Mesozoic Deformation and Its Geological Significance in the Southern Margin of the South China Sea-中国期刊网

摘要 Thepre-EocenehistoryoftheregionaroundthepresentSouthChinaSeaisnotwellknown.Newmulti-channelseismicprofilesprovidevaluableinsightsintotheprobableMesozoichistoryofthisregion.Detailedstructuralandstratigraphicinterpretationsofthemulti-channelseismicprofiles,calibratedwithrelevantdrillinganddredgingdata,showmajorMesozoicstructuralfeatures.AstructuralrestorationwasdonetoremovetheCenozoictectonicinfluenceandcalculatetheMesozoictectoniccompressionratios.Theresultsindicatethattwogroupsofcompressivestresswithdiametricallyoppositeorientations,S（S）E–N（N）WandN（N）W–S（S）E,wereactiveduringtheMesozoic.Thecompressionratiovaluesgraduallydecreasefromnorthtosouthandfromwesttoeastineachstressorientation.Thephenomenamayberelatedtotheopeningoftheproto-SouthChinaSea（thenlocatedinsouthoftheNanshablock）andtherateatwhichtheNanshablockdriftednorthwardinthelateJurassictolateCretaceous.TheNanshablockdriftednorthwarduntilitcollidedandsuturedwiththesouthernChinamargin.TheopeningofthepresentSouthChinaSeamayberelatedtothissuturezone,whichwasatectoniczoneofweakness.

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Mesozoic Deformation and Its Geological Significance in the Southern Margin of the South China Sea

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Mesozoic Deformation and Its Geological Significance in the Southern Margin of the South China Sea

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