内蒙古边家大院铅锌银多金属矿床原生晕地球化学特征及深部找矿预测  

The primary halo characteristics of Bianjiadayuan Pb-Zn-Ag polymetallic deposit in Inner Mongolia,China and ore prediction to depth

作　　者：刘怀金[1,2] 杨永强[2] 孙引强 辛江 温海成 李浩[2] 

机构地区：[1]内蒙古有色地质矿业(集团)有限责任公司,呼和浩特010010 [2]中国地质大学(北京),北京100083 [3]核工业二四三地质大队,内蒙古赤峰024000 [4]新疆维吾尔自治区地质调查院,乌鲁木齐830011

出　　处：《地质找矿论丛》2016年第2期245-252,共8页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金项目(编号:41272110)资助

摘　　要：边家大院铅锌银多金属矿床为大兴安岭中南段新发现的一个典型的热液脉型矿床,矿体呈脉群状产出。文章通过对矿区5个钻孔岩心进行系统采样和光谱测试分析,运用格里戈良分带指数法和数理统计方法(相关分析、聚类分析、因子分析)对矿区A—A′勘探线矿脉群的原生晕特征进行了详细系统的研究。认为矿脉群原生晕分带明显,前缘晕元素为Sb、Hg、As,尾晕元素为Mo、W、Sn、Bi,近矿晕元素为Pb、Zn、Ag、Cd、Cu、Au;垂向分带序列为Sb-Co-Zn-As-Mo-W-Bi-CdPb-Hg-Sn-Ag-Cu-Ni-Au,出现了Mo、W、Bi的"反向分带"现象,具有两个阶段成矿作用;成矿元素(Pb、Zn、Ag)和前缘晕元素(Hg、As)在矿脉群下部异常值较高,且异常向深部延伸,推测矿区深部可能存在隐伏矿脉群。综合上述特征,初步建立了矿区的成矿成晕理想模型。Bianjiadayuan Pb-Zn-Ag polymetallic deposit is located in the middle-southern of the Daxing′anling,and is a newly discovered hydrothermal vein-type deposit.Ore bodies occur in vein-groups.Samples are collected systematically from 5drill holes,and spectral analysis are applied.Based on the methods of Grigoryan Zoning index and mathematical statistics（Correlation analysis,cluster analysis and factor analysis）primary halos characteristics of ore bodies in A-A′exploratory line are detailly studied.The results show front elements Sb,Hg,and As;tail elements Mo,W,Sn and Bi;proximal elements Pb,Zn,Ag,Cd,Cu and Au;vertical zoning sequence Sb→Co→Zn→As→Mo→W→Bi→Cd→Pb→Hg→Sn→Ag→Cu→Ni→Au,with reverse zoning phenomenon of Mo W and Bi,showing two stages of mineralization.Ore elements（Pb,Zn,Ag）and front elements（Hg,As）are high at the lower part of vein-groups and the high anomly extends to depth and deep blind ore bodies of vein group are predicted.According to all the characteristics above,an ideal mineralization halo model has been established preliminary and provides important evidence for deep prospecting in the mining district.

关 键 词：原生晕 深部矿产预测 边家大院 大兴安岭中南段 内蒙古 

分 类 号：P595[天文地球—地球化学] P618.4[天文地球—地质学]