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ID:57732468
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时间:2020-03-25
《柴北缘尕秀雅平东和红柳沟北镁铁-超镁铁质岩体锆石U-Pb年龄及其找矿意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第10期地质通报V01.34.No.102015年10月GE0LoGICALBULLETINOFCHINAoCt..2015柴北缘尕秀雅平东和红柳沟北镁铁一超镁铁质岩体锆石u—Pb年龄及其找矿意义周伟,夏明哲,伍学恒,杜玮,汪帮耀,夏昭德,宋艳芳。,宋忠宝ZHOUWei,XIAMingzhe,WUXueheng2,DUWei,WANGBangyao,XIAZhaode,SONGYanfang,SONGZhongbao1.长安大学地球科学与资源学院,陕西西安710054;2.湖南省地质矿产勘
2、查开发局四一七队,湖南衡阳421001;3.湖南工学院,湖南衡阳421002;4.中国地质调查局西安地质调查中心,陕西西安7100541.CollegeofEarthScienceandResources,Chang’anUniversity,Xi’。n710054,Shaanxi,China;2.No.417GeologicalProspectingParty,HunanBureauofGeologyandMineralExploration,Hengyang421001,Hunan,China
3、;3.HunanInstituteofTechnology,Hengyang421002,Hunan,China;4.Xi"anCenterofGeologicalSurveNChinaGeologicalSurvey,Xi"an710054,Shaanxi,China摘要:位于柴达木地块北缘构造带内欧龙布鲁克微陆块东缘的2个镁铁一超镁铁质岩体——含Cu—Ni的尕秀雅平东岩体和含Ti—Fe的红柳沟北岩体,前者的LA—ICP—MS锆石u—Pb年龄为408.0+1.5Ma,属早泥盆世;后者的SHRIM
4、P锆石u—Pb年龄为418.3+2.8Ma,属晚志留世。区域地质资料研究表明,东昆仑地区、柴北缘在晚志留世一晚泥盆世处于后造山伸展阶段,尕秀雅平东岩体和红柳沟北岩体正是拉张环境下幔源岩浆活动的产物。在东昆仑地区、柴北缘发现的铜镍矿床和铜镍矿点(除夏日哈木有争议外)基本都形成于晚志留世一晚泥盆世。结合区域成矿年代学研究,认为晚志留世一晚泥盆世期间,东昆仑造山带和祁连造山带之间的柴达木地块、欧龙布鲁克微陆块,以及位于这两大造山带内部的微型古陆块区,是形成岩浆铜镍硫化物矿床和钛铁氧化物矿床的有利环境。关
5、键词:镁铁一超镁铁质岩体;LA—ICP—MS;SHRIMP;锆石u—Pb年龄;构造环境;柴达木盆地北缘;岩浆矿床中图分类号:P597+.3文献标志码:A文章编号:1671-2552(2015)10-1860-09ZhouW,XiaMZ,WuXH,DuW,WangBY,XiaZD,SongYF,SongZB.U—PbdatingofzirconsfromGaxiuyapingdongandHongliugoubeimafic—ultramaficintrusionsonthenorthernmarg
6、inofQaidamBasinanditsgeologicalandprospectingsignificance.GeologicalBuUe~nofChina,2015,34(10):1860—1868Abstract:ThispaperreportstWOmarie——ultramaficintrusionsintheOulongbuluckmicroblockonthenorthernmarginofQaidamBasin.OneisCu—Ni—bearingGaxiuyapingdong
7、intrusionwithLA—ICP—MSzirconU—Pbageof408.0±1.5MabelongingtoEarlyDevonian;theotherisTi—Fe—bearingHonghugoubeiintrusionwithSHRIMPzirconU—Pbageof418.3±2.8MabelongingtOLateSilurian.RegionNgeologicaldatashowthatEastemKunlunandNorthQaidamshouldbeinapost—oro
8、genicextensionenviron-mentduringtheLateSilurian—LateDevonianperiod.GaxiuyapingdongintrusionandHongliugoubeiintrusionwereproducedbymantle—derivedmagmasinanextensionalenvironment.Thecopper—nickeldepositsandorespotssuchasNiubiziliang,Binggounan,a
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