四川拉拉铁氧化物铜金矿床(IOCG)形成的矿相学证据  

Lala Iron Oxide-Copper-Gold Deposit in Sichuan Province:Evidences from Mineralography

作　　者：朱志敏[1,2] 曾令熙[2] 周家云[2] 罗丽萍[1] 陈家彪[2] 沈冰[2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [2]中国地质科学院矿产综合利用研究所,成都610041

出　　处：《高校地质学报》2009年第4期485-495,共11页Geological Journal of China Universities

基　　金：科技部国际科技合作项目(2005DFA20063);中国地质调查局地调项目(1212010781004)资助

摘　　要：四川拉拉铜矿是我国西南重要的大型铜矿,并且共(伴)生丰富的金—钼—钴—稀土—铁可供综合利用。系统的矿相学研究表明,矿石矿物主要为热液磁铁矿、黄铜矿、黄铁矿、白铁矿和辉钼矿;矿床围岩蚀变种类较多,主要有黑云母化、硅化、碳酸盐化、钠长石化、钾长石化、磷灰石化、阳起石化、萤石化等;矿石结构包括自形-半自形-它形晶粒结构、交代残余结构、包含结构和枝状结构,矿石构造包括浸染状构造、条带状构造、脉状-网脉状构造和角砾状构造;载铜矿物主要为黄铜矿,钴主要赋存于黄铁矿和白铁矿中,钼赋存于辉钼矿中,金主要以自然金或含银自然金形式赋存于黄铜矿、黄铁矿和叶碲铋矿中;磁铁矿中钛含量低,矿石中硫含量低,罕见铅锌硫化物矿物。因此,拉拉铜矿应属于典型的铁氧化物铜金矿床。The Lala copper deposit of Sichuan is one of the important large deposits in SW China not only for Cu, hut also for considerable economic amount of Au-Mo-Co-REE-Fe. Systematic ore mineralogy research shows that ore minerals are mainly composed of hydrothermal magnetite, chalcopyrite and molybdenite. The wall-rock alterations include biotitization, silicification, carbonatization, albitization, potash feldspathization, apatitization, actinolitization, fluoritization, etc. The ores have euhedral-subhedral-allotriomorphic crystalline grained texture, metasomatic relict texture, poikilitic texture, and dendritic texture, and have disseminated, banded, vein-stockwork and breccia structures. Copper is mainly found in chalcopyrite, cobalt mainly in pyrite and marcasite, molybdenum mainly in molybdenite and gold mainly in chalcopyrite, pyrite and pilsenite as native or silverbering native gold. The contents of Ti in magnetite and S in ore are low, with a very small amount of Pb-Zn sulfide minerals. Consequently, the Lala copper deposit is a typical iron oxide-Cu-Au （IOCG） deposit.

关 键 词：矿石矿物 矿床成因 铁氧化物铜金矿 拉拉铜矿 

分 类 号：P618.41[天文地球—矿床学]