阿尔金南缘塔特勒克布拉克复式花岗质岩体东段片麻状花岗岩的地球化学特征、锆石U-Pb定年及其地质意义.pdf

《阿尔金南缘塔特勒克布拉克复式花岗质岩体东段片麻状花岗岩的地球化学特征、锆石U-Pb定年及其地质意义.pdf》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、1000-0569／2013／029(09)一303948ActaPetrologicaSinica岩石学报阿尔金南缘塔特勒克布拉克复式花岗质岩体东段片麻状花岗岩的地球化学特征、锆石U．Pb定年及其地质意义康磊刘良曹玉亭王超杨文强梁莎KANGLei，LIULiang，CA0YuTing，WANGCha0，YANGWenQiangandHANGSha1．大陆动力学国家重点实验室，西北大学地质学系，西安7100692．西安地质矿产研究所，西安7100541．StateKeyLaboratoryofContinentalDynamics，DepartmentofGeology，NonhwestU

2、niversity，Xi’an710069，China2．’anInstituteofGeologyandMineralResource，Xi’an710054，China2012—10一l1收稿．2013—04-07改回．KangL，LiuL，CaoYT，WangC，YangWQandLiangS．2013．Geochemistry，zirconU-PbageanditsgeologicalsignificanceofthegneissicgranitefromtheeasternsegmentoftheTatelekebulakecompositegraniteinthesouthAl

3、tynTagh．ActaPetrologicaSinica，29(9)：3039—3048AbstractTheTatelekebulakegneissicgranite．outcroppedintheeasternsegmentoftheTatelekebulakecompositegraniteinthesouthAltynTagh，haveahigh—Kcal—alkalineandweaklyperaluminouscomposition(SiO2=71．88％～73．92％，A12O3=13．39％～14．14％，K，0+Na，O=8．18％一8．85％，K，O／Na，0=1．5

4、4～2．33，A／CNK=1．02～1．09)．andarerichedinlargeionlithophileelements(LILE)anddepletedinhighfieldstrengthelements(HFSE)withaclearnegativeNb，Ta，P，Tianomaly．REEdistributionpatternsshownegativeanomalyofEu(8Eu=0．22～0．71)，distinctenrichmentsinLREErelativetoHREE．Theelementratios．suchasNb／Ta(11．78～15．83)，Zr／H

5、f(34．94～36．82)，Th／U(8．4～12．7)，combiningdiscriminatingcompositionsofsourcerocks，indicatetherockisformedbythepartialmeltingofmetapolitic—arenaceoussedimentaryrocksfromlowercrust．Theresidualmineralassemblage(Grt+P1+Ru)whichisimpliedbythetraceandREEelementscharacteristicandthepartiallymeltingtemperatu

6、re>800℃calculatedbywholerockZrthermometer．indicatethattherockwasgeneratedbythedehydrationfromamphiboleandbiotiteundergranulitefaces．LA—ICP·MSinsituU—Pbdatingobtainsthethreegroupages：761±54Ma(upperintersectionpointage)，451±1．7Ma(core)and411．3±1．8Ma(rim)．TheaverageTh／Uratiosofcore(0．64)andrim(O．05)，

7、zirconCLimagescharacterandregionalgeologicalstructuralsetting，suggestthatthesourcerockageis782．3±6．9Ma，relatingwiththeeventofbreakupofRodinia；therockformationageis451±1．7Ma．formedinapost—orogenicenvironmentafterc