Widespread erosion on high plateaus during recent glaciations in Scandinavia

被引:29
作者
Andersen, Jane L. [1 ]
Egholm, David L. [1 ]
Knudsen, Mads F. [1 ]
Linge, Henriette [2 ,3 ]
Jansen, John D. [1 ]
Pedersen, Vivi K. [2 ,3 ]
Nielsen, Soren B. [1 ]
Tikhomirov, Dmitry [4 ]
Olsen, Jesper [4 ]
Fabel, Derek [5 ]
Xu, Sheng [5 ]
机构
[1] Aarhus Univ, Dept Geosci, Hoegh Guldbergsgade 2, DK-8000 Aarhus C, Denmark
[2] Univ Bergen, Dept Earth Sci, N-5020 Bergen, Norway
[3] Bjerknes Ctr Climate Res, N-5020 Bergen, Norway
[4] Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
[5] Scottish Univ, Environm Res Ctr, AMS Lab, E Kilbride G75 0QF, Lanark, Scotland
来源
NATURE COMMUNICATIONS | 2018年 / 9卷
关键词
BE-10 EXPOSURE AGES; LANDSCAPE EVOLUTION; CLIMATE-CHANGE; ICE SHEETS; RATES; SEDIMENT; SURFACES; NORWAY; UPLIFT; ACCUMULATION;
D O I
10.1038/s41467-018-03280-2
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Glaciers create some of Earth's steepest topography; yet, many areas that were repeatedly overridden by ice sheets in the last few million years include extensive plateaus. The distinct geomorphic contrast between plateaus and the glacial troughs that dissect them has sustained two long-held hypotheses: first, that ice sheets perform insignificant erosion beyond glacial troughs, and, second, that the plateaus represent ancient pre-glacial landforms bearing information of tectonic and geomorphic history prior to Pliocene-Pleistocene global cooling (similar to 3.5 Myr ago). Here we show that the Fennoscandian ice sheets drove widespread erosion across plateaus far beyond glacial troughs. We apply inverse modelling to 118 new cosmogenic Be-10 and Al-26 measurements to quantify ice sheet erosion on the plateaus fringing the Sognefjorden glacial trough in western Norway. Our findings demonstrate substantial modification of the pre-glacial landscape during the Quaternary, and that glacial erosion of plateaus is important when estimating the global sediment flux to the oceans.
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页数:7
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