
Dynamic paleo-landscape reconstruction revealing incision process of Three Gorges of Yangtze River
Zihan TIAN, Yanhui SUO, Sanzhong LI, Xuesong DING, Xu HAN, Shuangshuang SONG, Xinjian FU
Dynamic paleo-landscape reconstruction revealing incision process of Three Gorges of Yangtze River
The Yangtze River,Asia's largest river,represents a significant geomorphological event within the integrated tectonics-climate-landscape system of the Cenozoic era in China. A key point of debate in understanding its formation is the timing of the incision of the Three Gorges,situated between the Sichuan and Jianghan basins,which marked the emergence of the modern Yangtze River. Despite abundant geological data,there remains controversy over when exactly the Three Gorges were formed or incised. Previous studies usually focused on isolated factor affecting the river development,e.g., tectonic movements,sedimentology,paleo-climate and sea level changes,to resolve this key issue. In contrast,our study utilizes Badlands,a software for simulating paleo-landscape,to integrate these key factors quantitatively. Focusing on the area east of the “first bend”(Shigu Town in Yunnan Province)of the Yangtze River,we used Badlands to reconstruct the paleo-landscape and river system evolution process since the Late Cretaceous(80 Ma). We further validated our model results using seismic data from the Sichuan and Jianghan basins. The results revealed that the river flow direction in the Sichuan Basin was reversed to drain northwards due to the Late Eocene-Oligocene uplift in the eastern Tibet and the southwestern Upper Yangtze Plate. The Jianghan Basin maintained a consistently low base level during the early Paleogene,influenced by the continental rifting environment in eastern China. The reversal of the drainage direction in the Sichuan Basin and the long-lasting low base level in the Jianghan Basin eventually made the Three Gorges to be incised at the latest Oligocene. We propose that the reversal and subsequent capture of the Upper Yangtze River's flow by the middle Yangtze River played a crucial role in the incision mechanism of the Three Gorges.
paleo-landscape reconstruction / Three Gorges incision / Late Oligocene / Sichuan Basin / Jianghan Basin / drainage inversion
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