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ID:39679070
大小:1.40 MB
页数:13页
时间:2019-07-09
《赣南橄榄安粗质火山岩的年代学与地球化学》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、10000569/2008/024(11)252436ActaPetrologicaSinica岩石学报赣南橄榄安粗质火山岩的年代学与地球化学1112贺振宇徐夕生王孝磊陈荣1112HEZhenYu,XUXiSheng,WANGXiaoLeiandCHENRong1南京大学地球科学系,成矿作用国家重点实验室,南京2100932南京地质矿产研究所,南京2100161StateKeyLaboratoryofMineralDepositResearch,DepartmentofEarthSciences,Nan
2、jingUniversity,Nanjing210093,China2NanjingInstituteofGeologyandMineralResources,Nanjing210016,China20080912收稿,20081029改回HeZY,XuXS,WangXLandChenR2008GeochronologyandgeochemistryofshoshoniticvolcanicsinsouthernJiangxiProvinceActaPetrologicaSinica,24(11):2524
3、-2536AbstractThereisasuiteofshoshoniticvolcanicrocksintheHuichangarea,southernJiangxiProvince,whichislocatedattheeasternpartofEWtrendingEarlyYanshanianvolcanicbeltThedominantrocktypesincludetrachybasalts,basaltictrachyandesites,trachyandesitesandtrachytesInthisw
4、ork,wepresentLAICPMSUPbzircondating,LAMCICPMSzirconHfisotopicandgeochemicalresultsfortherepresentativesamplesfromtheHuichangvolcanicsZirconUPbdatingresultsyieldancrystallizationageof~181Ma,indicatingthattheHuichangvolcanicsmayhavebeenformedatthelatestageofEar
5、lyJurassicThemagmaticzirconsfromtheHuichangvolcanicsshowalargevariationofεHf(t)valuesrangingfrom21to116Afewzircons,withagesfrom213Mato225MaandεHf(t)valuesofaround-85,maybeinheritedfromtheFuchenggranitebodyTheHuichangvolcanicsareenrichedinLREEandLILE,andhaveob
6、viousNbTadepletionsintheprimitivemantlenormalizedtraceelementpatternsItissuggestedthattheHuichangvolcanicmagmamaybeproducedbythemixingofasthenospherederivedmeltswithmagmafromenrichedlithosphericmantle,andthemagmamightexperiencedasmallamountofcrustalcontaminatio
7、nduringitsascendingSincetheHuichangvolcanicsweregeneratedduringtheperiodofintracontinentalmagmatismeventwhichsrelatedtothepaleoPacificplatesubduction,theymayrecordtheasthenospherelithospherecrustinteractionsunderintraplateextensionalregime,similartotheotherEa
8、rlyMiddleJurassicmantlederivedigneousrocksinsouthernJiangxiProvinceKeywordsEarlyJurassic;Volcanism;Shoshoniticvolcanics;ZirconUPbage;Hfisotop
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