广西建旺铅锌矿床硫化物微量元素组成特征  

Characteristics of trace elements of sulfide in the Jianwang lead-zinc deposit,Guangxi,China

作　　者：周闯 杨振[1] 王新宇 杨富强 吕昶良 宋文睿 吴云柱 ZHOU Chuang;YANG Zhen;WANG Xin-yu;YANG Fu-qiang;LYU Chang-liang;SONG Wen-rui;WU Yun-zhu(School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources by the Province and Ministry,Guilin University of Technology,Guilin Guangxi 541000,China;Guangxi Zhuang Autonomous Region Geological Survey,Nanning 530023,China;Guangxi Zhuang Autonomous Region Geophysical Survey Institute,Liuzhou Guangxi 545000,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074 [2]桂林理工大学有色金属矿产勘查与资源高效利用省部共建协同创新中心,广西桂林541000 [3]广西地质调查院,南宁530023 [4]广西地球物理勘察院,广西柳州545000 [5]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550081

出　　处：《矿物岩石地球化学通报》2023年第2期298-311,共14页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：广西壮族自治区地质矿产勘查开发局2020年部门预算前期地质勘查项目。

摘　　要：广西北山矿田内分布有众多铅锌矿床(点),对这些矿床(点)的地质地球化学研究较为薄弱,其铅锌成矿作用与成矿潜力研究缺少实际依据。建旺铅锌矿床是矿田内重要的矿床之一,为了揭示该矿床闪锌矿和黄铁矿微量元素替换机制、成矿流体特征和矿床成因,探讨区内铅锌成矿作用,本文利用激光剥蚀电感耦合等离子质谱仪(LA-ICP-MS)对建旺铅锌矿床的闪锌矿和黄铁矿进行了原位微量元素分析测试。结果显示,闪锌矿中的Mn、Fe、Cd、Ga、Ge和黄铁矿中的Mn、Co、Ni、As主要通过直接替换或耦合替换机制进入矿物晶格中;闪锌矿中的Ag、Pb和黄铁矿中的Cu、Pb既可以通过固溶体形式,也可以以微米级包裹体形式存在于矿物晶体中;建旺铅锌矿床矿化温度为89~191℃(平均124℃)。此外,建旺矿床闪锌矿中的Mn、Ga、Ge和In组成特征与MVT型矿床较为相似,根据二元模式图和黄铁矿Co/Ni值等特征,结合矿床地质特征和成矿流体性质,本文认为建旺铅锌矿床属于MVT型铅锌矿床。Many Pb-Zn deposits(occurrences)are distributed in the Beishan orefield in Guangxi,China.Their geological and geochemical studies have been undertaken at a relatively low level.Thus,there is no practical basis for studying their Pb-Zn mineralization and evaluating their mineralization potentials.The Jianwang Pb-Zn deposit is one of important deposits in the Beishan orefield.In order to reveal the substitution mechanism of trace elements in sphalerite and pyrite of the deposit,the characteristics of ore-forming fluids and the genesis of the deposit,and to explore the lead-zinc metallogenesis in the area,in situ trace element analysis of sphalerite and pyrite from the Jianwang Pb-Zn deposit has been conducted by using the LA-ICP-MS in this paper.The results show that Mn,Fe,Cd,Ga,and Ge in sphalerite and Mn,Co,Ni,and As in pyrite had entered into these mineral lattices mainly by direct or coupled substitution mechanisms;Ag and Pb in sphalerite and Cu and Pb in pyrite could occur in mineral crystals either as solid solution or as micro-sized inclusions;Mineralization temperatures of the Jianwang Pb-Zn deposit vary from 89℃to 191℃(average 124℃).In addition,compositional characteristics of Mn,Ga,Ge and In in sphalerites of the Jianwang deposit are relatively similar to those of the MVT deposits.Based on the binary model diagram and the Co/Ni values of pyrites,combined with geological characteristics and properties of ore-forming fluids of the deposit,it is believed that the Jianwang Pb-Zn deposit belongs to the MVT deposit.

关 键 词：建旺铅锌矿床 LA-ICP-MS 微量元素 闪锌矿 黄铁矿 

分 类 号：P618.4[天文地球—矿床学] P595[天文地球—地质学]