Abstract: The Manas River is the largest stream across rows of active reverse fault and fold in the north margin of Tianshan Mountains. Eight terraces had developed along the Manas River. Based on the field survey, the distribution, the arched deformation and the dislocation of the river terraces have been studied. The deformation characteristics of these river terraces suggest that the piedmont anticline and the Manas fold have been uplifted at all time. The center of the upheaval migrated from south to north in the process. F₁active reverse fault develops in the northern limb of the Manas fold. F₂active reverse fault situates near the core of the Manas fold. The dislocation of river terraces shows that the F₂fault has two periods activity and the F₁fault has four periods activity at least.

Key words: Manas river, active fold, active fault, river terraces, tectonic deformation

摘要： 通过对玛纳斯河阶地的野外测量，研究了河流阶地的发育特征、拱曲变形和错断变形。阶地的变形特征表明山麓背斜带和玛纳斯背斜带一直在隆升，且隆起中心有向北迁移的趋势。阶地的错断状况表明断层F₂活动可以分为2个阶段，断层F₁的活动至少可以分为4个阶段。

关键词: 玛纳斯河, 活动褶皱, 活动断层, 阶地, 构造变形