MULTISTAGE SUPERIMPOSED DEFORMATION AND THEEVOLUTION OF THE NORTHEASTERN MARGIN OF YANGTZE BLOCK-中国期刊网

摘要 MultistagesuperimposeddeformationhasbeendiscussedsystematicallybasedontheprogressofthestratigraphicsequencesofthenortheasternmarginofYangtzeBlock.Thenew-discoveredfirststagedeformationofthosesequencesoccurredfromthemiddleTriassictotheendofearlyJurassictogetherwithdevelopmentofregionalfolding,whichwasresultedfromthedeepdetachmentshearingtendingtowardNW-WNW.Thefoldsdiptoeastandfalldowntowardwest,andweresuperimposedbythemainstagefolding.Thereafter,aseriesoffoldsweredevelopedwithaxestrendingtowardnortheast.Consequentlynormalfoldsoccurredonthenormallimbswhileoverturnedfoldontheoverturnedlimbsduringthefirststagefolding.ThedetachmentorthrustwasformedfromlateJurassictoearlyCretaceous.DuetotheupliftingofDabieandtheWannanMountainsinthenorthandsouthsides,thebi-directionalthrustingbeltwasformedbygravityflowingfromtheMountainstowardthecenterofthebasinalongthenorthsideofXuanchengandsouthsideofGuichi.Thedeformationgeodynamicswasdiscussedsimplybasedonthenewlyrecognizedinformationaboutthetectonicevolution.

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MULTISTAGE SUPERIMPOSED DEFORMATION AND THEEVOLUTION OF THE NORTHEASTERN MARGIN OF YANGTZE BLOCK

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MULTISTAGE SUPERIMPOSED DEFORMATION AND THEEVOLUTION OF THE NORTHEASTERN MARGIN OF YANGTZE BLOCK

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