摘要:
笔者简单介绍了乔夏哈拉铜(铁)金矿床的基本成矿及其微量元素地球化学特征,指出其主矿体具有"垂向分带"及"铜、金向下同步富集"的特点,认为其容矿火山岩与中基性侵入岩脉具有基本相似的微量元素地球化学行为,铜、金矿石同其容矿火山岩相比具有相对贫K、Rb、Th、Ba,相对富W、Ni、Co、As、Sb、Zn及明显偏低的Th/Ta、La/Yb值。研究稀土元素地球化学,发现铜、金矿石具有明显不同于其容矿火山岩的强Eu富集,后期形成的地质体一般具有相对更为偏低的ΣREE值。综合分析表明,该铜(铁)金矿床为一与"层状夕卡岩"有关的火山热液型"层控"矿床。
Abstract:
In this paper, the author introduced briefly the metallogenic characters and trace element s geochemistry of Qiaoxiahala copper (iron) and gold deposit, and summarized the relevant spatial distributive feature of its main ore bodies with "vertical zonation" and"downward synchronal enrichment of Cu and Au". It was thought that its host volcanic rocks and some intermediate-basic intrusive veins have basically similar geochemical behavior of trace elements, and that the ores of Cu and Au have lower contents of K,Rb,Th and Ba,and higher contents of W,Ni,Co,As,Sb and Zn,and obviously lower ratios of Th/Ta and La/Yb than host volcanic rocks.By studying their REE geochemistry,it was discovered that the ores of Cu and Au display strong enrichment of Eu absolutely different from host volcanic rocks,and that geologic bodies formed in later period have lower contents of REE than those formed in earlier period in most cases.On the basis of systematic analyses,Qiao xiahala copper(iron)and gold depositis considered as a kind of volcanic hydrothermal type "stratabound deposit" accompanied with "stratiform skarn".
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