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1、Formationofthe1300-km-wideintracontinentalorogenandpostorogenicmagmaticprovinceinMesozoicSouthChina:Aflat-slabsubductionmodelZheng-XiangLiTectonicsSpecialResearchCentre,SchoolofEarthandGeographicalSciences,UniversityofWesternAustralia,Crawley,WA6009,Austral
2、iaXian-HuaLiKeyLaboratoryofIsotopeGeochronologyandGeochemistry,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,P.O.Box1131,Guangzhou,ChinaABSTRACTever,littleisknownregardingthecreationofWeproposeaflat-slabsubductionmodelforMesozoicSouthChinabasedo
3、nbothnewsensitivethe~1300-km-wideSouthChinafoldbeltinhigh-resolutionionmicroprobe(SHRIMP)U-Pbzircondataandasynthesisofexistingstructural,theMesozoic(Figs.1Aand2).Earlyworkersgeochronological,andsedimentaryfaciesresults.Thismodelnotonlyexplainsthedevelopmen
4、tofnoticedtheintracontinentalnatureoftheorogenabroad(~1300-km-wide)intracontinentalorogenthatmigratedfromthecoastalregionintotheanditsmigrationinlandfromthecoastalregioncontinentalinteriorbetweenca.250Maand190Ma,butcanalsoaccountforthepuzzlingchainduringth
5、eTriassic(ca.250200Ma)andlinkedofeventsthatfollowed:theformationofashallow-marinebasininthewakeofthemigratingtheorogeniceventwiththeinitiationofanforelandfold-and-thrustbelt,andthedevelopmentofoneoftheworld’slargestBasinandRange–activeplatemarginintheweste
6、rnPacific(Cuistylemagmaticprovincesaftertheorogeny.TheSouthChinarecordmayserveasanexampleofandLi,1983;Fig.1B).AlthoughHsüetal.(e.g.,themultipleeffectsofflat-slabsubduction,includingmigratingorogenesisandforelandflexure,1990)usedcontinentalcollisionswithinthes
7、ynorogenicsaggingbehindtheactiveorogen,postdelaminationlithosphericrebound,andtheSouthChinablocktoexplainthiswideorogendevelopmentofaBasinandRange–stylebroadmagmaticprovince.(Fig.1C),themodelreceivedlittlegeologicalsupport(seeChenetal.,1991,andreferencesKe
8、ywords:flat-slab,orogen,delamination,SouthChina,Indosinian,magmatism.therein).Li(1998)invokedfar-fieldstressfromthecontinentalcollisionatthenorthernmarginINTRODUCTIONEarthhistory(Murphyetal.,1999).Wereporthereo
