云南东川铜矿滥泥坪矿区辉长岩-闪长岩岩体成矿特征  

Metallogenetic characteristics of gabbro-diorite rock mass of the Lanniping district of Dongchuan copper deposits,Yunnan

作　　者：柳玉龙[1] 方维萱[1] 潘含江[2] 杜玉龙[1] 姚飞[1] 

机构地区：[1]有色金属矿产地质调查中心,北京100012 [2]中国地质大学,北京100083

出　　处：《矿产与地质》2011年第2期143-147,共5页Mineral Resources and Geology

基　　金：国家科技部科技支撑项目"东川-易门铜矿山深部及外围勘查技术研究课题(2006BAB01B09)";东川危机矿山接替资源勘查项目(200553026)

摘　　要：云南东川铜矿滥泥坪矿区新勘探的219、179、139、59号剖面揭露的岩相分带明显的辉长-闪长岩体,其地球化学特征表明属于碱性玄武岩系列中的基性岩类,与峨眉山东区高钛玄武岩及同期辉绿岩(侵入相)具有相似特征,在岩浆结晶分异过程中受大陆地壳混染很弱。碱性辉长岩-闪长岩杂岩(墙)体边缘发现有铁铜金矿(化)体,其与辉长岩-闪长岩岩体具有十分密切的成因关系,矿体围岩蚀变强烈,矿石矿物在空间上呈现出一定分带现象,靠近岩体铁矿物较多,铜矿物较少,远离岩体时铁矿物骤然减少,而斑铜矿、黝铜矿含量增多。岩体平均含Cu、TFe、Au、TiO2。分别是世界玄武岩的23.1、1.1、20.6、2.1倍,表明岩浆岩体可能为成矿岩体,并与因民组铁铜矿的形成具有直接的因果关系。Gabbro-diorite rock mass are exposed recently in 219# 、179# 、139# and 59# new section of the Lanniping district of the Dongchuan copper deposits in Yunnan,which have obvious zonate phenomena.The geochemical characteristics show that it belongs to basic rock in alkaline basaltic series,and similar to east area of Emeishan basalt and synchronization diabase.They have no obvious hybridism of continental crust when magmatic crystallization differentiation.The Fe-Cu-Au ore bodies were found on the edge of gabbro-diorite rock mass.The ore bodies have more iron-mineral which is close to gabbro-diorite rock mass.The bornite and tetrahedrite increase where is away from the rock mass.In respect of ore forming element,diorite-gabbro rock mass have high concentrations of Cu(0.204 %),Fe(12.72%),Au(0.099g/t),TiO2(3.691%),which implies that the rock mass may be metallogenic rock,and have direct relationship with formation of copper-iron deposits in Yingming group.

关 键 词：辉长岩 闪长岩 成矿特征 东川铜矿 

分 类 号：P5[天文地球—地质学]