globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116113
论文题名:
Provenance and erosional impact of Quaternary megafloods through the Yarlung-Tsangpo Gorge from zircon U-Pb geochronology of flood deposits, eastern Himalaya
作者: Turzewski M.D.; Huntington K.W.; Licht A.; Lang K.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 535
语种: 英语
中文关键词: erosion ; geochronology ; Himalaya ; megaflood ; zircon
英文关键词: Binary alloys ; Deposits ; Erosion ; Floods ; Geochronology ; Glacial geology ; Lead alloys ; Rivers ; Silicate minerals ; Uranium alloys ; Zircon ; Detrital zircon ; Himalayas ; Historical floods ; megaflood ; Outburst floods ; Pleistocene sediments ; Tibetan Plateau ; Zircon U-Pb geochronologies ; Zircon deposits ; exhumation ; flood ; flood deposit ; geochronology ; Holocene ; impoundment ; outburst ; provenance ; uranium-lead dating ; zircon ; Brahmaputra Basin ; Himalayas
英文摘要: Holocene and Upper Pleistocene sediments in the eastern Himalayan syntaxis represent an extraordinary record of glacial outburst megafloods in one of the most tectonically active landscapes on Earth. Glacial damming and outburst floods in the syntaxis may have focused erosion in the steep Tsangpo Gorge and inhibited river incision into the margin of the Tibetan Plateau. However, few flood slackwater deposits have been studied, and it is unknown which of the hundreds of known glacial impoundments in Tibet may have sourced the floods. Here we report n=1438 new detrital zircon U-Pb data from individual ancient megaflood and historical outburst flood slackwater deposits to examine the provenance and erosive potential of these events. Detrital zircon U-Pb geochronology of megaflood deposits show that megaflood provenance is more consistent with impoundment of the Yarlung River drainage at or west of the Namche Barwa massif, than impoundment of eastern drainages along the Yigong and Parlung Rivers. Compared to active bedload in the Siang River, and historical floods within the same drainage area, megaflood samples overall contain a disproportionately large amount of zircons eroded from the Tsangpo Gorge. We interpret this preferential derivation to reflect preferential erosion during large discharge events—supporting the hypothesis that Quaternary megafloods are a primary contributor to rapid exhumation of the eastern Himalayan syntaxis. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165317
Appears in Collections:气候变化与战略

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作者单位: Department of Earth and Space Sciences, Quaternary Research Center, University of Washington, Seattle, WA, United States; School of Earth and Environmental Sciences, Queens College, Queens, NY, United States; Graduate Center, City University of New York, New York, NY, United States

Recommended Citation:
Turzewski M.D.,Huntington K.W.,Licht A.,et al. Provenance and erosional impact of Quaternary megafloods through the Yarlung-Tsangpo Gorge from zircon U-Pb geochronology of flood deposits, eastern Himalaya[J]. Earth and Planetary Science Letters,2020-01-01,535
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