EffectsofCrustalEclogitizationonPlateSubduction/CollisionDyn

时间：2016-11-28 09:07:04 作者：PengpengHuangfu；Yue

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【摘要】：2Dthermo-mechanicalmodelsareconstructedtoinvestigatetheeffectsofoceanicandcontinentalcrustaleclogitizationonplatedynamicsatthreesuccessivestagesofoceanicsubduction,slabbreakoff,andcontinentalsubduction.Crustaleclogitizationdirectlyincreasestheaverageslabdensityandaccordinglytheslabpullforce,whichmakestheslabsubductdeeplyandsteeply.Numericalresultsdemonstratethatthedurationtimefrominitialcontinentalcollisiontoslabbreakofflargelydependsontheslabpullforce.Specifically,eclogitizationofsubductedcrustcangreatlydecreasethedurationtime,butincreasethebreakoffdepth.Thedetachmentofoceanicslabfromthepro-continentallithosphereisaccompaniedwithobviousexhumationofthesubductedcontinentalcrustandasharpupliftofthecollisionzoneinresponsetothedisappearanceofdownwarddragforceandtheinducedasthenosphericupwelling,especiallyundertheconditionofnoorincompletecrustaleclogitization.Duringcontinentalsubduction,theslabdipangleisstronglycorrelatedwitheclogitizationofsubductedcontinentallowercrust,whichregulatestheslabbuoyancynature.OurmodelresultscanprovideseveralimportantimplicationsfortheHimalayan-Tibetancollisionzone.Forexample,itispossiblethatthelateralvariationsinthedegreeofeclogitizationofthesubductedIndiancrustmighttosomeextentcontributetothelateralvariationsofsubductionanglealongtheHimalayanorogenicbelt.Moreover,theaccumulationofhighlyradiogenicsedimentsanduppercontinentalcrustalmaterialsattheactivemarginincombinationwiththestrongshearheatingduetocontinuouscontinentalsubductiontogethercauserisingofisothermsintheaccretionarywedge,whichfacilitatethedevelopmentofcrustalpartialmeltingandmetamorphism.
【论文正文预览】：0INTRODUCTIONTheslabpullisgenerallybelievedtobethedrivingmechanismforplatesubduction(e.g.,Schellart,2004;LithgowBertelloniandRichards,1995;Vignyetal.,1991;ForsythandUyeda,1975).Fromthemechanicalperspective,eclogitizationofsubdu
【文章分类号】：P542
【稿件关键词】：numericalmodelingcrustaleclogitizationoceanicsubductionslabbreakoffcontinentalsubductionHimalayan-Tibetancollisionzone
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【稿件标题】：EffectsofCrustalEclogitizationonPlateSubduction/CollisionDynamics:ImplicationsforIndia-AsiaCollision
【作者单位】：State
【发表期刊期数】：《JournalofEarthScience》2016年05期
【期刊简介】：0......更多JournalofEarthScience杂志社(http://www.400qikan.com/qk/10904/)投稿信息
【版权所有人】：PengpengHuangfu；YuejunWang；ZhonghaiLi；WeimingFan；YanZhang；