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汶川地震断裂带结构特征与龙门山隆升的关系-岩石学报.PDF

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10000569/2013/029(06)204860 ActaPetrologicaSinica 岩石学报 汶川地震断裂带结构特征与龙门山隆升的关系 1 1 1 2 王焕  李海兵  司家亮 黄尧 1 1 1 2 WANGHuan,LIHaiBing ,SIJiaLiangandHUANGYao 1大陆构造与动力学国家重点实验室,中国地质科学院地质研究所,北京 100037 2江苏省地质矿产局第六地质队,连云港 222023 1StateKeyLaboratoryofContinentalTectonicsandDynamics,InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China 2No6BrigadeofJiangsuGeology&MineralResourcesBureau,Lianyungang222300,China 20130222收稿,20130518改回 WangH,LiHB,SiJLandHuangY2013TherelationshipbetweentheinternalstructureoftheWenchuanearthquake faultzoneandtheupliftoftheLongmenshanActaPetrologicaSinica,29(6):2048-2060 Abstract  The2008Wenchuanearthquake(M 79)occurredattheeasternmarginoftheTibetanPlateau,producing270kmand W 80kmlongcoseismicsurfaceruptureswithdifferentkinematicsfeatures,alongtheYingxiuBeichuanandGuanxianAnxianfaults, respectively.Faultrocksaretheproductsoffaultactivities.Thecharacteristicsoffaultrocksprovideinformationonfaultactivitiesand theirevolutionhistory.Here,wefocusontheoutcropoftheYingxiuBeichuanfaultinBajiaomiaovillage,Hongkoutownandresults fromWFSD1drillcores.Basedonfieldsurvey,Xraydiffractionanalysis,microstructureanddrillcoresanalysis,a~240mwide faultzonewasconfirmedastheYingxiuBeichuanfaultzonefromtheoutcrop,correspondingtothe~105mwidefaultzoneatdepth, asdeterminedfromtheWFSD1drillcores,whichpresentsthecharacteristicsofamultiplecoresmodel.Faultrocks,includingfault breccia,faultgougeandcataclasitewereidentifiedinboththeoutcropanddrillcores,whilepseudotachylytewasonlyvisibleatthe outcrop.ThelocationofthePrincipalSlipZoneoftheWenchuanearthquake,whichdoesnotentirelyfollowtheancientfaultzone, obliquelycrossingtheYingxiuBeichuanfaultzone,mightindicatethattheWenchuanearthquakefaultandYingxiuBeichuanfaultdo notbelongtothesamefaultsystem.Basedonfaultrocksstudies,therearefourkindsoffaultmec
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