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1、AbstractBasedonthefieldobservationsandmicroscopeanalysis，weselectMicrostructuralanalysis,strainmeasurementsandkinematicvorticityasresearchmethods,todeterminethespatialdistribution,kinematicsandkineticsoftheZiyuan-Xinningductileshearzone.Onthebasisofthesecharacteristic
2、s,werevealthemechanismsofdeformationoftheductileshearzonesanddeformationenvironment,theestablishmentofamulti-phasetectonicdeformationevolutionaryprocess.Ziyuan-Xinningductileshearzoneisalargeshearzoneconsistingofsmalltoughnessductileshearzones,whichisaNNEtrend,NWWdipp
3、edwithlengthof100kmandwidthof10km.ThestretchinglineationsonmyloniticfoliationmainlyplungtotheSWW~SW.Thetectonicdeformationofductileshearzoneinthenorthandmiddleisrelativelystrong,withobvioustectoniczonation.Strongshearzoneconsistsofmyloniteandtectonicschist,whileweaksh
4、earzonemainlyconsistsofgneissicgranite.Judgingfromsuchshearsenseindicatorasunsymmetricalphenocrystaugens,booksynclineandS-Cfabric,theductileshearzonesinistralstrike-slipshearzone.Combinedthefinitestrain,kinematicvorticityanalysiswithmicrostructuralfeatures,werevealtha
5、tZiyuan-Xinningductileshearzonehasexperiencedatleastthreeevolution:atthefirststage,myloniticfoliationandstretchinglineationrecordabulksimple-dominatedgeneralshear;atthesecondstage,extensionalcrenulationcleavagerecordedabulkPure-dominatedgeneralshear;atthelaststage,the
6、extensionofthestretchcrenulationcleavage(C')formsalow-anglebrittledetachmentfault.Thestraintypeofmyloniteischaracterizedbycontractibilitystrain(K>1),whichreflectstheductileshearzoneformedinextensionalenvironmentwithalowtemperatureof420to500°Cduringdeformation.Andthest
7、rainrateis1.2~62.7×10-12s-1.Ziyuan-Xinningductileshearzone,aswellastheextensionalductileshearzoneoftheMotianlingandyuanbaoshanmagmarock,belongstotheYangtzeplate,formedinthelateCaledonianpost-orogenicextensionalenvironment,theformationofductileshearzoneoccurslaterthan4
8、29Ma.TheextensionaldetachmentstructurereflectsthecrustalthickeningandtheextensionalthinningtookplaceinsuccessioninNortheastG
