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1、第17卷第5期地学前缘(中国地质大学(北京);北京大学)Vol.17No.52010年9月EarthScienceFrontiers(ChinaUniversityofGeosciences(Beijing);PekingUniversity)Sep.2010龙门山多层分层拆离地壳结构:新构造变形与深部构造证据1,2324颜丹平,李书兵,曹文涛,张维宸11地质过程与矿产资源国家重点实验室;岩石圈构造、深部过程及探测技术教育部重点实验室,北京10008321中国地质大学(北京)地球科学与资源学院,北京10008331中国石油化工股份有限公司西南油气分公司勘探开发研究院,四川成都
2、61008141中国国土资源经济研究院,北京1011491,2324YanDanping,LiShubing,CaoWentao,ZhangWeichen11StateKeyLaboratoryofGeologicalProcessesandMineralResources;KeyLaboratoryofLithosphericTectonicsandLithoprobingTechnologyofMinistryofEducation,Beijing100083,China21SchoolofEarthSciencesandResources,ChinaUniversity
3、ofGeosciences(Beijing),Beijing100083,China31ExplorationandDevelopmentInstitute,SouthwestOilandGasBranch,ChinaPetroleum&ChemicalCorporation,Chengdu610081,China41ChineseAcademyofLandandResourceEconomics,Beijing101149,ChinaYanDanping,LiShubing,CaoWentao,etal.Mult-ilayerdetachmentcrustalstructu
4、reintheLongmenMountains:Evidencesfromneo-tectonicdeformationandgeophysicaldata.EarthScienceFrontiers,2010,17(5):106-116Abstract:Thecrustalstructureanditsaffinitywiththeoccurrenceof5.12WenchuanearthquakeintheLong-menMountainshavebecomethefocusofattentioninthefieldofstructuralgeologysince2008
5、.However,presenttectonicmodelsforinterpretingcrustalstructureintheLongmenMountainsonlyfocusonsurfacestructure,oronlypayattentiontodeepstructure;andthus,theycouldnotfurnishacomprehensiveunder-standing.ThispaperreportsacomprehensivestructuralsectionacrossthePengguancomplexandXuelongbaopluton,
6、whicharethemajortectono-petrologicalunitsgeneratingthe5.12Wenchuanearthquake,andre-inter-pretsthegeophysicaldatapublishedbypreviousstudies.Weconcludethatadetachmentfaultatadepthof~10kmseparatedthein-sequencedupleximbricatedthrustintheshallowtectoniclevel,whiletherigidbase-mentoftheYangtzeBl
7、ocknorthwestwardwedgedintothemiddletolowercrustalductilechannel,whichpro-ducedmult-ilayerdetachmentcrustalstructure.Theupperlayeroftheductilechannelflowpushedandrup-turedthePengguancomplexandXuelongbaopluton,whichresultedintheoccurrenceof5.12Wenchuaneart
