DOI: 10.1016/j.quascirev.2018.05.037
Scopus记录号: 2-s2.0-85047856511
论文题名: Sedimentary records of a palaeo-lake in the middle Yarlung Tsangpo: Implications for terrace genesis and outburst flooding
作者: Hu H.-P. ; Feng J.-L. ; Chen F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 192 起始页码: 135
结束页码: 148
语种: 英语
英文关键词: Aeolian deposits
; Glacier constrained lake
; Lake sediments
; Terrace
; Yarlung Tsangpo
Scopus关键词: Floods
; Glacial geology
; Lakes
; Sea level
; Sedimentology
; Aeolian deposition
; Aeolian deposits
; Lake sediments
; Last glacial period
; Sedimentary records
; Sedimentary sequence
; Terrace
; Yarlung Tsangpo
; Landforms
英文摘要: The middle reaches region of the Yarlung Tsangpo in the southern Tibetan Plateau consist of broad valley reaches, alternating with gorges, which were easily dammed by glaciers and/or glacial moraines during the last glacial period. We investigated three palaeo-lake sedimentary sequences on terraces located in the broad Xigazê valley reach and the Dazhuka-Yueju gorge in the middle reaches of the Yarlung Tsangpo. We found that the altitude of the palaeo-lake was 3811 m above sea level, while its minimum area and volume were ∼679 km2 and ∼22 km3, respectively. The palaeo-lake was formed during the period from about 30.2 to 32.3 cal. kyr BP, and it failed at about 13.2 cal. kyr BP. The dam was possibly located at the eastern end of the Dazhuka-Yueju gorge and may have been a glacier and/or a moraine during the late part of the last glacial. The failure of the dam and related flooding from the Dazhuka-Yueju gorge probably triggered a chain reaction of dam failures downstream, forming a megaflood. Terrace genesis and valley evolution in the investigated region can be divided into four phases: Phase Ⅰ (>32.3 cal. kyr BP), river occupation; Phase Ⅱ (<32.3–13.2 cal. kyr BP), palaeo-lake occupation; Phase Ⅲ (after 13.2 cal. kyr BP), erosion and aeolian deposition; Phase Ⅳ modern downward incision. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112146
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; School of Earth Sciences, East China University of Technology, Nanchang, 330013, China; Department of Environmental Economics, Shanxi University of Finance and Economics, Taiyuan, 030006, China
Recommended Citation:
Hu H.-P.,Feng J.-L.,Chen F.. Sedimentary records of a palaeo-lake in the middle Yarlung Tsangpo: Implications for terrace genesis and outburst flooding[J]. Quaternary Science Reviews,2018-01-01,192