globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.07.030
Scopus记录号: 2-s2.0-84979740733
论文题名:
Recycling of Pleistocene valley fills dominates 135 ka of sediment flux, upper Indus River
作者: Munack H.; Blöthe J.H.; Fülöp R.H.; Codilean A.T.; Fink D.; Korup O.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 149
起始页码: 122
结束页码: 134
语种: 英语
英文关键词: Drainage capture ; In-situ cosmogenic 10Be ; Indus ; Transhimalaya ; Valley fill ; Zanskar
Scopus关键词: Catchments ; Landforms ; Recycling ; Rivers ; Runoff ; Cosmogenic ; Indus ; Transhimalaya ; Valley fills ; Zanskar ; Sediments ; beryllium isotope ; catchment ; cosmogenic radionuclide ; denudation ; dissection ; headwater ; incised valley ; infill ; marine isotope stage ; Pleistocene ; sediment transport ; sediment yield ; valley fill ; water erosion ; China ; Himalayas ; India ; Indus River ; Jammu and Kashmir ; Qinghai-Xizang Plateau ; Sutlej River ; Tso Kar ; Tso Moriri ; Zanskar Himalayas
英文摘要: Rivers draining the semiarid Transhimalayan Ranges at the western Tibetan Plateau margin underwent alternating phases of massive valley infill and incision in Pleistocene times. The effects of these cut-and-fill cycles on millennial sediment fluxes have remained largely elusive. We investigate the timing and geomorphic consequences of headward incision of the Zanskar River, a tributary to the Indus, which taps the >250-m thick More Plains valley fill that currently plugs the endorheic high-altitude basins of Tso Kar and Tso Moriri. In situ 10Be exposure dating and topographic analyses show that a phase of valley infill gave way to net dissection and the NW Himalaya's first directly dated stream capture in late Marine Isotope Stage (MIS) 6, ∼135 ka ago. Headwaters of the Indus are currently capturing headwaters of the Sutlej, and rivers have eroded >14.7 km3 of sediment from the Zanskar headwaters since, mobilising an equivalent of ∼8% of the Indus' contemporary sediment storage volume from only 0.3% of its catchment area. The resulting specific sediment yields are among the rarely available rates averaged over the 105-yr timescale, and surpass 10Be-derived denudation rates from neighbouring catchments three- to tenfold. We conclude that recycling of Pleistocene valley fills has fed Transhimalayan headwaters with more sediment than liberated by catchment denudation, at least since the last glacial cycle began. This protracted release of sediment from thick Pleistocene valley fills might bias estimates of current sediment loads and long-term catchment denudation. © 2016 Elsevier Ltd
资助项目: The Potsdam Graduate School (PoGS), the German Research Foundation (KO3937/1,2), and the Potsdam Research Cluster for Georisk Analysis, Environmental Change and Sustainability (PROGRESS) funded this research. We are grateful to Peter Clift and an anonymous reviewer for thorough and constructive reviews. We thank Amelie Stolle, Martin Struck, Piero Catarraso, and Tinles Nubuu for fieldwork assistance (photos in Fig. 2G, H courtesy of Amelie Stolle), and Eduardo Garzanti for scientific advice. We used the R software environment (cran.r-project.org), QGIS Geographic Information System (qgis.org), and SAGA-GIS (saga-gis.org) for processing data. Xiaoping Yang kindly handled the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59474
Appears in Collections:过去全球变化的重建

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作者单位: Institute of Earth and Environmental Science, University of Potsdam, Potsdam, Germany; Department of Geography, University of Bonn, Bonn, Germany; School of Earth and Environmental Science, University of Wollongong, Wollongong, NSW, Australia; Institute for Environmental Research (IER), ANSTO Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia

Recommended Citation:
Munack H.,Blöthe J.H.,Fülöp R.H.,et al. Recycling of Pleistocene valley fills dominates 135 ka of sediment flux, upper Indus River[J]. Quaternary Science Reviews,2016-01-01,149
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