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- W4280598839 abstract "The origin of the First Bend of the Yangtze River is key to understanding the birth of the modern Yangtze River. Despite considerable efforts, the timing and mechanism of formation of the First Bend remain highly debated. Inverse river-profile modeling of three tributaries (Chongjiang, Lima, and Gudu) of the Jinsha River, integrated with regional tectonic and geomorphic interpretations, allows the onset of incision at the First Bend to be constrained to 28–20 Ma. The spatio-temporal coincidence of initial river incision and activity of Yulong Thrust Belt in southeastern Tibet highlights thrusting to be fundamental in reshaping the pre-existing stream network at the First Bend. These results enable us to reinterpret a change in sedimentary environment from a braided river to a swamp-like lake in the Jianchuan Basin south of the First Bend, recording the destruction of the hypothesized southwards-flowing paleo-Jinsha and Shuiluo Rivers at ~36–35 Ma by magmatism. During the late Oligocene-early Miocene, the paleo-Shuiluo River was diverted to the north by focused rock uplift due to thrusting along the Yulong Thrust Belt, which also led to exhumation of the Jianchuan Basin. Diversion of the paleo-Shuiluo River can be explained by capture from a downstream river in the footwall of the Yulong Thrust Belt. Subsequent rapid headward erosion, that was caused by thrusting-induced drop of local base level, is recorded by upstream younging ages for the onset of incision and led to the formation of the First Bend. The combination of new ages for the onset of incision at 28–20 Ma at the First Bend and younger ages upstream indicates northwards expansion of the Jinsha River at a rate of 62 ± 18 mm/yr. Our results suggest that the origin of the First Bend was likely triggered by thrusting at 28–20 Ma, after which the Yangtze River formed. • Study examines the timing and formation mechanism of the Yangtze River First Bend. • Applies river long profile inversion and drainage divide stability methods • Onset of incision at the First Bend spans 28–20 Ma • Incision has thrust fault origin leading to capture-related drainage reorganization. • Highlights tectonics as a key driver of long-term landscape development in SE Tibet" @default.
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- W4280598839 date "2022-08-01" @default.
- W4280598839 modified "2023-10-17" @default.
- W4280598839 title "Late Oligocene-early Miocene Origin of the First Bend of the Yangtze River explained by thrusting-induced river reorganization" @default.
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- W4280598839 doi "https://doi.org/10.1016/j.geomorph.2022.108303" @default.
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