滇西北羊拉铜矿床3175 m中段铜矿石和构造岩地球化学特征及地质意义  

Geochemical characteristics of copper ore and tectonite in the underground tunnel 3175 m section from Yangla copper deposit in northwest Yunnan and their geological implications

作　　者：刘月东 刘凤泽 王新富 唐果[1,3] 刘超 李波 LIU Yuedong;LIU Fengze;WANG Xinfu;TANG Guo;LIU Chao;LI Bo(Faculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Diqing Mining Co.,Ltd.,Shangri-La Yunnan 674400,China;Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co.,Ltd.,Kunming 650051,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]云南迪庆矿业开发有限责任公司,云南香格里拉674400 [3]中国有色金属工业昆明勘察设计研究院有限公司,昆明650051

出　　处：《有色金属（矿山部分）》2022年第1期56-67,共12页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金资助项目(41862007,41402072);云南省万人计划青年拔尖人才项目(YNWR-QNBJ-2018-093);昆明理工大学重点学科建设项目(14078384)。

摘　　要：羊拉铜矿床是金沙江缝合带内的典型代表性铜矿床,其矿体呈层状、似层状、脉状及透镜体状产出,且明显受断裂构造及层间破碎带控制。采用电感耦合等离子体质谱仪(ICP-MS)分析技术重点对羊拉矿床里农矿段深部3175 m中段铜矿石和断裂构造岩进行主量和微量-稀土元素组成研究。结果表明,铜矿石和各构造岩均富集CaO、Al_(2)O_(3)与TFe_(2)O_(3);羊拉矿床NW向断裂可能与铜成矿作用无关。此外,断裂构造岩微量元素R型聚类分析和因子分析表明存在5个微量元素组合:1)围岩微量元素组合(Ba、Rb、REE、Th、Li、U、Be、Ga、Cs、Cr、Ta、V、Sc、Hf、Zr、Nb);2)地质意义不明元素(Sr);3)铜矿化中温成矿元素组合(Cu、Bi、Co、Ge);4)铅锌矿化中低温成矿元素组合(Zn、Cd、Pb、Ag、In、Sn、Ni、Tl)和5)高温成矿元素组合(Mo、W);表明羊拉矿床铜形成于高中低温各热液成矿阶段的成矿温度环境。稀土元素组成特征指示铜成矿作用可能主要与NE向断裂、近EW向断裂构造活动有关,而大理岩和绢云砂质板岩对成矿作用贡献较小。上述铜矿石和构造岩地球化学特征可为下一步该矿床找矿勘查提供理论指导。The Yangla copper deposit is a representative deposit in Jinshajiang suture zone.Its ore bodies are layered,vein-like and lenticular,and obviously controlled by structures and interlayer fracture zones.In this paper,Inductively Coupled Plasma Mass Spectrometry(ICP-MS)analytical technology was used to measure the major and trace-rare earth element compositions of copper ore and tectonite in the underground tunnel 3175 m section of the Linong ore block,Yangla copper deposit.The results showed that copper ore and various tectonites were enriched in CaO,Al_(2)O_(3),and TFe_(2)O_(3).The NW-trending fault of Yangla copper deposit may not be related to the copper mineralization.Furthermore,R-type cluster analysis and factor analysis showed that there were five trace element assemblages in tectonites:1)Assemblage of trace elements in wall-rock(Ba,Rb,REE,Th,Li,U,Be,Ga,Cs,Cr,Ta,V,Sc,Hf,Zr,and Nb);2)Geologically significance unknown trace element assemblage(Sr);3)Mesothermal metallogenic trace element assemblage(Cu,Bi,Co,and Ge);4)The moderate-low temperature metallogenic trace element assemblage(Zn,Cd,Pb,Ag,In,Sn,Ni,and Tl);5)The high-temperature metallogenic trace element assemblage(Mo and W).The above findings indicated that the copper of Yangla deposit was formed in various hydrothermal mineralization stages from high-medium-low temperature environments.The composition characteristics of rare earth elements indicated that copper mineralization may be mainly related to NE-trending faults and near-EW-trending faults,while the marble and sericite slate had less contribution to the copper mineralization in the Yangla copper deposit.The above-mentioned geochemical characteristics of copper ore and tectonite can provide theoretical guidance for further mineral exploration in the Yangla copper deposit.

关 键 词：微量-稀土元素 地球化学 铜矿石 构造岩 羊拉铜矿床 

分 类 号：P61[天文地球—矿床学]