globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2524
论文题名:
Minimal erosion of Arctic alpine topography during late Quaternary glaciation
作者: Gjermundsen E.F.; Briner J.P.; Akçar N.; Foros Jø.; Kubik P.W.; Salvigsen O.; Hormes A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:10
起始页码: 789
结束页码: 792
语种: 英语
Scopus关键词: alpine environment ; aluminum ; beryllium isotope ; burial (geology) ; exhumation ; glacial erosion ; glaciation ; Quaternary ; relief ; spatial analysis ; Arctic ; Svalbard ; Svalbard and Jan Mayen
英文摘要: The alpine topography observed in many mountainous regions is thought to have formed during repeated glaciations of the Quaternary period. Before this time, landscapes had much less relief. However, the spatial patterns and rates of Quaternary exhumation at high latitudes-where cold-based glaciers may protect rather than Erode landscapes-are not fully quantified. Here we determine the exposure and burial histories of rock samples from eight summits of steep alpine peaks in northwestern Svalbard (79.5° N) using analyses of 10 Be and 26 Al concentrations. We find that the summits have been preserved for at least the past one million years. The antiquity of Svalbard's alpine landscape is supported by the preservation of sediments older than one million years along a fjord valley, which suggests that both mountain summits and low-elevation landscapes experienced very low erosion rates over the past million years. Our findings support the establishment of northwestern Svalbard's alpine topography during the early Quaternary. We suggest that, as the Quaternary ice age progressed, glacial erosion in the Arctic became inefficient and confined to ice streams, and high-relief alpine landscapes were preserved by minimally erosive glacier armour. © 2015 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106165
Appears in Collections:气候减缓与适应
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作者单位: Department of Arctic Geology, University Centre in Svalbard, PO Box 156, Longyearbyen, Norway; Department of Geology, University at Buffalo, Buffalo, NY, United States; Institute of Geological Sciences, University of Bern, Bern, Switzerland; Charlotte Voigts veg 50, Ranheim, Norway; Institute of Particle Physics, Swiss Federal Institute of Technology, Zurich, Switzerland; Department of Geosciences, University of Oslo, Oslo, Norway; Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden

Recommended Citation:
Gjermundsen E.F.,Briner J.P.,Akçar N.,et al. Minimal erosion of Arctic alpine topography during late Quaternary glaciation[J]. Nature Geoscience,2015-01-01,8(10)
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