质通报》2022年第4期626-641,共16页Geological Bulletin of China

基　　金：中国铜业有限公司重点科技计划项目《云南兰坪金顶铅锌矿资源潜力评价》(编号:[2019]048)。

摘　　要：金顶铅锌矿床位于滇西兰坪思茅盆地北部,为世界级超大型铅锌矿床。应用电子探针分析(EPMA)技术测定了金顶铅锌矿床中不同矿段(北厂、跑马坪、白草坪)黄铁矿、闪锌矿的微量元素组成,探讨金属硫化物的地球化学特征、矿床成矿环境,从而为研究区矿床成因提供依据。结果表明,各个矿段不同寄主岩石中黄铁矿相对富集Pb、Zn、Co,贫Cu、Cd、Ni、Sb、Te等微量元素,闪锌矿相对富集Cd、Pb等微量元素,贫Fe、Mn、Ag、Cu、Sb等。微量元素Cd、Fe、Mn、Sb、Cu、Pb、Co、Zn等可能以类质同象、矿物包体及多种形式赋存于金属硫化物中。硫化物微量元素特征显示其主要形成于中低温,成矿温度自白草坪-北厂-跑马坪呈现上升特征,具盆地卤水特征。综合矿床地质特征及微量元素特征,表明金顶铅锌矿床应属于密西西比河谷型(MVT)矿床一类。The Jinding lead-zinc deposit is located in the northern of the Lanping-Simao Basin in western Yunnan,which is a world-class super large lead-zinc deposit.The electron probe microanalysis(EPMA)technology was used to determine the trace element composition of pyrite and sphalerite in different ore sections of the Jinding lead-zinc deposit in this paper(Beichang,Paomaping and Baicaoping).This paper discusses the geochemical characteristics of metal sulfide and the metallogenic environment of the deposit,which provide a basis for the genesis of the deposit in the study area.The results show that the different host rocks in each ore section are relatively enriched in Pb,Zn and Co,but poor in trace elements,such as Cu,Cd,Ni,Sb and Te,while sphalerite is relatively enriched in Cd and Pb,but poor in trace elements,such as Fe,Mn,Ag,Cu and Sb.Trace elements,such as Cd,Fe,Mn,Ni,Sb,Cu,Pb,Co and Zn,could occur in sulfides as isomorphism,mineral inclusions or various forms.The characteristics of trace elements of sulfides show that there are mainly formed at medium and low temperature.The mineralization temperature shows rising characteristics from Baicaoping to Beichang to Paomaping,which has the characteristics of basin brine.According to the geological and trace element characteristics of the deposit,Jinding lead-zinc deposit should belong to MVT deposit.

关 键 词：金顶铅锌矿 电子探针 矿床成因 硫化物 云南 

分 类 号：P575.1[天文地球—矿物学] P618.42[天文地球—地质学]