西秦岭糜署岭花岗岩体年代学_地球化学特征及其构造意义_李佐臣

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1、1000-0569/2013/029(08)-2617-34ActaPetrologicaSinica岩石学报西秦岭糜署岭花岗岩体年代学、地球化学特征及其*构造意义11＊＊121111李佐臣裴先治李瑞保裴磊胡波刘成军陈国超陈有炘11＊＊121111LIZuoChen，PEIXianZhi，LIＲuiBao，PEILei，HUBo，LIUChengJun，CHENGuoChaoandCHENYouXin1.西部矿产资源与地质工程教育部重点实验室，长安大学地球科学与资源学院，西安7100542.中国地质大学地球科学与资源学院，北京1000831.K

2、eyLaboratoryofWesternChina’sMineralＲesourcesandGeologicalEngineering，MinistryofEducation，FacultyofEarthScienceandＲesources，Chang’anUniversity，Xi’an710054，China2.FacultyofEarthScienceandMineralＲesources，ChinaUniversityofGeosciences，Beijing100083，China2012-07-01收稿，2013-03-03改回

3、.LiZC，PeiXZ，LiＲB，PeiL，HuB，LiuCJ，ChenGCandChenYX.2013.LA-ICP-MSzirconU-Pbdating，geochemistryoftheMishulingintrusioninwesternQinlingandtheirtectonicsignificance.ActaPetrologicaSinica，29(8):2617－2634AbstractAnEWtrendingIndosiniangranitoidebeltdistributesneartheMianlueSutureZone

4、inthesouthernmarginoftheQinlingOrogenicBelt.TheMishulingintrutionisoneoftheIndosiniangranitoidslocatedinthewesternQinglingandnorthtotheMianlueSutureZone.ThisarticlestudiestheLA-ICP-MSzirconU-PbagesandgeochemistrycharacteristicsoftheMishulingbiotitequartzmonzoniteandmonzodior

5、iteenclaves.TheresultsshowthatthecrystallizationageoftheMishulingbiotitequartzmonzoniteis214.5±1.6Ma(MSWD=0.24).TheA/CNKratiosoftheMishulingbiotitequartzmonzoniteandmonzodioriteenclavesrangefrom0.64to－6－60.97，indicatingthatthegranitoidsaremetaluminousrocks.The∑ＲEEofthegranit

6、oidesare197.3×10～246.6×10.TheＲEEpatternsshowrightwardinclineandmoderatenegativeEuanomaly.ThetraceelementgeochemistryischaracterizedevidentlybynegativeanomalyofTa，Nb，P，Ti，Ba，Sr，etc.andpositiveanomalyofＲb，U，La，Zr，Hf，Nd，Y，etc.Thehostrockbiotitequartzmonzoniteandenclavesmonzodio

7、riteareI-typegranitoids，whichmayoriginatefromasinglemagma.Themagmawasformedbypartialmeltingofbasicrocks.TheMishulingintrusionsarepost-orogenicgranitoidswhichwereformedinatransitionaltectonicsettingfromsyn-(compressionalsetting)topost-collision(extensionalsetting).Theywerepro

8、ductsformedbypartialmeltingofthickenlowercrustresultingfromthecollisionbetw