西藏达龙钨钼多金属矿床微量元素地球化学特征及其地质意义  

Geochemical characteristics and geological significance of trace elements of Dalong tungsten and molybdenum polymetallic deposit,Tibet

作　　者：吴小雷 徐庆鸿[2] 刘耀辉 迟占东 覃鹏 孙广沅 姜海 WU Xiaolei;XU Qinghong;LIU Yaohui;CHI Zhandong;QIN Peng;SUN Guangyuan;JIANG Hai(China Nonferrous Metals(Guilin)Geology and Mining Co.,Ltd.,Guilin 541004,Guangxi,China;College of Earth Science,Guilin University of Technology,Guilin 541006,Guangxi,China)

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541004 [2]桂林理工大学地球科学学院,广西桂林541006

出　　处：《矿产与地质》2019年第4期591-598,共8页Mineral Resources and Geology

基　　金：国家科技支撑计划项目“新疆南部三地州优势矿产预测评价关键技术研究”（编号：2015BAB05B00）;中国地质调查局矿产资源调查项目（编号：基〔2010〕矿评03-04-01）;西藏霞钰矿业开发有限公司找矿项目共同资助

摘　　要：西藏达龙钨钼多金属矿区地处西藏拉萨市墨竹工卡县境内,位于著名的冈底斯成矿带东段的北侧,为矽卡岩型钨钼多金属矿床。对在矿区地表、钻孔及坑道采自地层、岩体、岩脉、蚀变岩、石英脉和矿体的247件样品进行了分析。微量元素含量特征及元素分布型式显示,W、Mo、Mn、Sn、Au元素质量分数高,变异系数大,表明这些元素参与了成矿作用。矿区成矿作用可划分为五个阶段,F2因子(Mn、Sn)和F5因子(Mo、W)代表了主要成矿热液活动阶段的元素组合;F3因子(Ag、Cu)、F4因子(Zn、Pb)及F7因子(Au),反映了成矿热液的多次叠加。稀土元素特征研究表明,花岗斑岩体与矿化关系密切,为成矿提供了物质来源。矿床地质地球化学特征显示其深部很可能存在斑岩型(钨)钼矿床,成矿前景和资源潜力巨大。Dalong W-Mo polymetallic deposit,a large skarn-hydrothermal vein type deposit,is located on the north side of the eastern section of the famous Gangdese metallogenic belt.247 samples of the metamorphic rocks,granites,altered rocks,quartz vein and ores,collected from the surface,drilling holes and tunnels in Dalong mining area,are analyzed.The statistical analysis of trace element parameters and element distribution pattern shows that Cu、Pb、Zn、Au、Ag、W、Sn、Mo elements are involved in mineralization with high contents and great variation coefficients.Five metallogenic stages are identified.F2 factor(Mn,Sn)and F5 factor(Mo,W)are the element combination of the main metallogenic period,F3 factor(Ag,Cu),F4 factor(Zn,Pb)and F7 factor(Au)reflect multi-phase of metallogenic hydrothermal activities.REE feature shows that the granite porphyry bodies closely related to mineralization might have provided the ore-forming material sources.The geological and geochemical characteristics of the deposit indicate that molybdenum(W)porphyritic type deposit is possible to exist in the deep part,and metallogenic prospect and resource potential is tremendous.

关 键 词：钨钼多金属矿 微量元素 地球化学特征 冈底斯成矿带 西藏 

分 类 号：P618.67[天文地球—矿床学] P618.65[天文地球—地质学]