RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (03): 420-428.doi: 10.11870/cjlyzyyhj201603008

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THE UPLIFT OF THE LONGMEN SHAN AND THE DRAINAGE RESPONSE

LI Fen-sheng1,2, ZHAO Guo-hua1,2, LI Yong1,2, LIANG Ming-jian3, YAN Liang1,2, YAN Zhao-kun1,2, LI Jing-bo1,2, ZHENG Li-long1,2   

  1. 1. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. Earthquake Administration of Sichuan Province, Chengdu 610041, China
  • Received:2014-06-06 Revised:2014-07-31 Online:2016-03-20
  • Supported by:
    the National Natural Science Foundation of China (Grant No. 41172162 and 41340005)

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Abstract: The Longmen Shan is located in the eastern margin of the Qinghai-Tibetan Plateau. The eastern margin of the Tibetan Plateau is composed of three large-scale geomorphic units: the Tibetan Plateau, the Longmen Shan mountain range and the piedmont alluvial plain (the Western Sichuan Basin) shown respectively from NW to SE. The Longmen Shan borders the eastern margin of Tibetan Plateau. It has a length of about 500km from NE to SW, and a width of about 30km from NW to SE. The difference in relief between the Longmen Shan and the piedmont region is greater than 4000m, with the peak elevation of the mountain range being about 4984m. The elevation of the piedmont ranges only between 450 and 710m. The Longmen Shan is the region with the maximum change in altitude on the edge of the Tibetan Plateau, comprising a series of roughly parallel imbricated thrust belts including the Maowen, Beichuan and Pengguan faults from NW to SE, and has the typical features of a progressive or onward-spread thrust-nappe structure. The Ms 8.0 Wenchuan earthquake of May 12, 2008, in the Longmen Shan mountain range area in China, led to two roughly parallel NE-trending thrust and strike-slip surface ruptures of the Beichuan, Pengguan and the Xiaoyudong faults. Thus, this area has been one of the best places to study the relationships about tectonic-geomorphy-water system. Stream-power incision model is often used to analyze whether the orogenic terrain has been to the equilibrium. This article presents the extraction and analysis of the 15 bedrock channel longitudinal section of the Longmen Shan. By using mathematical functions fitting with the morphological characteristics of longitudinal section, this article takes the relationship between bed rock channel slope (S) and the catchment area (A) to analyze the rivers in Longmen Shan in the eastern margin of the Qinghai-Tibet Plateau. The study has shown that there are 9 logarithmic function lines, 5 exponential function lines and 1 linearity line. The bilogarithmic graph (S-A Figure) of the rivers in Longmen Shan has 9 convex lines, 1 notching line and 5 straight lines, which has shown that the major bedrock river bed elevation of this area had been grown (dz/dt > 0), clined (dz/dt < 0) and unchanged (dz/dt=0) with time. The bilogarithmic graph (S-A Figure) of the south and middle parts at Longmen orogenic terrain is epirelief indicated that this area has not been to the equilibrium and it stays at pre-equilibrium. The bilogarithmic graph (S-A Figure)of the north part is straight indicated that this area has been to its equilibrium. Matching with the clear activity of the middle and south fracture parts at Longmen Shan tectonic zone, the results has shown the expanding to the east of Qinghai-Tibetan Plateau in time and space.

Key words: stream-power incision model, longitudinal profile, steady topography, tectonic movement, Longmen Shan orogenic belt, the eastern margin of the Qinghai-Tibetan Plateau

CLC Number: 

  • P31
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