Evolution of a landslide‐dammed lake during the Holocene: Records from lacustrine and fan‐delta successions in southeastern Tibet

作者：Anna Yang, Kaiheng Hu, Hao Wang, Weiming Liu, Qiyuan Zhang, Shuang Liu, Hao Li · 发表于：Earth Surface Processes and Landforms · 年份：2025 · DOI：10.1002/esp.70104 · 被引用次数：4 · 研究领域：Geology and Paleoclimatology Research、Geological formations and processes、Geological and Geophysical Studies

Abstract Landslide‐ or glacier‐dammed lakes and associated catastrophic outburst floods represent key geomorphological agents in shaping fluvial landscapes in high‐altitude, steep mountain environments. Previous studies have reported hundreds of Late Pleistocene moraine/glacier and landslide dams caused by glacier advances or seismic activity across the southeastern Tibetan Plateau, and confirmed that these dammed lakes significantly impeded river incision into the plateau interior. However, comprehensive exploration for geomorphological and sedimentological records documenting the complete evolutionary cycles of such dammed lakes remains scarce. This study identifies a well‐preserved lacustrine‐fan delta sedimentary succession associated with the Xiaqu dammed lake in the Yigong Tsangpo basin. Through integrated field observations, sedimentological analyses and chronological data obtained through optical stimulated luminescence (OSL) and AMS radiocarbon dating techniques, we reconstruct the full evolutionary history of the lake, which underwent five distinct evolutionary stages, including initial formation, abrupt failure, secular stability, sedimentary infilling and fluvial incision. The initial landslide dam created at a height of 2,650 m above sea level (a.s.l.) may experience rapid breaching when lake water overtopped the crest, triggering outburst flood event(s). Continuous lacustrine sediments deposited between 4.74 ka and 3.11 ka imply a relative stability period for t...