Large-Scale Dextral Strike-Slip Movement and Associated Tectonic Deformation Along the Red-River Fault Zone-中国期刊网

摘要 Fieldinvestigationhasrevealedthatthelarge-scaledextralstrike-slipmovementandtheassociatedtectonicdeformationalongtheRedRiverfaultzonehavethefollowingfeatures:geometrically,theRedRiverfaultzonecanbedividedintothreedeformationregions,namely,thenorth,centralandsouthregions.ThenorthregionliesontheeasternsideoftheNorthwestYunnanextensionaltaphrogenicbelt,whichischaracterizedbythe3setsofrift-depressionbasinsstrikingNNW,NNEandnearN-SsincethePliocenetime,andonitswesternsideistheLanping-YunlongcompressivedeformationbeltofthePaleogenetoNeogene;thedeformationinthecentralregionischaracterizedbydextralstrike-sliporshearing.TheeastYunnanMiocenecompressivedeformationbeltliesontheeasternsideofthefaultinthesouth,andtheTengtiaohetensilefaultdepressionbeltislocatedonitswest.Intermsoftectonicgeomorphology,theaforementioneddeformationisrepresentedbybasin-rangetectonicsinthenorth,linearfaultedvalley-basinsinthecentralpartandcompressive(ortensional)basinsinthesouth.Amongthem,thegreatvarianceinelevationoftheplanationsurfacesonbothsidesoftheCangshan-ErhaifaultsuggestsprominentnormalfaultingalongtheRedRiverfaultsincethePliocene.Fromtheviewpointofspatial-temporalevolution,themainactiveportionofthefaultwasthesouthernsegmentinthePaleogene-Miocene-Pliocene,whichisrepresentedby"tearing"fromsouthtonorth.ThemainactiveportionofthefaulthasmigratedtothenorthernsegmentsincethePliocene,especiallyinthelateQuaternary,whichischaracterizedbyextensionalslipfromnorthtosoutheast.ThesizeofthedeformationregionandthemagnitudeofdeformationshowthattheeasternplateoftheRedRiverfaulthasbeenanactiveplateoftherelativemovementofblocks.

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Large-Scale Dextral Strike-Slip Movement and Associated Tectonic Deformation Along the Red-River Fault Zone

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Large-Scale Dextral Strike-Slip Movement and Associated Tectonic Deformation Along the Red-River Fault Zone

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