DEEP TECTONOTHERMAL MECHANISM FOR THE TECTONIC EXTENSION OF THE EASTERN ASIAN CONTINENTAL MARGIN-中国期刊网

摘要 ThecontinentalmarginalextensionconceptdevelopedbyChinesegeologistsrecentlymaybeappliedtotheexplanationabouttheCenozoicextensionanddivergentmovementoftheEasternAsiancontinentalmargin.Fromtheviewpointofcontinentalmarginalextension,thispaperdiscussesthedeeptectonothermalmechanismofthetectonicextensionoftheEasternAsiancontinentalmargin.TheEasternAsiancontinentalmarginisanextensionalbeltwithintensivemagmatismandstructuraldeformation,geophysicallycharacterizedbycontinualearthquakesandobviousgeothermalanomaly.SeismictomographicalresultsabouttheEasternAsiancontinentalmarginimplythatthePacificPlateissubductedtowardtheEurasianPlateatalowangleandthedivingPacificPlateliesonthesurfaceofthe670-kmphasetransitionalzone.Weinterpretthisfeaturetoberesultedfromretrogressivesubductionfollowedbycontinentalmarginalextension.Ourthermalmodelingandgeodynamicalcomputationresultssuggestthattheretrogressivesubductionoccurredatabout76Maandthewithdrawalofthetrenchservedtosupplythevolumeforthecontinentalgrowth,whichledtotheformationofthegrowingfrontoftheEasternAsiancontinentalmargin.ThegrowthwidthoftheEasternAsiancontinentalmarginisabout700km.

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DEEP TECTONOTHERMAL MECHANISM FOR THE TECTONIC EXTENSION OF THE EASTERN ASIAN CONTINENTAL MARGIN

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DEEP TECTONOTHERMAL MECHANISM FOR THE TECTONIC EXTENSION OF THE EASTERN ASIAN CONTINENTAL MARGIN

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