Abstract
The alpine topography observed in many mountainous regions is thought to have formed during repeated glaciations of the Quaternary period1,2. Before this time, landscapes had much less relief1,2,3. 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 10Be and 26Al concentrations4,5. 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 valley6, 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.
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Acknowledgements
Financial support was provided by internal UNIS funding to E.F.G., the ConocoPhillips/Lundin Northern Area Program and internal UNIS funding to A.H. and Arctic Field Grants from Svalbard Science Forum/Norwegian Research Council (ris ID 2801/364). Logistical support was provided by UNIS and the AWIPEV base run by the Alfred-Wegener Institute for Polar and Marine Research and the Institut Polaire Français Paul Emile Victor (IPEV). We sincerely thank our field assistants H. Dannevig, J. Fjellanger, T. Hipp, H. Kaasin, C. P. Nielsen, B. A. Skjæret and T. Snøtun. We thank our sponsors (see http://www.icebound.no). We acknowledge comments on earlier drafts from D. Benn, B. Etzelmüller, Ó. Ingólfsson, J. O. Hagen, M. Kelly and J. Mangerud.
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A.H. initiated this research. E.F.G. and A.H. collected the field data and prepared rocks for cosmogenic radionuclide dating. N.A. chemically prepared the samples for 10Be and 26Al measurements. P.W.K. performed AMS measurements. E.F.G., J.P.B., A.H. and O.S. interpreted the data. J.F. assisted with the calculations. E.F.G., J.P.B. and A.H. wrote the manuscript.
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Gjermundsen, E., Briner, J., Akçar, N. et al. Minimal erosion of Arctic alpine topography during late Quaternary glaciation. Nature Geosci 8, 789–792 (2015). https://doi.org/10.1038/ngeo2524
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DOI: https://doi.org/10.1038/ngeo2524
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