内蒙古武川西乌兰不浪地区早前寒武纪变质基底锆石SHRIMP定年及Hf同位素组成.pdf

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1、1000-0569／2013／029(02)-0501—16ActaPetrologicaSinica岩石学报内蒙古武川西乌兰不浪地区早前寒武纪变质基底锆石SHRIMP定年及Hf同位素组成马铭株，徐仲元张连昌董春艳董晓杰刘守偈刘敦一万渝生MAMingZhu，XUZhcIngYuan，ZHANGLianChang，DONGChunYan，DONGXiaoJie，LIUSh0uJie，LIUDunYiandWANYuSheng，1．中国地质科学院地质研究所，北京离子探针中心，北京1000372．中国地质科学院地质研究所，大陆构造与动力学国家重点实验室，北京1

2、000373．吉林大学地球科学学院，长春1300614．中国科学院地质与地球物理研究所，北京1000291．BeifingSHRIMPCentel‘，InstituteofGeology，ChineseAcademyofGeologicalSciences，Beijing100037，China2．StateKeyLaboratoryforContinentalTectonicsandDynamics，InstituteofGeology，ChineseAcademyofGeologicalSciences，Beijing100037，China3．Co

3、llegeofEarthSciences，倒inUniversity，Changchun130061，China4．InstituteofGeologyandGeophysics，ChineseAcademyofSciences，Beijing100029，China2012—10．21收稿．2013_0114改回．MaMZ，XuZY，ZhangLC，DongCY。DongXJ，LiuSJ。LiuDYandWanYS．2013．SHRIMPdatingandI-IfisotopeanalysisofzirconsfromtheEarlyPreeambri

4、anbasementintheXiUlanbulangarea。Wuchuan，InnerMongolia．ActaeetroloeicaSinica，29(2)：501-516AbstractThispaperreportsSHRIMPU—PbagesandHfisotopesofzirconsfromArcheanbasementintheXiUlanbulangarea．Wuchuan，westernNorlhChinaCraton(NCC)．Zirconsfromatrondhiemitegneisssampleshowcore—rimtextu

5、res，withmagmaticcoresandmetamorphicrims】mvingweightedmeanPb／Pbagesof2692±17Maand2528士16Ma．respectively．Hfisotopeanalyseshavebeencarriedoutonzirconsfrom9samples．MagmaticzirconsofEarlyNeoarchean(2692—2697Ma)trondhjemitegneisses(2samples)haveHf(t)，tDM1(Hf)andtD№(Hf)being4．78～8．83，26

6、46～2780Maand2632～2845Ma，respectively．CapturedzirconsofNeoarcheantwo—pyroxenegranulite(2samples)haveHf(t)，tDMl(nf)andtDM2(Hf)0f一2．30—8．62，2543～2954Maand2529～3l89Ma．Neoarcheanmeta—intrusiverocks(4samples)havemagrnaticzirconswithsHf(t)Valuesof-2．60—8．09，tDMl(Hf)agesof2529～2880Maandt

7、DM2(Hf)agesof2538～3089MAnalysesondetritalzirconsfromaPaieoproterozoickyanite—garnetfelsicgneissyielded8Hf(t)valuesrangingfrom1．52to6．59andtDM1(Hf)andtDM2(Hf)modelagesof2432～2774Maand2498～2925Ma．Combinedwithearlystudies，wedrawconclusionsasfollows：1)inthestudyarea，thereareEarlyNeoa

8、reheanrrGrockswhichunderwentstrongmetamo