金川铜镍硫化物岩浆矿床前锋岩浆与岩浆通道  

Striker magma and magma channel in the Jinchuan copper-nickel sulfide magmatic deposit

作　　者：闫海卿[1] 王强[1] 胡彦强 吴君平[3] 贾慧敏[4] 谭雨婷[1] 

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]华东冶金地质勘查局815地质队,安徽巢湖238000 [3]安徽省地质环境监测总站,安徽合肥230001 [4]河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471000

出　　处：《中国地质》2013年第3期807-819,共13页Geology in China

基　　金：国土资源部公益性行业基金项目(201011058;200911007);深部探测专项(SinoProbe-05-01);新疆东天山-北山地区铜镍矿勘查选区研究(1212011085061);中央高校基金(CHD2011TD007)联合资助

摘　　要：金川铜镍矿床是世界第三大镍、铜硫化物岩浆矿床,长期以来备受国内外矿床地质学家的关注。金川铜镍矿床Ⅳ矿区是金川矿床的有机组成部分,由于品位低(Ni 0.71%、Cu 0.48%)并且隐伏于地下140 m以下,生产与研究工作相对滞后。由于F23断裂构造的影响,金川矿床勘查以来,研究者均将其作为Ⅱ矿区2#岩体的东延部分。最近的详查钻探工程获得了较系统的样品测试,结果显示Ⅳ矿区含矿岩体是一个具有单独演化过程的独立含矿岩体,其Ni/Cu比值远高于其他矿区各个岩体,PGE强烈亏损,并且"R"因子数值低(30),微量、稀土元素配分也显示出独立的、复杂的演化过程,岩石结构与岩相变化显著,具有典型的岩浆通道前锋岩浆的特点。文章通过对比金川矿床几个主要含矿岩体的成矿元素与PGE特征,初步确定了金川铜镍硫化物成矿岩浆通道的空间位置,指出了金川深部资源勘查的关键问题与勘查方向。The Jinchuan copper-nickel deposit is the third largest nickel, copper sulfide magmatic deposit in the world, which has aroused much attention among deposit geologists both in China and abroad. The Ⅳ mining area is an component part of the Jinchuan copper-nickel deposit, but the production and research are rather insufficient due to the low grade （Ni 0.71%, Cu 0.48%） and the great buried depth （below the depth of 140 m）. Owing to the impact of the F23 fracture structure, researchers have regarded it as the eastward extension of the No. 2 pluton of the Ⅱ mining area since the beginning of the exploration work. However, recent detailed drilling investigation has obtained systematic test samples, and the results show that the ore-bearing pluton of the Ⅳmining area is an independent ore-bearing pluton mass with its unique evolution process; its Ni / Cu ratio is by far higher than the Ni/Co ratios of other ore-related pluton; its PGE is strongly depleted, and its ＂R＂ factor value is low （30）. Trace elements and REE distribution also shows independent complex evolution, and rock structures and lithofacies change significantly, with the characteristics of a typical striker magma of magma channel. A comparison of ore-forming elements and PGE characteristics between several major ore-bearing rock masses has led to the preliminary determination of the spatial location of the magma channel in the Jinchuan copper-nickel sulfide deposit; in addition, some key problems concerning the exploration of the Jinchuan deep resources and the exploration direction are also discussed in this paper.

关 键 词：前锋岩浆 岩石化学 岩浆通道 金川Ⅳ矿区 

分 类 号：P618.41[天文地球—矿床学] P588.113[天文地球—地质学]