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三江造山带兰坪盆地东缘火山岩锆石U-Pb年代学Hf-岩石学报.PDF

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10000569/2015/031(11)324768 ActaPetrologicaSinica 岩石学报 三江造山带兰坪盆地东缘火山岩锆石UPb年代学、 Hf同位素组成 1,2 1,2 1,2 3 3 3 梁明娟  杨天南  史鹏亮  薛传东 向坤 廖程 1,2 1,2 1,2 3 3 3 LIANGMingJuan ,YANGTianNan ,SHIPengLiang ,XUEChuanDong,XIANGKunandLIAOCheng 1中国地质大学地球科学与资源学院,北京 100083 2中国地质科学院地质研究所,北京 100037 3昆明理工大学国土资源工程学院,昆明 650093 1SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences,Beijing100083,China 2InstituteofGeology,CAGS,Beijing100037,China 3FacultyofLandResourceEngineering,KunmingUniversityofScienceandTechnology,Kunming650093,China 20150301收稿,20150610改回 LiangMJ,YangTN,ShiPL,XueCD,XiangKandLiaoC2015UPbgeochronology,Hfisotopesofzirconsfromthe volcanicrocksalongtheeasternmarginofLanpingbasin,SanjiangorogenicbeltActaPetrologicaSinica,31(11):3247 -3268 Abstract  SeveralvolcanicbeltsdevelopedintheSanjiangorogenicbelt,southeastofTibetanPlateauRecentlypublishednew geochronologicalandgeochemicaldatagraduallyrevealedthespatialandtemporalrelationshipamongthesebeltsHowever,thesebelts arecommonlycoveredbyMesozoictoCenozoicsedimentsoftheLanpingbasin,whichhaveledtosomeerroneoustectonic interpretationsBasementrocksexposeverywellinMisharegions,easternmarginoftheLanpingbasinThebasementconsistsoftwo tectonostratigraphicunits:anupperoneconsistingofLateTriassicfinegrainedclasticandbioclasticandalowervolcaniconeThe loweronehasathicknessofca150m,whichismadeofthreevolcanicssedimentssequencesEachsequenceiscomposedof ignimbriteandcrystallithictuffinlowerandreddishordarkshaleandlimestoneinupperLAICPMSUPbresultsofzirconfromthe volcanicrocksdemonstratedthatthevolcanismstartedatleastsince258Ma,andcontinuedto248MaInsituzirconLuHfisotopic datarevealedasignificantcontributionofmantlederivedmaterialtotheearliermagmaticrocks,whilethelatterstagemagmaticrocks seemtohavecompletelyresultedfrompartialmeltingofPr
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