华北克拉通中部造山带早前寒武纪变质演化历史评述.PDF

华北克拉通中部造山带早前寒武纪变质演化历史评述.PDF

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华北克拉通中部造山带早前寒武纪变质演化历史评述

10000569/2015/031(10)301244 ActaPetrologicaSinica 岩石学报 华北克拉通中部造山带早前寒武纪变质演化历史 评述 1 2 肖玲玲  刘福来 1 2 XIAOLingLing andLIUFuLai 1北京科技大学土木与环境工程学院,北京 100083 2中国地质科学院地质研究所,北京 100037 1SchoolofCivilandEnvironmentalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China 2InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China 20150701收稿,20150820改回 XiaoLLandLiuFL2015PrecambrianmetamorphichistoryofthemetamorphiccomplexesintheTransNorthChina Orogen,NorthChinaCratonActaPetrologicaSinica,31(10):3012-3044 Abstract  Onthebasisoflithologyandmetamorphicgrade,thePrecambrianbasementoftheTransNorthChinaOrogen(TNCO)is dividedintothehighgrademetamorphicterrainsandgranitegreenstonebeltsTheformerconsistoftheTaihua,Lüliang,Fuping, Hengshan,Huai’anandXuanhuacomplexes,whichunderwenthighamphibolitetogranulitefacesmetamorphismThegranite greenstonebeltsincludetheDengfeng,ZanhuangandWutaidomains,metamorphosedingreenschisttoamphibolitefaciesTheirPT estimatesshowthatthegranulitesand/orretrogradedeclogitesintheHengshan,Huai’anandXuanhuadomainsrecordthemaximum pressuresofthepeakmetamorphism,andthegranulitesintheHengshan,FupingandXuanhuacomplexesyieldthemaximum tempreturesofthepeakmetamorphismItwasfoundthatthehighpressureamphibolitesandmetapeliteswereexposedintheZanhuang andWutaimetamorphiccomplexesThebasementrocksfromtheTNCO,regardlessoftheirprotolithandmetamorphicgrade,recorda similarmetamorphichistorycharacterizedbytheprograde,peak,nearlyisothermaldecompressionandretrogressivecooling metamorphicstages,definingnearisothermaldecompressionalclockwisePTpaths,whichrelatedtocontinentalcollisioninthecentral sectionoftheNorthChinaCratonGeochronologicaldataofthecomplexesintheTNCOindicatethreegroupmetamorphicages, ~185Ga,~195Gaand~25GaTheubiquitousmetamorphicagesof~185Garetrievedbymiscellaneousmethodsthroughoutthe metamorphicdomainsoftheTNCO,representingthepeakmetamorphism

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