Acta Geographica Sinica ›› 2012, Vol. 67 ›› Issue (5): 681-688.doi: 10.11821/xb201205010

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Gullies Evolution and Fault Activities in Dushanzi, Xinjiang

QIAN Mang, LI Youli, SI Supei, LU Shenghua, WANG Yiran   

  1. College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
  • Received:2011-12-07 Revised:2012-02-19 Online:2012-05-20 Published:2012-05-20
  • Supported by:
    National Natural Science Foundation of China, No.40971001

Abstract: Dushanzi anticline is the northwestern fold of the three fold belts in north Tianshan Mountains. A thrust fault has developed in the north limb of the fold. The fault movement caused scarps with a height of less than 20 m in the terraces and alluvial fans of Kuitun River. Gullies have developed on the upper stream alluvium of the scarp, which can be divided into 7 groups by length. Trenches revealed two latest faulting events of the north limb fault in Dushanzi anticline, the former occurred at 3110?40 a BP. The headwater erosion rate is 38 mm/a, deduced from the average length of gullies triggered by faulting. Based on the headwater erosion rate, the time of formation can be calculated for each group of gullies (1169 a BP, 3110 a BP, 7203 a BP, 12573 aBP, 14992 a BP, 30568 a BP, and 37745 a BP), which may coincide with occurrences of faulting events. The latest faulting age derived from headwater erosion rate is consistent with that discovered from trenches, and another three latest events are consistent with the previous studies on trenching. This result shows that under specific conditions it is applicable to estimate the time of faulting based on headwater erosion rate of gullies on uplift wall.

Key words: gully, headwater erosion, faulting event, Dushanzi anticline, Dushanzi fault