新疆萨热克砂砾岩型铜矿床钻孔原生地球化学异常特征  

Mineralize-Halo-Forming Mechanism for Sareke Copper Deposit in the Xinjiang Uygur Autonomous Region, China

作　　者：俞望杰 方维萱[1,2] 贾润幸[2] 王磊[2] 鲁佳[1,2] YU Wang-jie;FANG Wei-xuan;JIA Run-xing;WANG Lei;LU Jia(Kunming University of Science and Technology, Kunming 650093, China;China Non-Ferrous Metals Resource Geological Survey, Beijing 100012, 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,北京100012

出　　处：《矿物学报》2017年第5期559-567,共9页Acta Mineralogica Sinica

基　　金：行业公益性科研专项(编号:201511016-1);中国地质调查局地质大调查项目(编号:12120114081501)*

摘　　要：新疆萨热克铜多金属矿床为近年来发现的砂砾岩型铜矿床。应用相关分析、聚类分析、因子分析等数学地质方法,对钻孔原生地球化学异常进行了研究,研究了成矿元素组合和垂向成矿成晕分带特征,进而对砂砾岩型铜多金属矿床的成矿成晕机理进行探讨。研究认为,成矿元素Mo、Ag与Cu表现出良好的相关性,可作为砂砾岩型铜多金属矿床的特征指示元素;成矿期热液主要以中-低温热液为主,可能存在高温热液,成矿环境为沉积成岩型,同时Fe参与了砂砾岩型铜矿床的成矿成晕作用;元素Cu、Pb、Zn主要以硫化物的形式赋存,辉绿岩可能携带了大量成矿成晕物质,成矿元素富集可能经历了复杂的后期叠加改造作用;Cu-Mo-Ag为砂砾岩型铜矿体成矿元素组合,Sb-As-Pb为砂砾岩型铅矿体成矿元素组合,Zn-Cd-Hg为砂砾岩型锌矿体成矿元素组合。Ag、Cu、Pb、Zn、Mo、As、Hg、Cd、Sb元素在该区富集性强,具强分异作用,显示较强的后期改造作用,是该区的主成矿元素和伴生指示元素;钻孔原生异常垂直分带特征为上部元素组合为B-K-Cl型,成矿元素组合为Ag-Cu-Mo-Sr-As-Sb-Pb-Au-Zn-Hg-Cd型;下部元素组合可能为W,为具有显著热液叠加成矿元素组合特征,推测矿床存在多个成矿期次,深部可能存在盲矿体。Sareke copper deposit has been found as a glutenite-type copper deposit in recent years. The methods of correlation analysis, clustering analysis and factor analysis were applied for investigation and research on primary halos geochemical of drilling, ore-forming elements association and vertical zoning characteristics of mineralize-halo-forming, and discussion of mineralize-halo-forming mechanism for glutenite-type copper deposit. Results show that, ore-forming element Cu has important relation with Mo and Ag, so they can be the direct instructions characteristic elements for glutenite-type copper deposit. Ore-forming hydrotherm is dominated by low-middle temperature, possibly, existing high temperature hydrotherm. The ore-forming environment is sedimentary-diagenetic-type, and Fe participates mineralize- halo-forming effect for glutenite-type copper deposit. Cu, Pb, Zn elements is hosted in the form of sulphide facies; diabase may carry amounts of mineralize-halo-forming materials. The enrichment of ore-forming elements may experience the complex superimposed-transformation effect. Cu-Mo-Ag is the forming-elements-association of glutenite-type copper ore body; Sb-As-Pb is the forming-elements-association of glutenite-type lead ore body; Zn-Cd-Hg is the forming-elements-association of glutenite-type zinc ore body. The elements of Ag, Cu, Pb, Zn, Mo, As, Hg, Cd, and Sb have better enrichment and better differentiation, are the main ore-forming elements and associated ore-forming elements for glutenite-type copper deposit, and reveal the later reformation processes.Vertical zoning characteristics of drilling display that the upper elements association is B-K-C1, and the Ore-forming elements association is Ag-Cu-Mo- Sr-As-Sb-Pb-Au-Zn-Hg-Cd; the lower elements association is W, and it＇s the remarkable ore-forming elements association with hydrothermal superimposition. Speculating mineralization may have experienced multiple-stage superposition, showing that there might be blind ore-bodies in the depth of ore body,

关 键 词：原生地球化学异常 成矿成晕 相关分析 因子分析 萨热克 砂砾岩型铜矿床 

分 类 号：P618.41[天文地球—矿床学] P632[天文地球—地质学]