气候变化领域集成服务门户(CCPortal): Two-staged uplift of the southeast margin of the Tibetan plateau revealed by river longitudinal profiles

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DOI	10.3389/feart.2023.1124362
	Two-staged uplift of the southeast margin of the Tibetan plateau revealed by river longitudinal profiles
	Pan, Rouxian; Han, Zhiyong; Su, Qi; Li, Guangwei; Li, Xusheng; Li, Yalin; Wang, Xianyan
发表日期	2023
EISSN	2296-6463
卷号	11
英文摘要	The Jinsha River, upstream of the Yangtze River, flows through the southeastern margin of the plateau, providing an opportunity to study the plateau uplift relative to the Sichuan basin through fluvial geomorphology. Eight tributaries of the Jinsha River located at the transition boundary from the plateau to the basin were analyzed for the feature of longitudinal profile and its evolution. The spatial distribution of slope-break knickpoints in the catchment was determined by slope-area analysis and integration analysis. Further, the magnitude and timing of the base level lowering (i.e., uplift of the Tibetan Plateau) were estimated by reconstructing the river longitudinal profile. The results show that there are two levels of slope-break knickpoints, with average elevations of 2865 m and 1523 m, corresponding to base levels relatively lowering of 1400 m and 1100 m, respectively. With reference to the long-term downcutting rate of the Jinsha River, the timings of these two phases base level lowering and uplifts are estimated to be similar to 21-24 and similar to 7-13 Ma, respectively. These are close to the timing of two uplifts revealed by inversion modeling of river longitudinal profiles. Therefore, the uplift of the studied region on the Tibetan Plateau can be divided into two stages, the early stage (similar to 20 Ma) uplift from 1500 to 2900 m and the late stage (similar to 10 Ma) uplift from 2900 to 4000 m, which further supports the staged outside uplift of the Tibetan Plateau.
关键词	Tibetan Plateau (TP)uplift Jinsha River longitudinal profile knickpoint
英文关键词	EASTERN TIBET; TOPOGRAPHIC ANALYSIS; SHORT COMMUNICATION; RELIEF GENERATION; CENOZOIC UPLIFT; LONGMEN SHAN; EVOLUTION; GROWTH; CONSTRAINTS; EXHUMATION
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000955758900001
来源期刊	FRONTIERS IN EARTH SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283859
作者单位	Nanjing University; Beijing Normal University; Nanjing University
推荐引用方式 GB/T 7714	Pan, Rouxian,Han, Zhiyong,Su, Qi,et al. Two-staged uplift of the southeast margin of the Tibetan plateau revealed by river longitudinal profiles[J],2023,11.
APA	Pan, Rouxian.,Han, Zhiyong.,Su, Qi.,Li, Guangwei.,Li, Xusheng.,...&Wang, Xianyan.(2023).Two-staged uplift of the southeast margin of the Tibetan plateau revealed by river longitudinal profiles.FRONTIERS IN EARTH SCIENCE,11.
MLA	Pan, Rouxian,et al."Two-staged uplift of the southeast margin of the Tibetan plateau revealed by river longitudinal profiles".FRONTIERS IN EARTH SCIENCE 11(2023).