15250.東北梨樹斷陷斷陷期構造應力場分析

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3、nalysisofTectonicStressfieldofLishuFaultDepressioninNortheastCbinaSpeciality：GeologicalEngineeringName：XuRongzhong(signature)Instructor：SongLijun(signature)ABSTRACTLishuFaultDepressionconstitutesasuperimposedonewithabrea

4、ksinkingcharacteristicdevelopingintheEarlyCretaceousEpochInthesoutheastupwellingRreaofSongfiaobasinandwithTanLufaultzonet0itseastitislocatedonthejuncturepartoftectonicdomainbetweenpacificoceanandpaleoasianoceanfromatecto

5、nicpointofviewDuetoitsuniquetectonicpositionandrichnessinpetroleumresources，LishuFaultDepressionhaslongbeenconcernedbynumerousgeologistsandresearchersHowever，throughyearsofstudying，thereisstillagreatdivergenceondivisiono

6、fitsbreakingsinkingprocessandthemechanicalpropertiesofeachphase，whichleadstovariousunderstandingsabouttheissuesandpropertiesoftectonicstressfieldofLishuFaultDepressionInordertogetindepthknowledge，thispaperbasedontheprevi

7、ousresearchfindings，furtheranalysesdifferentdynamicenvironmentsofbreakingsinkingphasesofLishnFaultDepressionbyusingequilibriumprofiletechniqueAdditionallytectonicstressfieldsofdifferentphasesalsobesimulatedthroughtheappl

8、yingANSYSFEM(FiniteElementModeling)simulationsoftwareTheresultssuggestthat：DuringhuoshilingperiodtheaverageextensionalratiosofLishnDepressiongottenfromtheequilibriumprofiletechniqueare498％、268％respectivelyinthedirections

9、ofNWSEandNESWcorrespondingtothestressfieldsimulationresultsof470％and283％TheconsistentresultsshowthatLishuDepressiondevelopedunderarightlateralstrikeslipextensionalcircumstance，whichmaybeaconsequenceofjointextrusionsfromt

10、heclosuresofNeoTheysinthesouthwestandErkutskOceaninthenorth，butagreaterforceinthesouthwest；Duringtheshaheziperiodtheaverageextensionalratiosreceivedbytheequilibriumprofiletechniqueare060％、133％in也edirectionsofNWSEandNESWi

11、naccordancewiththestressfieldsimulationresultsof060％、130％ItcanbespeculatedthatatthistimetheLishuFaultDepressiondevelopedunderaleftlateralstrikeslipcompressionalenvironment，whichmaybecausedbyextrusionfromclosureofNeoTheys

12、andnorthwestwardsubductionofthepacificplateinthenorthwest，butaweakerpressingforceinthenorthwest；Duringtheyingchengperiod，inthedirectionsofNWSEandNESWtheaverageextensionalratiosare290％、015％byusingtheequilibriumprofiletech

13、nique，showingnodifferencewiththestressfieldsimulationresultsof258％、010％ThesetwotechniquesprovethefactthatLishuDepressiondevelopedunderarightlateralstrikeslipextensionalenvironmentatthistime，whichmaybearesultofcooperative