辽宁桓仁二棚甸子铜锌矿床地球化学特征及矿床成因

为确定二棚甸子铜锌矿床的成因，对该矿床的成矿地质背景和地球化学特征进行了研究。结果表明，矿区内的含矿矽卡岩分为层状和不规则状两种类型，前者主要呈层状、似层状，与围岩整合接触; 含矿矽卡岩与寒武系徐庄组碳酸盐岩具有相似的稀土元素组成和一致的稀土配分曲线; 矿区地层中碳酸盐岩的Cu、Pb、Zn 等主要成矿元素含量明显高于克拉克值以及区域同类岩石的平均含量。结合S、Pb、C 等同位素资料，认为该矿床的层状矽卡岩矿体具有层控特征，成矿物质主要来自徐庄组沉积地层; 与燕山期闪长岩有关的接触交代型矿化形成了不规则状矽卡岩矿体，并对早期层状矿体进行了叠加改造。

Geochemical characteristics and ore genesis of Erpengdianzi copper-zinc deposit in Huanren area,Liaoning

To determine the ore genesis of the Erpengdianzi copper-zinc deposit in Huanren area of Liaoning, geologic and geochemical characteristics and ore-forming material source have been studied. The results showed that major skarn orebodies in this deposit occurred in stratified and irregular types. The stratified skarn were concordant with their wall-rock, and in layered or layered-like shapes. The ore-hosting skarn and the limestone in Cambrian Xuzhuang Formation had similar REE composition and distribution patterns. In addition, the contents of ore-form- ing elements of Cu, Pb and Zn in the limestone from the Xuzhuang Formation were obviously higher than their Clarke value and similar rocks in this region. These data mentioned above, together with the data of C, S and Pb isotopes, indicated that the Erpiengdianzi deposit had stratabound characteristics, and the ore-forming materials mainly came from the sedimentary strata in the Xuzhuang Formation. The irregular skarn was formed by the contact metasomatic mineralization associated with Yanshanian diorite, which superimposed and reformed the early stage.