甘肃北山地区黑山铜镍矿化基性—超基性杂岩体SHRIMP锆石U-Pb定年及其地质意义  

Zircon SHRIMP U-Pb dating of Heishan mafic-ultramafic complex in the Beishan area of Gansu Province and its geological significance

作　　者：杨建国[1] 王磊[1] 王小红[1] 谢燮[1] 齐正广 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]甘肃金川集团矿山工程公司,甘肃金川737100

出　　处：《地质通报》2012年第2期448-454,共7页Geological Bulletin of China

基　　金：中国地质调查局地质矿产调查专项<甘肃北山营毛沱-玉石山地区铁铜多金属矿产调查>(编号:1212011085090)

摘　　要：黑山铜镍矿床位于塔里木板块东北部的北山裂谷带内,庙庙井-双鹰山深大断裂南侧,含矿基性—超基性复式杂岩体侵位于青白口系大豁落山组和寒武系双鹰山组中。矿化主要赋存于杂岩体内的橄榄岩和角闪辉长岩内。采用锆石离子探针微区原位(SHRIMP)法获得矿化角闪辉长岩中锆石的U-Pb年龄为374.6Ma±5.2Ma,表明该含矿杂岩体的侵位及矿化作用均发生于晚泥盆世。这一年龄数据的获得不仅对重新认识北山地区的地质构造演化具有重要意义,而且为北山地区开展铜镍矿找矿提出了新方向。The Heishan copper-nickel deposit is located in the rift zone of the Beishan Mountain northeast of the Tarim plate,on the southern side of Miaomiaojing-Shuangyingshan fault.The ore-bearing mafic-ultramafic complex intruded into Dahuoluoshan Formation of Qingbaikou System and Cambrian Shuangyingshan Formation.Mineralization mainly occurred in peridotite and hornblende-gabbro complex.SHRIMP U-Pb dating of zircon from the ore-bearing hornblende-gabbro body yieldes an age of 374.6 Ma±5.2Ma,which suggests that the intrusion of the ore-bearing complex and the mineralization both occurred in Late Devonian.The obtaining of this age has important significance in understanding geological evolution of Beishan Mountain area and also in indicating targets for copper-nickel ore prospecting in Beishan Mountain area.

关 键 词：黑山铜镍矿床 基性—超基性岩体 SHRIMP锆石U-PB定年 晚泥盆世 甘肃北山地区 

分 类 号：P597.3[天文地球—地球化学]