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1、第14卷第2期地学前缘(中国地质大学(北京);北京大学)Vol.14No.22007年3月EarthScienceFrontiers(ChinaUniversityofGeosciences,Beijing;PekingUniversity)Mar.2007华北东部大陆地幔橄榄岩组成、年龄与岩石圈减薄郑建平,余淳梅,路凤香,张志海,汤华云中国地质大学(武汉)地球科学学院,地质过程与矿产资源国家重点实验室,湖北武汉430074ZhengJianping,YuChunmei,LuFengxiang,ZhangZhih
2、ai,TangHuayunFacultyofEarthSciences,StateKeyLaboratoryofGeologicalProcessesandMineralResources,ChinaUniversityofGeosciences,Wuhan430074,ChinaZhengJianping,YuChunmei,LuFengxiang,etal.Ageandcompositionofcontinentalmantleperidotitesandimplicationsforthelithosphe
3、ricthinning,easternNorthChina1EarthScienceFrontiers,2007,14(2):0872097#Abstract:Olivine2Mgvaluesanddiopside2REEpatternsofmantleperidotitesfromtheNorthChinaweresys2tematicallystudied.InsituLAM2MC2ICPMSRe2OsisotopesofsulfidesintheHannuobaandHebiperidotiticxenol
4、ithsandU-PbagesofzirconsintheXinyangperidotiticxenolithsarealsoreported.Basedonthesedata,wediscussthethinningmechanismofthelithosphereduringMesozoic-CenozoictimesbeneaththeeasternNorthChinaCraton.Insituanalysishasanadvantagesoverthewhole2rockanalysisinreveali
5、ngdeepproces2sesoflithosphereindetail,andofexploringthepossibleexistenceofthermaleventsintheMesoproterozoic(114Ga)andintheNeoproterozoic(017-018Ga)beneaththedeep2seatedlithosphereoftheNorthChinaCraton.Thecoexistenceofdifferenttypesoflithosphericmantle,includi
6、ngrefractory,transitionalandfertile,cannotbewellinterpretedbythemechanismoflithosphericdelamination.Simplemelt2peridotiteinteractionisalsodifficulttointerpretthelithosphericthinningprocessesintheMesozoicandCenozoic.Thus,complexprocessessuchasextension,melt2ro
7、ckinteraction,asthenosphericerosionandmantlereplacementmusthavebeeninvolvedduringthelithosphericthinning.Theseprocessesmaybesummarisedasfollows:(1)northwardsubductionandsubsequentcollisionoftheYangtzeCratonintheearlyMesozoic,resultedintheNorthChinalithospheri
8、cmantleexperiencingmetasomatismormodification(throughmelt2rockinteraction)byfluids/meltsderivedfromthesubductedYangtzecontinent,lithosphericmantleextensionandasthenosphericerosion.(2)Asth
