[快闪报告]Transient knickpoint migrating modulated by fault activities on the Northeastern Tibetan Plateau margin: A case from the Yellow River

Transient knickpoint migrating modulated by fault activities on the Northeastern Tibetan Plateau margin: A case from the Yellow River
编号:1263 稿件编号:2668 访问权限:私有 更新:2023-04-27 22:08:14 浏览:290次 快闪报告

报告开始:2023年05月07日 16:28 (Asia/Shanghai)

报告时间:3min

所在会议:[1C] 1C、第四纪地质与全球变化 » [1C-3] 1C-3 第四纪地质与全球变化

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摘要
Widespread relict surfaces surrounded by transient landscapes which archived the past tectonic uplift are well preserved in the Tibetan Plateau. In the northeastern Tibetan Plateau (NETP), a ubiquitous migrating river knickpoint and erosion wave in the upper Yellow River has been encroaching into the relict landscape from the margin of the plateau. However, the mechanism and the dynamic process of this migrating knickpoint are still not well understood. Here, we use the shear stress incision model in conjunction with numerical landscape simulations to study the dynamic evolution of a ubiquitous knickpoint at similar heights in the upper Yellow River catchment. The results show that since around 1.2 Ma, decreasing fault activity and the reduced uplift rate of the Jishi Mountain at the margin of the NETP gave rise to this transient wave of river erosion. This erosion wave has been migrating into the uplands and encroaching step-by-step into the relict surfaces on the plateau at a rate of ~500 km/Ma. The hard basement could also have modulated the migration of river knickpoint, along with the decreasing of fault activity at the margin of the Tibetan Plateau. This dynamic process might have led to a long lag between the fluvial incision and tectonics on the uplifted plateau.
关键字
relict landscape, migrating knickpoint, transient erosion wave, low-relief surfaces, northeastern Tibetan Plateau, Yellow River
报告人
李正晨
南京大学

稿件作者
李正晨 南京大学
王先彦 南京大学
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李星华(15527964369;lixinghua5540@whu.edu.cn)
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赵 林(18071070948;linzhao@whu.edu.cn)
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