Timing of river capture in major Yangtze River tributaries: Insights from sediment provenance and morphometric indices
文献类型：期刊论文
| 作者 | Fan, Niannian1; Kong, Ping2; Robl, Jorg Christian3; Zhou, Hongwei4; Wang, Xianyan5; Jin, Zhangdong6; Liu, Xingnian1 |
| 刊名 | GEOMORPHOLOGY
 |
| 出版日期 | 2021-11-01 |
| 卷号 | 392页码:15 |
| ISSN号 | 0169-555X |
| 关键词 | Eastern Tibetan Plateau River capture Fluvial deposits provenance Morphological analyses |
| DOI | 10.1016/j.geomorph.2021.107915 |
| 通讯作者 | Fan, Niannian(fanniannian@scu.edu.cn) |
| 英文摘要 | The eastern margin of the Tibetan Plateau represents one of the morphologically most active regions on Earth, where the interplay of recent crustal deformation and subsequent fluvial landscape adjustment has affected the course of continental-scale rivers by river piracy events. Based solely on field observations, such an event has been hypothesised for two of the largest tributaries of the Yangtze River: the Jialing and Hanjiang Rivers. To test this hypothesis, we employ a novel combination of independent methods including a provenance study based on age distributions of detrital zircons from both modern riverbeds and river terraces and a morphometric analysis of river channels and drainage divides. We supported the morphometric analysis with a time-dependent numerical model describing the evolution of river channel long profiles and drainage divides in a succession of river capture events. Analysed zircon ages show clearly distinguishable distributions for the modern Jialing and Hanjiang Rivers, but similar distributions for the recent Hanjiang River up to its topmost terraces. This suggests that the capture of the Hanjiang headwaters by the Jialing River is unlikely to have taken place during the last 1.2 million years. However, several knickpoints in the main stem and the tributaries of the Jialing River cluster at an elevation of about 900 m and separate steeper (downstream) from less steep channel segments (upstream), which is consistent with the morphological expression of a major capture event. chi mapping indicates drainage divide asymmetry at catchment scale with on average steeper rivers on the Jialing side, whereas Gilbert metrics show a symmetric divide at hillslope scale. This numerical model explains this apparent contradiction by the travel time of capture-related knickpoints from the capture point towards the watershed, where chi mapping indicates divide asymmetry immediately after the river capture, while Gilbert metrics are only affected as soon as the knickpoints reach the channel heads and the divide effectively starts moving. Based on knickpoint travel distances and constraints on regional incision / uplift rates, we estimate the possible date of river capture to be the Pliocene. This is earlier than the formation of the terraces investigated in the provenance study but recent enough that most of the drainage divides are still unaffected and currently almost stable. Only the wind gap located in the almost dry valley connecting the two competing drainage systems is likely to have shifted towards the Hanjiang side. We suggest that this resulted in the capture of another important tributary of the Hanjiang River (the Heishui River) by the Jialing drainage system. Our results illustrate the complex evolution of drainage networks along the eastern margin of the Tibetan Plateau, and highlight the importance for combining provenance and morphometric analyses in regions of active landscape rejuvenation where river captures are likely to occur. (c) 2021 Elsevier B.V. All rights reserved. |
| WOS关键词 | LANDSCAPE EVOLUTION ; EASTERN ALPS ; DRAINAGE ; BASIN ; INCISION ; ZIRCON ; UPLIFT ; TECTONICS ; PLATEAU ; CONSTRAINTS |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000709550900002 |
| 源URL | [http://ir.ieecas.cn/handle/361006/17136]  |
| 专题 | 地球环境研究所_加速器质谱中心 |
| 通讯作者 | Fan, Niannian |
| 作者单位 | 1.Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, POB 9825, Beijing 100029, Peoples R China 3.Univ Salzburg, Dept Geog & Geol, A-5020 Salzburg, Austria 4.Shaanxi Normal Univ, Northwest Inst Hist Environm & Socioecon Dev, Xian 710119, Peoples R China 5.Nanjing Univ, Sch Geog & Ocean Sci, Nanjing 210023, Peoples R China 6.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fan, Niannian,Kong, Ping,Robl, Jorg Christian,et al. Timing of river capture in major Yangtze River tributaries: Insights from sediment provenance and morphometric indices[J]. GEOMORPHOLOGY,2021,392:15. |
| APA | Fan, Niannian.,Kong, Ping.,Robl, Jorg Christian.,Zhou, Hongwei.,Wang, Xianyan.,...&Liu, Xingnian.(2021).Timing of river capture in major Yangtze River tributaries: Insights from sediment provenance and morphometric indices.GEOMORPHOLOGY,392,15. |
| MLA | Fan, Niannian,et al."Timing of river capture in major Yangtze River tributaries: Insights from sediment provenance and morphometric indices".GEOMORPHOLOGY 392(2021):15. |
入库方式： OAI收割
来源：地球环境研究所
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