新疆萨热克砂砾岩型铜矿床钻孔原生地球化学异常特征

发布时间：2018-05-26 21:02

本文选题：原生地球化学异常 + 成矿成晕　；参考：《矿物学报》2017年05期

【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。
[Abstract]:The Sajek copper polymetallic deposit in Xinjiang is a sandboulite type copper deposit discovered in recent years. By means of correlation analysis, cluster analysis, factor analysis and other mathematical geological methods, the primary geochemical anomalies of boreholes are studied, and the characteristics of metallogenic element assemblage and vertical ore-forming halo are studied. Furthermore, the mechanism of ore-forming halo of gravel-type copper polymetallic deposits is discussed. It is considered that the ore-forming element Mo-Ag has a good correlation with Cu, and can be used as the characteristic indicator element of the gravel-type copper polymetallic deposit, and that the hydrothermal solution during the metallogenic period is mainly medium-low temperature hydrothermal solution, which may have high temperature hydrothermal solution. The ore-forming environment is sedimentary diagenetic type, and Fe is involved in the ore-forming halo of sandboulite type copper deposit, and the element Cu _ Pb-Zn mainly occurs in the form of sulphide, and diabase may carry a large amount of ore-forming halo material. The enrichment of ore-forming elements may have undergone a complicated late superposition transformation process: Cu-Mo-Ag is a combination of ore-forming elements of gravel-type copper bodies and Sb-As-Pb is a assemblage of ore-forming elements of sandstone-type lead ore-bodies. Zn-Cd-Hg is a assemblage of ore-forming elements of grit type zinc ore bodies. In this area, the enrichment is strong, The main ore-forming elements and associated indicator elements are the main ore-forming elements in this area, the vertical zoning characteristics of the primary anomalies in borehole are B-K-Cl type for upper elements and Ag-Cu-Mo-Sr-As-Sb-Pb-Au-Zn-Hg-Cd type for metallogenic elements. The lower element assemblage may be W, which is characterized by obvious hydrothermal superposition metallogenic element assemblage. It is inferred that there are many metallogenic stages in the deposit, and blind orebodies may exist in the deep part of the deposit.
【作者单位】：昆明理工大学国土资源工程学院;有色金属矿产地质调查中心;
【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)*
【分类号】：P618.41

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