Citation: | WANG Ji-long, WU Zhong-hai, SUN Yu-jun, XU Hao, ZHOU Chun-jing, MA Xiao-xue. THE ORIGIN AND EVOLUTION OF QINGYI RIVER'S DEPOSITS AND TERRACES IN WEST SICHUAN, CHINA[J]. Journal of Geomechanics, 2016, 22(3): 642-658. |
Based on the analysis of previous research results, we analysed and summaried the gravel composition, gravel particle size and gravel direction of Mingshan-Qionglai and Danling-Simeng gravel layers related to ancient Qingyi River diversion in southwest of Longmenshan. Moreover, we discussed the characteristics of provenance region, origin and formation of the gravel layer. Combining with the latest survey and measurements to trunk stream terrace of Qingyi River, the distribution, height, structure and age of the terrace were sorted and summarized. We also used the satellite remote sensing image and Digital Elevation Model (DEM) to extract tectonic geomorphology and water features, finding that the terrain of Qingyi River basin descends in a cascade manner, the fold passed through it should be earlier than the Quaternary, the terraces of Qingyi River formed in Quaternary can be continuously contrasted, the terrace in Baoxing-Lushan section ever uplifted, that may be caused by the underlying thrust fault. Based on the characteristics of Qingyi River terraces, we made a comprehensive analysis on the system evolution, then put forward that the diversion of the river is caused by the multiple captures of the river, the local uplift at the southwest segment of Longmenshan caused by the blind thrust fault has created good structure conditions.
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The main geological structures and watershed distribution in stuty area
Regional teclonics and topographic geological profile map
The lithology histogram of Mingqiong and Dansi gravel layer in Qingyijiang River Basin
Old gravel layer platform profile in Mingqiong syncline valley
Terraces profile of Qingyi River at Maojiaba, Lushan
Terraces profile of Qingyi River at Huangnigang, Yaan
Terraces profile of Qingyi River at Tianjiabao, Yaan
Terrace profile of Qingyi River at Yangping, Hongya
River terrace phase diagram of modern Qingyi River
Qingyi River basin and part of the ancient river
A speculative capture mode sketch of Qingyi River basin