新疆东准噶尔苏海图地区首次发现自然铜的启示和意义  

The Insight of the First Discovery of Native Copper in Suhaitu,Eastern Junggar Area,Xinjiang

作　　者：王建中[1,2] 钱壮志[2] 姜超[2] 高萍 

机构地区：[1]中国人民武装警察部队黄金第五支队,陕西西安710100 [2]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [3]西北有色地质勘查局物化探总队,陕西西安710068

出　　处：《新疆地质》2015年第1期61-67,共7页Xinjiang Geology

基　　金：长安大学中央高校基本科研业务费专项资金(CHD2011SY014)资助

摘　　要：苏海图火山岩属于纸房-琼河坝火山岩带,出露的地层主要有泥盆—二叠系火山岩。首次在新疆苏海图地区蚀变玄武岩中发现自然铜矿化,矿化与绿帘石化、碳酸盐化、孔雀石化、硅化等关系密切,显示热液成矿特点。电子探针研究初步表明,铜矿物组合为自然铜、赤铜矿和黑铜矿等,自然铜被赤铜矿、黑铜矿不同程度交代;已发现的铜矿物中,尚未发现自然铜与其它铜的硫化物之间存在接触关系,暗示自然铜为原生铜矿物,矿化与火山间歇期热液活动有关,属于火山岩型铜矿化。地球化学特征表明,苏海图含矿玄武岩不具有地幔柱玄武岩特征,自然铜矿化和地幔柱岩浆作用无关。同一岛弧带上的琼河坝地区以斑岩型、矽卡岩型铜矿为主,苏海图地区火山岩广泛分布,可能存在多种铜矿化类型,自然铜矿化是该地区一种新的矿化类型,对寻找铜矿具有一定的指导意义。Suhaitu volcanic rocks belong to the Zhifang-Qiongheba volcanic rock belt,and mainly have Devonian-Permian volcanic rocks.The native copper mineralization,a new copper mineralization type,was found for the first time in alterated Suhaitu formation basalts of Suhaitu area,Xinjiang,The mineralization is closely related to the hydrothermal mineralization such as epidotization, carbonation,and silicification Preliminary EPMA studies show that copper mineral association is the native copper,cuprite,tenorite and malachite,the native copper was alterated by the cuprite and tenorite to some extent and not connected with the other copper sulfides,all these mentioned above hint that it is associated with the volcanic hydrothermal activity and belongs to the volcanic rock type.The geochemical characters suggest that there was no connection between the basalt copper bearing mineralization with the mantle plume,so the native copper is not related to the mantle plume magmatism.The Suhaitu area widespreaded by the volcanic and sub-volcanic rocks shares the same island arc with the neighboring Qiongheba region,which is dominanted by the porphyry and skarn copper deposits.There may be a variety of copper mineralization types in Suhaitu area,and it is expected that new breakthrough can be made in further copper prospecting.

关 键 词：新疆 东准噶尔 自然铜 地幔柱 苏海图 

分 类 号：P618.41[天文地球—矿床学]