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Geoscience ›› 2017, Vol. 31 ›› Issue (01): 71-80.

• Structural Geology • Previous Articles     Next Articles

Characteristics of Structural Geomorphology and Segmentation of Sertengshan Piedmont Fault from Dahoudian to Wayaotan

LONG Jianyu(), HE Zhongtai(), ZHANG Hao, MA Baoqi   

  1. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, CEA, Beijing 100085, China
  • Received:2016-03-24 Revised:2016-11-24 Online:2017-02-10 Published:2017-03-16

Abstract:

Sertengshan piedmont fault is located in the middle-west segment of Yingshan Mountain, controlling the north boundary of Linhe basin with a strong movement since the Late Quaternary. Based on the field investigation and measurements of Sertengshan piedmont fault from Dahoudian to Wayaotan, it is revealed the segment is not a single arcual fault in the NE direction but two secondary segments which are the east-trending Hongqicun segment (Dahoudian-Wubulangkou) and the southeast-trending Kuluebulong segment (Wubulangkou-Wayaotan). There are four terraces along the fault. The age of T3 terrace is 50-70 ka in which lacustrine deposits are from Hetao lake. The age of T2 terrace is 20-30 ka. The terrace scale and landscape between Hongqicun segment and Kuluebulong segment are different. The average height of the Holocene T1 terrace is 5.37 m in the Hongqicun segment and 8.1 m in Kuluebulong segment. The ages of them are respectively 6.23 ka and 12.36 ka. T1 terrace in the two segments is composed by fluvial deposits. The average vertical slip rate is 0.86 mm/a and 0.65 mm/a, respectively. The characteristics of geometrical distribution, structural landscape, kinematics of the fault are completely different. So the two segments are independent from each other. There is a T-shaped junction between the two segments.

Key words: Sertengshan, landscape, terrace, fault scarp, fault segmentation

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