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时间:2019-07-09
《藏南林周盆地林子宗火山岩的时代、成因及其地质意义:锆石U-Pb年龄和Hf同位素证据》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、10000569/2007/023(02)049300ActaPetrologicaSinica岩石学报藏南林周盆地林子宗火山岩的时代、成因及其地质意义:锆石UPb年龄和Hf同位素证据11234224李皓扬锺孙霖王彦斌朱弟成杨进辉宋彪刘敦一吴福元11234224LEEHaoYang,CHUNGSunLin,WANGYanBin,ZHUDiCheng,YANGJinHui,SONGBiao,LIUDunYiandWUFuYuan1.台湾大学地质科学系,台北2.中国地质科学院地质研究所,北京1000373
2、.成都地质矿产研究所,成都6100814.中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京1000291.DepartmentofGeosciences,NationalTaiwanUniversity,Taipei,China2.InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100039,China3.ChengduInstituteofGeologyandMineralResources,Chengdu610081,Ch
3、ina4.StateKeyLaboratoryofLithosphericEvolution,InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China20061106收稿,20061218改回.LeeHY,ChungSL,WangYB,ZhuDC,YangJH,SongB,LiuDYandWuFY.2007.Age,petrogenesisandgeologicalsignificanceoftheLinzi
4、zongvolcanicsuccessionsintheLinzhoubasin,southernTibet:EvidencefromzirconUPbdatesandHfisotopes.ActaPetrologicaSinica,23(2):493-500AbstractInthisstudyadaciticbrecciaandarhyoliticignimbritewerecollectedfromthebottomlayersoftheDianzhongandNianboFormations,resp
5、ectively,intheLinzhoubasin,thetypicallocalityoftheLinzizongvolcanicsuccessions,forzirconUPbdatingandHfisotopeanalysis.Theresultsindicatethattheformereruptedat62.5±1.1Maandthelatterat56.4±1.2Ma,implyingtheLinzizongvolcanismtohavestartedrightaftertheK/Tbounda
6、ry.IgneouszirconsfromtheDianzhongandNianbosamplesyieldεHf(T)valuesof+9.0~+0.5and+11.0~+4.8,respectively,suggestinginvolvementofthedepletedmantlesourceinthemagmageneration.TheseεHf(T)valuesarecorrespondingtothoseofigneouszirconsfromthecoevalGangdesebatholith,
7、thusallowingustoinferacognateoriginrelatedtopartialmeltingofthemantlewedgeandassociatedmagmaunderplating/remelting.However,inheritedzirconswithCarboniferousagesintheDianzhongsamplehaveεHf(T)valuesfrom-0.6to-3.2andMesoproterozoicmodelages,similartothoseofinhe
8、ritedzirconsfromtheNyainqentanglhagranitoids,indicatinganinvolvementofancientcrustalmaterialsfromtheLhasaterraneinthegenerationofthesevolcanicalrocks.Basedonallaboveandregionalgeology,weinterpre
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