滇东北碎屑岩中金牛厂铅锌矿床成因探讨  

Discussion on Genesis of Jinniuchang Lead-Zinc Deposit in Clastic Rocks of Northeast Yunnan

作　　者：周贲 龚红胜[1,2] 程迁群 陈刚 马玲[4] 姚永盛 ZHOU Ben;GONG Hongsheng;CHENG Qianqun;CHEN Gang;MA Ling;YAO Yongsheng(School of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Southwest Geological Survey Institute of Nonferrous Metals Mineral Geological Survey Center,Kunming 650093,Yunnan,China;Team 310 of Yunnan Nonferrous Metals Geological Bureau,Dali 671000,Yunnan,China;City College,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]有色金属矿产地质调查中心西南地质调查所,云南昆明650093 [3]云南省有色地质局三一〇队,云南大理671000 [4]昆明理工大学城市学院,云南昆明650093

出　　处：《黄金科学技术》2025年第1期84-100,共17页Gold Science and Technology

基　　金：云南省教育厅科学研究基金项目“楚雄盆地南缘马龙厂Ag-Pb多金属矿床成矿机制研究”(编号:2024J0068)和“裂隙粗糙性对裂隙网络中地下水优势流形成的影响机制及模拟研究”(编号:2023J0124)联合资助。

摘　　要：川滇黔铅锌多金属成矿域内存在大量赋存于碎屑岩中的铅锌矿床(点),这些矿床(点)已成为当前找矿预测的重要目标之一,显示该区找矿潜力巨大。金牛厂铅锌矿床位于川滇黔成矿域的西南部,矿体赋存于下寒武统筇竹寺组泥质、钙质粉砂岩中,明显不同于区内其他赋存于碳酸盐岩中的铅锌矿床,其成因研究直接关系到矿床深边部找矿预测和区域铅锌成矿系统研究。通过系统采集代表性金属硫化物样品开展微量元素分析,结果表明:(1)EPMA-Mapping和ICP-MS研究表明,金牛厂铅锌矿床中方铅矿相对富集Sb、Cd、Cu和Ag元素,亏损Mn、Sn、As、Cr和Ni元素,Sn、Sb、Mn、Cu、Cd、Bi、As和Ag元素主要以类质同象形式赋存于方铅矿中;闪锌矿相对富集Cd、Cu、Ga、Ge和Sb元素,亏损Mn、Sn、As、Co、Cr和Ni元素,Sb、Mn、Ge、Ga、Cd、As和Ag元素主要以类质同象形式赋存于闪锌矿中;(2)REE特征表现为富集LREE、亏损HREE的右倾型和Eu负异常、弱Ce负异常,与昆阳群特征基本一致,指示成矿物质主要来源于褶皱基底(昆阳群);(3)矿床微量元素和赋存形式特征与该区典型会泽型(HZT)铅锌矿床类似,属于类会泽型(HZT)矿床,适宜采用大比例尺“四步式”找矿方法进行找矿预测。该研究成果为该区同类型矿床深部及外围找矿提供了新思路,也为丰富川滇黔成矿域内铅锌成矿系统研究提供了理论依据。The numerous lead-zinc deposits situated within clastic rocks of the Sichuan-Yunnan-Guizhou polymetallic mineralization domain have emerged as significant targets for contemporary mineral exploration and predictive efforts,offering substantial potential for future discoveries.The Jinniuchang lead-zinc deposit is positioned in the southwestern region of this metallogenic domain.The ore body is situated within the mudstone and calcareous sandstone of the Lower Cambrian Qiongzhusi Formation,distinguishing it markedly from other lead-zinc deposits in the region that are typically hosted in carbonate rocks.Investigating the genesis of this ore body is crucial for advancing the exploration and prediction of deep-seated deposits,as well as for enhancing the understanding of regional lead-zinc mineralization systems.This study undertakes a trace element analysis by systematically collecting representative metal sulfide samples.The findings indicate that:(1)Electron Probe Micro-Analyzer(EPMA)mapping and Inductively Coupled Plasma Mass Spectrometry(ICP-MS)analyses reveal that galena within the Jinniuchang lead-zinc deposit is relatively enriched in antimony(Sb),cadmium(Cd),copper(Cu),and silver(Ag),while it is deficient in manganese(Mn),tin(Sn),arsenic(As),chromium(Cr),and nickel(Ni).Elements such as Sn,Sb,Mn,Cu,Cd,Bi,As,and Ag predominantly occur in galena through isomorphic substitution.In contrast,sphalerite is relatively enriched in Cd,Cu,Ga,Ge,and Sb,but deficient in Mn,Sn,As,Co,Cr,and Ni.Elements including Sb,Mn,Ge,Ga,Cd,As,and Ag are primarily present in sphalerite through isomorphic substitution.(2)The rare earth element(REE)profile is marked by an enrichment of light rare earth elements(LREE)and a depletion of heavy rare earth elements(HREE),exhibiting a right-skewed distribution.Additionally,there is a negative europium(Eu)anomaly and a weak negative cerium(Ce)anomaly,which are generally consistent with the geological characteristics of the Kunyang Group.This suggests that the ore-forming materials predominantly

关 键 词：微量元素 成矿物质来源 矿床成因 金牛厂铅锌矿床 川滇黔铅锌多金属成矿域 

分 类 号：P618.4[天文地球—矿床学]