滇西百济锑铅锌多金属矿化点黄铁矿微量元素和稀土元素地球化学  

Geochemistry of Trace and Rare Earth Elements in Pyrite from the Baiji Antimony Lead Zinc Polymetallic Mineralization Site in Western Yunnan

作　　者：刘跃福 戚华文[2] 林文杰 黄文景 LIU Yuefu;QI Huawen;LIN Wenjie;HUANG Wenjing(School of Chemistry and Environmental Engineering,Hanshan Normal University,Chaozhou 521041,Guangdong,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,Guizhou,China)

机构地区：[1]韩山师范学院化学与环境工程学院,广东潮州521041 [2]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,贵州贵阳550002

出　　处：《韶关学院学报》2024年第6期51-58,共8页Journal of Shaoguan University

基　　金：国家自然科学基金项目(42202066);韩山师范学院博士启动项目(QD202206);广东省普通高校重点领域专项项目(2020ZDZX1032)。

摘　　要：利用百济锑铅锌多金属矿化点早期矿化阶段的黄铁矿稀土元素和微量元素组成,推演成矿流体性质和成矿类型.黄铁矿LREE富集、HFSE亏损、变化的Y/Ho、Nb/Ta和Zr/Hf特征,指示该阶段的成矿流体主要是富Cl的流体,并且存在少量富F的流体混入.弱的正Eu异常和弱的负Ce异常特征,指示该阶段的成矿流体属于弱氧化性流体.根据黄铁矿样品总体上具有较高的Co含量(209×10^(-6)~7 610×10^(-6),均值为2 041×10^(-6))、Ni含量(109×10^(-6)~2 550×10^(-6),均值为746×10^(-6)),Co/Ni的变化范围介于0.86~6.83(均值为2.82)之间,推测百济矿化点早阶段形成的黄铁矿-辉钼矿-石英矿物组合是岩浆热液和浅成低温热液共同作用的产物.该研究为完善区域成矿作用提供了依据.Based on the rare earth and trace element composition of pyrite in the early mineralization stage,the properties of ore-forming fluids and ore-forming types were deduced.Pyrite LREE enrichment,HFSE deficit,changing Y/Ho,Nb/Ta and Zr/Hf characteristics indicate that the ore-forming fluids at this stage are mainly Cl-richfluids,and a small amount of F-richfluids are mixed in.The weak positive Eu anomaly and the weak negative Ce anomaly indicate that the ore-formingfluid of this stage belongs to the weakly oxidizingfluid.The pyrite samples generally have a high Co content(209×10^(-6)~7610×10^(-6),with an average of 2041×10^(-6))and Ni content(109×10^(-6)~2550×10^(-6),with an average of 746×10^(-6)).The variation of Co/Ni ranges from 0.86 to 6.83(with an average value of 2.82).It is inferred that the pyrite-molybdenite-quartz mineral association formed in the early stage of Baiji mineralization point is the product of the joint action of magmatic hydrothermal solution and epithermal solution.This study provides a basis for improving regional mineralization.

关 键 词：滇西 锑铅锌多金属矿床 黄铁矿 稀土元素 微量元素 

分 类 号：P595[天文地球—地球化学]