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Deformation of Manas River Terraces and Neotectonics in Northern Front of the Tianshan Mountains

SHI Xingmin 1),2) YANG Jingchun 1) LI Youli 1) NAN Feng 1) ( 1)College of environmental sciences, Peking University, Beijing, 100871; 2)Department of Geograph,Xianyang Normal College,Xianyang,712000)  
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. F 1 active reverse fault develops in the northern limb of the Manas fold. F 2 active reverse fault situates near the core of the Manas fold. The dislocation of river terraces shows that the F 2 fault has two periods activity and the F 1 fault has four periods activity at least. =
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