Drainage reorganization near the eastern margin of the Tibetan Plateau as a result of fluvial response to differential uplift enhanced by isostatic compensation

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-09-01 DOI:10.1016/j.gloplacha.2025.105052

Qinhong Mo , Zhenbo Hu , David Bridgland , Menghao Li , Baotian Pan , Zijuan Dong , Xiaohua Li , Meiling Zhong , Renzhe Pan , Ningyi Li , Rob Westaway

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Abstract

Drainage reorganization is affected by the relationships between tectonically driven rock uplift, climatically modulated denudation, and isostatic (atectonic) compensation, conveying signals of tectonic and climatic changes into processes of landscape evolution. Drainage-divide migration as a marker of drainage reorganization is a key to understanding these processes; however, previous studies on the differential rock uplift seem to have overlooked the contributions from surface erosion and isostatic compensation, due to a lack of natural archives for further verification. We have therefore conducted a combined study of geomorphological indices and natural records to categorize a remarkable case of drainage-divide migration between the Jialing and Min rivers near the eastern margin of the Tibetan Plateau, characterized by active tectonic deformation and significant spatial difference in denudation. Reconstruction of this drainage change is based on multiple geomorphological indices, including normalized channel steepness and χ-map, in combination with constraining the timing of drainage-divide migration to <11.1 ka, using cosmogenic radionuclide exposure dating. Our results attribute divide migration at the eastern margin of the Tibetan Plateau primarily to differential tectonic uplift, which may have been further enhanced by isostatic compensation in response to uneven distribution of denudation induced by differences in precipitation and landslides, thus implying the coupling between crustal processes and climate in driving landscape evolution.

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流域重组受构造驱动的岩石隆升、气候调节的剥蚀和均衡（非构造）补偿之间的关系影响，将构造和气候变化的信号传递到景观演化过程中。分水岭迁移作为排水重组的标志是理解这些过程的关键；然而，由于缺乏进一步验证的自然档案，以往对岩石差异隆升的研究似乎忽略了地表侵蚀和均衡补偿的贡献。基于归一化河道陡度和χ-map等多种地貌指标，结合宇宙成因放射性核素暴露定年技术，将流域划分迁移时间限制在11.1 ka，重建了这一流域变化。

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.