江西武山铜矿床北矿带层状高岭土成因商榷

江西武山铜矿床是长江中下游铁、铜、金成矿带的一个重要组成部分。该矿床北矿带矿体顶板广泛分布着层状高岭土，前人认为该层状高岭土为火山岩蚀变产物，从而得出该矿床为火山成因。本次通过详细的野外地质调查和室内镜下观察，以及稀土元素分析和同位素年龄测定，认为该层状高岭土为主岩体花岗间长斑岩顺层侵入的一个岩枝蚀变的产物，因此，该矿床是在正常沉积基础之上由燕山期岩浆热液叠加改造的层控矿床。

DISCUSSION ON ORIGIN OF KAOLINITE LAYER IN NORTH ORE ZONE OF WUSHAN COPPER DEPOSIT

Wushan copper deposit is an important part of Fe, Cu and An metallogenetic belt in the middle and lower reaches of the Yangtze River. There is a kaolinite layer in north ore zone of the deposit. It has been understood for long period that the Kaolinite layer is the product of altered volcanic rocks and therefore the deposit is a volcanic deposit.Through detailed field investigation, petrography and REE geochemical study and radio isotope dating, the authors conclude that the kaolinite layer indeed is an altered stock of porphyritic granodiorite which intruded in the deposit along the strata, and the deposit is a stratabound one which formed on the basis of ordinary sedimentary formation and was superimposed and changed by Yanshan ore-bearing magma hydrothermal solution.