江西武山铜矿稀土元素特征

武山铜矿是由两件类型的铜矿体组成,即产于上石炭统黄龙组底部的碎屑岩与碳酸盐岩之间的层状含铜黄铁矿矿体和产于花岗闪长班岩内外接触带的矽卡岩型铜矿体。稀土元素组成特征研究结果表明,上述两种类型矿体的矿石和矿石矿物在稀土元素组成持征上具有明显区别．这为探讨武山铜矿的成因提供了一个方面的信息。

THE CHARACTERISTICS OF REE IN WUSHAN COPPER DEPOSITS, JIANGXI

Wushan copper deposits consist of two genetic types of orebodies- One is the stratiform cuprifer-ous pyrite orebodies hosted in the border between bottom clastic rocks and carbonate rocks of Huang-long Group, Upper Carboniferous Series. The other is the skarn orebodies located in the contactzone of granodioritic porphyry and carbonate rocks. Up to date, there are some different opinionsabout the genesis of Wushan copper depositS, especially of the strahform cupriferous pyrite orebod-ies. The study of REE shows that there are evident differences in the REE components in ores andore minerals between the two type orebodies. The values of REE, LREE/HREE, Eu, xi, (La/Sm). and (Ce/Yb). of strati form ores are lower than those of skarn ores. The chondrife-normalizedREE petterns of the former are in the shape of "W", and have negative Eu anormalies and slightlynegative Ce anormalies. The Patterns of the latter incline to right, and have slightly positive Euanormalies. The values of ZREE, 6Eu, (La/Sm)., (La/Yb)" of ore minerals in strati form orebod-ies are lower than those of the same minerals in skarn orebodies. The former have negative Eu andCe anormalies; While the Eu anormaly of the latter is not obvious, and only part of the skarn oreminerals have slightly ne8ative Ce anormalies. The characteristics of REE give some evidence of thegenesis of Wushan copper deposits