Change of the Paleo-Qingyijiang River and the Rise of the Mengdingshan Anticline on the South West Margin of the Sichuan Basin

• 责任者：Wang Gang(College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Tao Xiaofeng
• 刊名：Quaternary Sciences
• 出版年：2010
• 卷期：30(4)
• 关键词：古河道 ; buried channels ; 构造演化 ; structural evolution ; 四川盆地 ; Sichuan Basin
• 页码：p.779-790
• 图表：10 illus., 1 table, 36 refs.
• 分类号：0300
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

The Ya’an-Mingshan area lies in the southwest corner of the Sichuan Basin, where several linear folds including the Mingdingshan anticline occur. A paleo-channel of the Qingyijiang River was identified in DEM and satellite remote sensing images. It controlled the development of an alluvia-fluvial fan named the Ming-Qiong terrace. The upstream of the paleo-Qingyijiang River was captured, and so the Ming-Qiong terrace stopped building. However, one channel of the paleo-river was preserved, and it was then deformed during the rise of the Mingdingshan anticline. The ESR dating shows that the river capture or piracy event occurred in 312.0±3.0 ka. It is estimated from deformation of that paleo-channel that the rise of the Mingdingshan anticline began in 3.2～3.8 Ma. So the rise rate might be 0.46 mm/a.