.青藏高原西北缘晚新生代沉积岩古流向的磁化率各向异性确定及其构造意义.pdfVIP

1000~569／2008／024(071．1613—20 ActaPetrologicaSinica 岩石学报 青藏高原西北缘晚新生代沉积岩古流 向的磁化率 各向异性确定及其构造意义 裴军令 孙知明 李海兵 司家亮 潘家伟 刘静 刘雪刚 赵越 PEIJunLing，SUNZhiMing。LIHaiBing，SIJiaLiang，PANJiaWei，LIUJing，删 XueGangandZHA0Yue ， 1．中国地质科学院地质力学研究所，国土资源部新构造运动与地质灾害实验室，北京 100081 2 中国地质科学院地质研究所，国土资源部大陆动力学实验室，北京 100037 3．武警黄金第八支队，乌鲁木齐 830057 1．KeyLaborator)ofNeotectonicMovementandGeologicalHazardoftheMinistryofLandandResources，InstituteofGeomechancis，ChineseAcademyof GeologicalSciences，Bering100081，China 2．KeyLaboratoryofContinentalDynamicsoftheMinistryofLandandResources，InstituteofGeology，ChineseAcademyofGeologcialSciences， Belting100081，China 3．No．8GoldGeologicalPart)ofChinesePeoplesArmedPoliceForce，Urumchi830057，China 2008-03—14收稿 ．2008-06．22改 回． PeiJL，SunZM ，LiHB。SiJL，PanJW ，LiuJ，LiuXG andZhaoY．2008．PaleocurrentdirectionoftheLateCenozoic sedimentarysequence of the Tibeatn plateau northwestern margin constrained by AMS and its tectonic implications． ActaPetrologicaSinica，24(7)：1613—1620 Abstract ThedeterminationofpaleocurrentdirectionsiSarobustapproachtoestablishthesedimentstransportandofthedeposition progress．ThecredibilityoftheAnisotropyofMagneticSusceptibility(AMS)asapaleocurrentindicatorhasbeenknownfromworkon naturallyandlaboratorydepositedsediments．Thestudyof80samplesmagneticfabrichasbeendevelopedfortheLateCenozoicstrata includingWuqia，A’tushiandXiyuFormations，KekeyasectionoftheTibetanplateaunorthwesternmargin．Flinn—type(FversusL) andP’Tplotsofthesamplesveryclearly indicatethatallthesampleshaveoblateellipsoids．suggestingtheirprimary depositional nature．The samplesrfom Wuqia，A’tushiand Xivu Formations，Kekeya section have been measured，providing AMS data and paleocurrentdirections information． The transferofpaleocurrent directions may offervaluable information aboutuplift of the northeastern TibetanPlateauduringtheLateCenozoic．ThedramaticchangesinpaleocurrentdirectionsbetweenWuqiaandA’tushi， A’tushiandXiyuFormationsimplyth