中条山潔水杂岩的同位素年代学研究及其地质意义中条山［束水杂岩的同位素年代学研究及其地质意义收稿日期：20110415基金项目：中国地质调查局项目(1212010633903,1212010634002)作者简介：赵斌(1965),男，山西沁水人，高级工程师，工学博士研究生，从事地球物理勘查及矿产勘查研究，Emai1:sxwhyzb@gmai1o：16726561(2012)01000108中条山涼水杂岩的同位素年代学研究及其地质意义赵斌1,2,王登红3,侯可军3,刘仁亮2(1长安大学地球科学与资源学院，陕西西安710054；2山西省地球物理化学勘查院，山西运城044004；3屮国地质科学院矿产资源研究所，北京100037)摘要：中条山是中国重要的铜多金属成矿带，拥有著名的晚太古代“变斑岩型”铜矿峪大型铜矿床和元古代“层控型”胡家峪一篦子沟铜矿床，近年来又在中条山西南段的j束水朵岩中发现以变基性火山岩(斜长角闪岩)为容矿岩石的桃花洞铜矿。为了弄清楚该铜矿的形成时代及其成矿地质背景，利用电感耦合等离子质谱(LAMCTCPMS)方法对桃花洞铜矿容矿围岩一1束水杂岩中的寨子一西姚灰色片麻岩、斜长角闪岩及二长花岗岩进行了同位素年代学研究。结果表明：寨子一西姚灰色片麻岩、斜长角闪岩脉和二长花岗岩中鉛石的岩浆结品年龄分别为(2625±11)、(2592±16)、(2548±15)Ma；岩石中古老继承性错石的年龄分别为(2790±15)、(2773±24)、(2782±34)Ma；三种不同成生顺序的岩石中均有大于2700Ma的错石存在，且年龄相当接近；中条山地区沖水杂岩可能最初形成于太古代。潔水杂岩作为与成矿关系密切的容矿围岩，其成岩时代可以间接指示成矿时代，由此得出赋存在变基性火山岩层屮的古火山含矿原岩建造型铜矿有可能是中国最古老的铜矿之一。关键词：同位素年代学；电感耦合等离子质谱；链石；铜矿；太古代；容矿岩石；沖水杂岩；中条山：P588.34；P597.3文献标志码：AIsochronologystudyonSushuiComplexinZhongtiaoMountainsanditsgeologicalsignificanceZHAOBini,2,WANGDenghong3,HOUKejun3,LIURenliang2(1.SchoolofEarthSciencesandResources,ChanganUniversity,Xian710054,Shaanxi,China;2.ShanxiGeophysicsandGeochemicalProspectingTnstitute,Yuncheng044004,Shanxi,China；3.InstituteofMineralResources,ChineseAcademyofGeologicalSciences,Beijing100037,China)Abstract:ZhongtiaoMountainsaretheimportantcopperpolymetallicorebeltsinChina,producingfamouslargescaleTongkuangyucopperdepositwithmetamorphoticporphyrytypeformedinupperArchaeozoicandHujiayuBizigoucopperdepositwithstrataboundtypeformedinProterozoic・Recently,Taohuadongcopperdepositoforebearingrockhostedinmetabasicvolcanicrock(amphibolite)wasdiscoveredinSushuiComplexwhichlocatedinthesouthwesternsegmentofZhongtiaoMountains・InordertodeterminetheoreformingepochandgeologicalbackgroundforTaohuadongcopperdeposit,ZhaiziXiyaogreygneiss,amphiboliteandmonzograniteinSushuiComplex,whichwereorebearingwallrocksinTaohuadongcopperdeposit,wereusedforisotopedatingbythemethodofLAMCICPMS.Theresultsshowedthatthemagmaticcrystallizationagesofzirconswere(2625±11),(2592±16),(2548+15)Ma,respectively;theagesofolderinheritedzirconswere(2790±15),(2773±24),(2782±34)Ma,respectively;allthethreerockscrystallizedindifferenthadtheinheritedzirconswithsimilarages,whichweremorethan2700Ma;SushuiComplexinZhongtiaoMountainsmightbeinitiallyformedinArchaeozoic・ThediagenesisageofSushuiComplex,whichwastheorebearingrockrelatedwithmetallogenicassociation,couldindirectlyindicatethemineralogeneticepoch,sothattheorebearingpalaeovolcanocopperdepositwithconstructiontypehostedinmetabasicvolcanicrockcouldbeoneoftheoldestcopperdepositsinChina.Keywords:isochronology;LAMCICPMS;zircon;copperdeposit;Archaeozoic;orebearingrock;SushuiComplex;ZhongtiaoMountainso引言中条山是中国重要的铜多金属成矿带，拥有著名...