Late Cenozoic locally landslide-dammed lakes across the Middle Yangtze River

Yang, Ye; Xu, Sheng; Binnie, Steven A.; Ritter, Benedikt; Cui, Lifeng; Cao, Zhen-Ping; Zhang, Shun-Cheng; Liu, Cong‐Qiang; Dunai, Tibor J.

doi:10.1016/j.geomorph.2022.108366

Cited by 3 publications

(3 citation statements)

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“…One perspective posits that the lacustrine sediments originated from a vast paleo-lake known as "Xigeda", located in the southeastern Tibetan Plateau [26][27][28]55]. In contrast, an alternative stance suggests that the lacustrine sediments may have resulted from localized damming of the Jinsha River or its tributaries, highlighting the absence of continuous lacustrine sediments and the presence of landslide deposits as supporting evidence [29][30][31][32]. Further investigation and evaluation are crucial to reconcile these differing theories and gain comprehensive insights into the long-term drainage evolution of the southeastern Tibetan Plateau.…”

Section: Discussionmentioning

confidence: 99%

“…In the Qiaojia reach, the deposition age of lacustrine sediments was dated to be 629-20 ka [17]. Additionally, the lacustrine sediments in the Da River and the Anning River were dated to be 1000-500 ka [32]. Second, in the same river reach, the deposition age of lacustrine terraces with higher altitudes is older than that of lacustrine terraces at low altitudes.…”

Section: Discussionmentioning

confidence: 99%

“…In this model, the modern Jinsha River flowed eastward and incised down from the lacustrine sediments after the paleo lake breached at about 1.3 Ma. Another model thought that the fluvio-lacustrine sediments were deposited by individual dammed lakes induced by landslide, debris, and glaciation in the Pleistocene, and that no regional paleo lake existed [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Geochronological and Sedimentological Study of the Fluvio-Lacustrine Deposits from Shigu to Longjie: Implications for the Evolution of the Lower Jinsha River since the Early Pleistocene

Liu,

Gao,

et al. 2023

Water

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The formation of the Jinsha River drainage is a significant subject of concern in the geological and geomorphological fields. Among them, one key question is whether there was a regional paleo lake into which Lower Jinsha River drainage drained during the late Pliocene to early Pleistocene, due to massive fluvio-lacustrine sediments widely distributed in the Lower Jinsha River. Nevertheless, there has yet to be a consensus on the genesis of those fluvio-lacustrine sediments due to poor sedimentological and chronological data. In this study, to unravel the origin of those fluvio-lacustrine sediments and the formation model of the Lower Jinsha River, sedimentary characteristics, including spatial distribution, lithological composition, and stratigraphic contact relationship of those fluvio-lacustrine sediments were analyzed, and chronological determination of the fluvio-lacustrine sediments using Electron Spin Resonance and Optically stimulated luminescence method was conducted. The results show that in the Lower Jinsha River, the lacustrine sediments are mainly composed of silt and clay, with apparent horizontal bedding, stacked with fluvial cobble-gravel and sand, and are in unconformable contact with the underlying bedrock strata or paleo soil. The lacustrine sediments are spatially discontinuous and mainly distributed in the Shigu, Taoyuan, Panzhihua, and Longjie reaches. Downstream of these reaches are deeply incised gorges with an average slope >30°, and many landslide landforms and deposits can be identified here. In each reach, the lacustrine sediments were closely distributed along the trunk and tributary channels in the plane and were distributed at different altitudes, forming a sequence of lacustrine terraces. Chronological analysis shows that in different reaches, the deposition ages of lacustrine sediments are significantly different. In each reach, the deposition age of the lacustrine terraces of high altitude is older than that of low altitude. The above characteristics collectively indicate that the lacustrine sediments in the Lower Jinsha River were locally deposited by individual dammed lakes, probably induced by landslide rather than a regional paleo lake by tectonic activities. During the incision process of the river valley, landslides continuously block the river channel, forming dammed lakes, and then deposited lacustrine sediments at different elevations, forming lacustrine terraces. The lacustrine sediment of the topmost lacustrine terrace in Panzhihua reach was dated to be 1.78 Ma, combined with previous studies on the fluvial terraces, indicating the Lower Jinsha River existed and started to incise its valley before the early Pleistocene. The widespread dammed lake sediment indicates that the formation of the Jinsha River valley follows the pattern of “incision-landslide-damming-aggradation-incision”.

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