資源描述：
《東喜馬拉雅構(gòu)造結(jié)墨脫剪切帶特征及其區(qū)域構(gòu)造意義》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在工程資料-天天文庫。
1、東喜馬拉雅構(gòu)造結(jié)墨脫剪切帶特征及其區(qū)域構(gòu)造*意義董漢文1許志琴1＊＊李源1劉釗2DONGHanWen1，XUZhiQin1＊＊，LIYuan1andLIUZhao21．大陸構(gòu)造與動力學國家重點實驗室，中國地質(zhì)科學院地質(zhì)研究所，北京1000372．中國地質(zhì)大學，北京1000831．StateKeyLaboratoryofContinentalTectonicsandDynamics，InstituteofGeology，ChineseAcademyofGeologicalSciences，Beijing100037，China2．Ch
2、inaUniversityofGeosciences，Beijing100083，China2014－02－10收稿，2014－05－20改回．DongHW，XuZQ，LiYandLiuZ．2014．CharacteristicsoftheMedogshearzoneintheEasternHimalayanSyntaxisanditstectonicsignificance．ActaPetrologicaSinica，30(8):2229－2240AbstractTheEasternHimalayanSyntaxisisbound
3、edbytheMedogshearzoneintheeastandtheDongjiu－Milinshearzoneinthewest．ThispaperfocusesonthegeometryandkinematicsofMedogshearzone，whichcanbefurtherdividedintothreesectionsaccordingtothestructure，deformationandmetamorphicgrade:theNE－SWtrendingAniqiao－Xirangnormal－senseshea
4、rzone，theN－StrendingPangxin－DamudextralshearzoneandtheNW－SEtrendingJialasa－Gandengthrust－senseshearzone．Basedonstructuraldeformation，petrographyandthequartzEBSDfabrics，twopatternsofdeformationintheMedogshearzoneareobserved，whicharehigh－temperatureandlow－temperaturedefo
5、rmations，respectively．Thestudyshowsthathigh－temperaturedeformationismainlywithin{10－0}＜a＞slipsystem，withaccordanttemperatureof550～650℃(amphibolitefacies)．Inaddition，{10－0}＜c＞slipsystemwasalsoobservedinthenorthernandmiddleoftheMedogshearzone，whichmeansthatthedeformati
6、ontemperaturecanbeevenhigherthan650℃．Thelow－temperaturedeformationismainlywithin{10－1}＜a＞and{0001}＜a＞slipsystems，whichindicatelowertemperatureof＜550℃andgreen－schistfacies．CombiningwiththeDongjiu－Milinshearzone，itissuggestedthattheNamcheBarwametamorphicterranewasconstr
7、ainedbythetwoshearzones，thenmovednorthwardandsubducteddeeplybeneaththeLhasaterrane．KeywordsStructuraldeformation;QuartzEBSDfabrics;Medogshearzone;TheEasternHimalayanSyntaxis東喜馬拉雅構(gòu)造結(jié)東、西兩側(cè)分別為墨脫剪切帶和東久－米林剪切帶，本文以墨脫剪切帶為研究對象，從構(gòu)造變摘要形幾何學和組構(gòu)運動學方面進行詳細研究。結(jié)果表明:①剪切帶不同部位的變形性質(zhì)具有逐漸演化的特
8、征，基于產(chǎn)狀、變形性質(zhì)及變質(zhì)程度等的變化將其從南到北分為三部分:NE走向具右行兼上盤下滑性質(zhì)的阿尼橋－希讓段、近N－S向具右行走滑性質(zhì)的旁辛－達木段及N(N)W向具右行兼逆沖性質(zhì)的甘登－加拉薩段;②在墨脫剪切帶內(nèi)識別出兩類剪切變形:高
