南大巴山镇巴—城口段构造变形特征及构造演化的中期报告Abstract:SouthwestChinaisanimportantregionforstudyingtheformationoftheQinghai-TibetPlateauanditsrelatedtectonicprocesses.Inthisstudy,wepresentpreliminaryresultsfromasurveyoftheBa-ChengkousectionintheNandabaMountainarea,whichislocatedintheeasternmarginoftheQinghai-TibetPlateau.Thestudyareaischaracterizedbyanextensiverangeoftectonicfeatures,includingthrustfaults,strike-slipfaults,folds,anddeformationbands.FieldobservationsandseismicdataanalysissuggestthatthedeformationinthestudyareaisrelatedtotheinteractionsbetweentheHimalayanthrustbeltandtheSichuanBasin.Thepresenceofanactivethrustfaultsystemintheareasuggestsongoingtectonicactivity.OurresultsindicatethattheNandabaMountainareaisavaluablelocationforunderstandingthetectonicprocessesthathaveshapedtheQinghai-TibetPlateauandsurroundingregions.Keywords:NandabaMountain,Ba-Chengkousection,tectonics,deformation摘要：西南地区是研究青藏高原形成及其相关构造过程的重要地区。本研究报道了南大巴山区巴—城口段的初步研究结果。该研究区域具有广泛的构造特征，包括逆冲断层、走滑断层、褶皱和变形带。野外观察和地震数据分析表明，研究区域的变形与喜马拉雅逆冲带和四川盆地之间的相互作用有关。该地区存在活跃的逆冲断层系统，表明构造活动正在持续。我们的研究结果表明，南大巴山区是理解青藏高原及周边地区构造过程的重要地点。关键词：南大巴山、巴—城口段、构造、变形