东天山地区铜镍矿找矿评价指标探讨  

Discussion on Cu-Ni prospecting evaluation index at eastern Tianshan

作　　者：刘欢[1] 焦建刚[1,2] 张国鹏[1] 高栋[1] 邵乐奇 

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]西部矿产资源与地质工程教育部重点实验室,西安710054

出　　处：《中国工程科学》2015年第2期106-112,共7页Strategic Study of CAE

基　　金：中国地质调查局地质大调查项目(12120114044401;1212011085061);国家自然科学基金项目(41372101);长安大学科技创新研究项目(2013G2273009)

摘　　要：岩浆铜镍硫化物矿床主要赋存在镁铁-超镁铁质岩体中,赋矿岩体规模一般较小,矿体主要赋存在岩体的下盘,形成了很多小岩体大矿床的现象。世界上镁铁-超镁铁质岩体很多,如何判定岩体深部是否具有成矿潜力一直是大家关注的焦点。本文在前人大量研究的基础上,以东天山地区为例,对比剖析了成矿与不成矿镁铁-超镁铁质岩体的地质、地球化学特征,试图从理论上判别岩体的成矿潜力。提出成矿的超镁铁质岩体一般具有明显右倾的稀土配分曲线,岩体属于多期岩浆侵入形成,岩石中含一定量的斜方辉石,造岩矿物颗粒大小具有明显变化等找矿评价指标。The magmatic Cu-Ni sulfide deposit is mainly hosted in mafic-ultramafic intru- sions which are generally small scales. The ore body is mainly hosted in the base of the intru- sion. This forms a large number of deposits which we call ＂mall intrusion forming large depos- it＂. In the world, there are many mafic-ultramafic intrusions, but how to determine the metallo- genic potential of intrusion has been concerned all the time. In this paper, based on previous studies, we take eastern Tianshan as an example, compare and analyze the geological and geo- chemical characteristics of the economic mineralized mafic-ultramafic intrusions and the uneco- nomic mineralized mafic-ultramafic intrusions, in order to distinguish the metallogenic potential from theory. The prospecting evaluation indexes are gained from this study, mineralized mafic- ultramafic intrusions are generally characteristic by right incline in Chondrite normalized REE pattern diagrams; several stages of magma intruding are important; a certain amount of orthopy- roxene is contained in the rock;the mineral ~rains are obviously different, et al.

关 键 词：铜镍硫化物矿床 找矿评价指标 东天山 

分 类 号：P612[天文地球—矿床学]