Structural characteristics and evolution of the South Yellow Sea Basin since Indosinian-中国期刊网

摘要 BasedontheseismicdatagatheredinpastyearsandthecorrelationbetweentheseaandlandareasoftheLowerYangtzePlatform,thestructuralcharacteristicsoftheSouthYellowSeaBasinsincetheIndosiniantectonicmovementisstudiedinthispaper.ThreestagesofstructuraldeformationcanbedistinguishedintheSouthYellowSeaBasinsincetheIndosinian.Thefirststage,LateIndosiniantoEarlyYanshanian,wasdominatedbyforelanddeformationincludingboththeupliftingandsubsidencestagesunderanintensivelycompressionalenvironment.Thesecondstage,whichiscalledtheHuangqiaoEventinthemiddleYanshanian,wasachangeforstressfieldsfromcompressiontoextension.Whileinthethirdstage(theSanduoEvent)intheLateHimalayan,thebasindevelopedadepressionintheNeogene-QuatemaryafterriftingintheLateCretaceous-Paleogene.Thelong-timeevolutioncontrolled3basinformationstagesfromaforelandbasin,thenafaultbasintoafinaldepressionbasin.Inconclusion,sincetheIndosinian,theSouthYellowSeaBasinhasexperiencedcompressionalfoldandthrust,collisionalorogen,compressionalandtensionalpulsation,strike-slip,extensionalfaultblockandinversionstructures,compressionandconvergence.TheNE,NEE,nearlyEWandNWtrendingstructuresdevelopedinthebasin.Fromwesttoeast,thestructuraltrendchangedfromNEEtonearEWtoNW.Whilefromnorthtosouth,theychangedfromNEEtonearEWwithastrong-weak-strongzoningsequence.Vertically,themarineandterrestrialfaciesbasinsshowa"seesaw"patternwithfoldandthrustintheearlystages,whichisstronginthenorthandweakinthesouthandanextensionalfaultinlaterstages,whichisstronginthenorthandweakinthesouth.Inthemarinefacies'basin,thrustdeformationismoreprevailingintheupperstructurallayerthanthatinthelowerlayer.ThetectonicmechanismintheSouthYellowSeaBasinismainlyaffectedbythecollisionbetweentheYangtzeandNorthChinaBlock,whilethestressenvironmentoflarge-scal

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Structural characteristics and evolution of the South Yellow Sea Basin since Indosinian

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Structural characteristics and evolution of the South Yellow Sea Basin since Indosinian

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