摘要
胡家峪铜矿床大地构造位置处于华北克拉通中部造山带南缘的中条山地区，矿床主要赋存于古元古界中条群篦子沟组含碳片岩、不纯大理岩和硅质钠长岩等岩石中，次为余家山组白云石大理岩中。对矿区内的含矿岩系进行了全岩地球化学测试分析，主量元素特征表明矿区内的含矿岩系均表现出富镁、富铝的特征；微量元素特征显示，所有样品均呈现出Nb、Ta、Ti负异常的现象，显示出与俯冲带岩浆地球化学类似的特征；稀土元素特征显示出一定程度的轻重稀土分馏，轻稀土富集，所有样品都表现出不同程度的铕负异常，表明这些含矿岩系形成于还原沉积环境中。研究认为，胡家峪铜矿床的成矿构造背景为俯冲后形成的弧后盆地；容矿岩石与国内典型热水喷流矿床相比，在地球化学特征方面有一定相似之处。因此，胡家峪铜矿床应为热水喷流沉积矿床。
Abstract
Hujiayu Copper Deposit is located in Zhongtiao Mountain , south part of central orogenic belt of the North China Craton,mainly hosted in rocks such as carbonaceous schist ,impure marbles and silica albitite in Paleo-proterozoic Erathem,Zhongtiao Group,Bizigou formation,and minor in dolomite marble in Yujiashan formation .Ac-cording to whole-rock geochemical test and analysis of ore-bearing rocks within the deposit ,characteristics of major el-ements indicate that ore-bearing rocks are all enriched with Mg and Al;characteristics of trace element show negative anomaly of Nb,Ta and Ti in all samples ,similar geochemical characteristics of magma in subduction zone;The rare-earth elements are featured by LREE/HREE fractionation ,LREE enrichment and negative Eu anomaly in all samples , showing the ore-bearing rocks formed in reduction sedimentary environment .The research show that tectonic settings of Hujiayu copper deposit genesis is back-arc basin formed after subduction;Ore-bearing rocks suggest similarities in ge-ochemical characteristics with other domestic typical exhalative sedimentary deposits ,making Hujiayu Copper Deposit regarded to be an exhalative sedimentary deposit .
基金项目
中国地质调查局地质大调查项目(1212011120152)
NETL
NSTL
维普
万方数据