本文概述了阿尔金北缘断裂带东北段(甘肃境内)的地质背景和新构造运动,讨论了断层特性、断层几何学、形变图象及一些特殊走滑运动地貌等问题。根据第四纪后期不同时代的地貌单元被水平左旋错移的幅度,结合C~(14)年代测定,求出5个不同时代至今的平均滑动速率,并分析了断层活动的一些时空特点。文章还探讨了古地震现象,现代地震活动与断裂的关系及地震危险性,较详细地研究了新发现的芦草沟古地震形变带。 This paper presents an overview of the geological background and neotectonic movement in the northeastern segment of the northern margin of the Altun fault (in Gansu Province), and discusses such issues as fault features, fault geometry, deformation images and some special strike-slip landforms. According to the amplitude of horizontal left-handed misalignment and the C ~ (14) dating, the average sliding velocities of five different epochs since the late Quaternary were calculated, and some of the spatio-temporal features of the fault activity were analyzed. The article also discusses the paleoearthquake phenomenon, the relationship between modern seismic activity and fault and the earthquake risk, and studies the newly discovered Lucaogou paleoseismic deformation zone in more detail.