闪锌矿LA-ICP-MS微量元素组成对西藏纳如松多铅锌矿床成矿作用的制约  

Genesis of Narusongduo Pb-Zn deposit, Tibet: Constraint from in-situ LA-ICP-MS analyses of minor and trace elements in sphalerite

作　　者：龚雪婧 杨竹森[3] 庄亮亮[4] 马旺[4] GONG XueJing;YANG ZhuSen;ZHUANG LiangLiang;MA Wang(Chinese Academy of Geological Sciences,Beijing 100037,China;SinoProbe Center,Chinese Academy of Geological Sciences and China Geological Survey,Beijing 100037,China;MNR Key Laboratory and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国地质科学院,北京100037 [2]中国地质调查局—中国地质科学院地球深部探测中心,北京100037 [3]中国地质科学院矿产资源研究所自然资源部成矿规律与资源评价重点实验室,北京100037 [4]中国地质科学院地质研究所,北京100037

出　　处：《矿床地质》2019年第6期1365-1378,共14页Mineral Deposits

基　　金：国家重点研发计划“深地资源勘查开采”重点专项（编号：2016YFC0600306）地质调查项目（编号：DD20179172）;国家自然科学基金（编号：41802097）的联合资助

摘　　要：西藏纳如松多铅锌矿床是冈底斯北侧Pb-Zn-Ag-Mo成矿带中规模最大且最为典型的与斑岩系统相关的铅锌矿床,发育有多种矿化样式。本次研究选取该矿床隐爆角砾岩型矿体中的闪锌矿开展LA-ICP-MS微量元素组成研究,发现其中Fe含量不高,不属于高温铁闪锌矿,以富集Cd、Mn、Co,而贫In、Ga、Ge、Se、Te为特征。闪锌矿In/Ga值、In/Ge值及Zn/Cd值指示纳如松多隐爆角砾岩型铅锌矿体形成于中低温环境,且属于热液型矿床的范畴。闪锌矿原位微量元素特征指示纳如松多铅锌矿床的形成主要受到来自于岩浆热液作用的影响和控制,成矿物质主要来自于深部斑岩岩浆系统。The Narusongduo lead-zinc deposit is the largest and most typical Pb-Zn deposit in the Pb-Zn-Ag-Mo metallogenic belt on the northern side of Gangdise belt.It has multiple mineralization styles.In this study,trace elements in sphalerite of the cryptoexplosion breccia type orebody were analyzed by LA-ICP-MS,and the result shows that the Fe content of sphalerite is not high and hence sphalerite does not belong to Fe sphalerite.The sphalerite is characterized by enrichment of Cd,Mn and Co and poor concentrations of In,Ga,Ge,Se and Te.The In/Ga,In/Ge and Zn/Cd ratios indicate that the deposit is a kind of hydrothermal deposit formed in a middle-low temperature environment.The values and discriminant diagram of the characteristic elements in the analyzed sphalerite show that the formation of Narusongduo deposit was mainly controlled and influenced by magmatic hydrothermal activities and the ore-forming material dominantly came from the porphyry magma system.

关 键 词：地球化学 闪锌矿 微量元素组成 LA-ICP-MS 铅锌矿床 西藏 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]