• 责任者：Wang Ping (School of Geography Science ; Nanjing Normal University ; Nanjing 210023 ; China) ; Liu Shaofeng
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(3)
• 关键词：弧形构造 ; arcuate structure ; 水系 ; drainage system ; 四川盆地 ; Sichuan Basin
• 页码：p.461-470
• 图表：illus., 48 refs.
• 分类号：1400
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

Based on DEM（ Digital Elevation Model） ,the topography characters and drainage patterns are analyzed in two arcuate fold-thrust belts in eastern Sichuan basin, the Dabashan fold-thrust belt and the eastern Sichuan-western Hubei and Hunan fold-thrust belt. They are both formed as thin-skinned fold-thrust belts during Late Jurassic to Cretaceous,and involved the Paleozoic platform sequence and Late Triassic-Jurassic foreland sequence. Our results indicate that 1 ） the ancient structural deformation control the distribution of the large-scale topography today in the two arcuate fold-thrust belts. The high-elevation, high-relief topography in Dabashan fold-thrust belt is dominantly related to the SW oriented thrusting structures established during Late Jurassic to Early Cretaceous. In contrast,the high-elevation,low-relief topography in eastern Sichuan-western Hubei and Hunan fold-thrust belt is highly related to the NW oriented thin-skinned folding structures established during Late Cretaceous; 2）the kinematics of thrusting and folding propagation control the present-day drainage pattern in the two arcuate fold-thrust belts. The Dabashan fold-thrust belt is dominated by range-parallel rivers developed during SW oriented thrusting propagation, while the eastern Sichuan-western Hubei and Hunan fold-thrust belt is dominated by range-transverse rivers developed during lateral propagation of the fold-thrust belt. Such kinematic of lateral propagation caused the along- strike uplift first occurring on the ＂midline＂ of the eastern Sichuan-western Hubei and Hunan fold-thrust belt, leading to a ＂midline＂ drainage divide between the SW-flowing and NE-flowing range-parallel rivers. Our results also provide new clues for Yangtze River evolution in the Three Gorges regions. We interpret this segment of Yangtze River to be an antecedent range-parallel river that was formed during Early Cretaceous E-W trending deformation. The Gorges could not have been cut across until the late stage NE trending deformation occurred and superposed onto the early stage E-W folds during Late Cretaceous or later.