金川南延地区基性-超基性岩特征及其与矿区含矿超基性岩体的对比研究

A Comparative Study of the Characteristics of the Basic-Ultrabasic Rocks in the Southwest Region and the Ore Rocks in the Jinchuan Ni-Cu Deposit

金川南延地区出露近百处基性-超基性岩体,查清这些岩体的活动规律及其与金川含矿岩体的关系,对南延地区找矿具有十分重要的意义。本文通过显微镜鉴定、X射线粉晶衍射及岩石化学分析等方法,研究了金川南延地区的基性-超基性岩的岩石学和地球化学特征,并与金川含矿超基性岩体进行了对比分析。结果表明,南延地区出露的变辉橄岩与金川含矿岩体有类似的矿物组成、相近似的微量元素含量,以及相似的稀土配分曲线,表明它们是同源岩浆演化岩体在不同地段侵入的产物。

There are more than 100 basic-ultrabasic rocks distribute in the southern Jinchuan deposit.Understanding the activities of these rocks and their relationship with the ore-bearing intrusions is extremely significant for prospecting in the southern part.We studied the petrologic and geochemical features of the basic-ultrabasic rocks by the techniques of microscope,X-ray powder diffraction and geochemical analysis.The results showed that the josefite in the research area has the similar mineral composition,and the similar content of trace elements and the similar distribution of REE with the ore-bearing intrusions,indicating that they may evolve from a same magma activity.