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ID:37697097
大小:1.54 MB
页数:9页
时间:2019-05-29
《东天山白石泉镁铁_超镁铁杂岩体的Nd_Sr_Os同位素成分及其对岩浆演化的意义》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、1000-0569/2013/029(01)-0294-02ActaPetrologicaSinica岩石学报东天山白石泉镁铁-超镁铁杂岩体的Nd-Sr-Os同位素*成分及其对岩浆演化的意义1,2221陈斌贺敬博陈长健木合塔尔·扎日1,2221CHENBin,HEJingBo,CHENChangJianandMUHETAERZari1.新疆大学地质与勘查工程学院,乌鲁木齐8300462.北京大学地球与空间科学学院,北京1008711.SchoolofGeologyandExploration,Xinjia
2、ngUniversity,Urumqi830046,China2.SchoolofEarthandSpaceSciences,PekingUniversity,Beijing100871,China2012-09-08收稿,2012-11-30改回.ChenB,HeJB,ChenCJandMuhetaerZ.2013.Nd-Sr-OsisotopicdataoftheBaishiquanmafic-ultramaficcomplexfromEastTianshan,andimplicationsforpe
3、trogenesis.ActaPetrologicaSinica,29(1):294-302AbstractWereporttraceelementsandNd-Sr-OsisotopicdatafortheBaishiquanmafic-ultramaficcomplexthatoccursintheEastTianshanMountains(inthenorthernpartoftheMid-TianshanPrecambrianblock)andisaccompaniedbyCu-Nideposit
4、s,tounderstanditsmantlesourcecharacteristicsandprocessesofmantle-crustalinteraction.Geochemically,thecomplexischaracterizedbyenrichmentofLILEsanddepletionofHFSEs.Thewhole-rockSr-NdisotopiccompositionsoftheBaishiquancomplexvarysignificantly,8786with(Sr/Sr)
5、i=0.7032~0.7066andεNd(t)=5.6~-0.9,andtheNd-Srisotopicratiosarenegativelycorrelated.Thecomplex187188-12-12showsveryradiogenicOsisotopiccompositions,with(Os/Os)i=0.295~1.18andOs=80×10~29×10.Basedonthesedata,weconcludethat(1)theparentmagmaoftheBaishiquancomp
6、lexexperiencedsignificantcrustalcontaminationduringmagmaemplacement,asisrevealedbythenegativelycorrelatedandsignificantlyvariedNdandSrisotopiccompositionsandthehighlyradiogenicOsisotopiccompositions.ThisisdifferentfromapopularmodelthattheBaishiquancomplex
7、receivednocrustalcontaminationduringmagmaascent;(2)theparentmagmaoftheBaishiquancomplexoriginatedfromajuvenilelithosphericmantlethatwaspreviouslymetasomatizedbysubductionzonefluids/meltsinthePaleozoic.Thisrequiresreconsiderationofthenatureanddistributiono
8、ftheMid-TianshanPrecambrianblock.KeywordsNd-Sr-Osisotopes;Mafic-ultramaficrocks;Crustalcontamination;EastTianshan摘要本文报道东天山有铜镍硫化物矿化的白石泉镁铁-超镁铁杂岩体(分布在中天山地块北部)的微量元素和Nd-Sr-Os同位素成分,以探讨其地幔源区性质和壳幔相互作用过程。白石泉杂岩体的地球化学特征是富集大离子亲
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