NEW 10BE COSMOGENIC AGES FROM THE VIMMERBY MORAINE CONFIRM THE TIMING OF SCANDINAVIAN ICE © The authors 2009 Journal compilation © 2009 Swedish Society for Anthropology and Geography 113 NEW 10BE COSMOGENIC AGES FROM THE VIMMERBY MORAINE CONFIRM THE TIMIN
S.P.H.T., 2009: New 10Be cosmogenic ages from the Vimmerby moraine confirm the timing of Scandinavian Ice Sheet deglacia-tion in southern Sweden. Geogr. Ann. 91 A (2): 113–120 ABSTRACT. The overall pattern of deglaciation of the southern part of the Scandinavian Ice Sheet has been considered establi...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.509.15 http://people.su.se/~tjohn/Tim_Johnsen-scientific_publications_files/JOHNSEN et al. - 2009 - NEW 10 BE COSMOGENIC AGES FROM THE VIMMERBY MORAIN.pdf |
| Summary: | S.P.H.T., 2009: New 10Be cosmogenic ages from the Vimmerby moraine confirm the timing of Scandinavian Ice Sheet deglacia-tion in southern Sweden. Geogr. Ann. 91 A (2): 113–120 ABSTRACT. The overall pattern of deglaciation of the southern part of the Scandinavian Ice Sheet has been considered established, although details of the chronology and ice sheet dynamics are less well known. Even less is known for the south Swedish Upland because the area was deglaciated mostly by stagnation. Within this area lies the conspicuous Vimmerby moraine, for which we have used the ter-restrial cosmogenic nuclide (10Be) exposure dating technique to derive the exposure age of six glacially transported boulders. The six 10Be cosmogenic ages are internally consistent, ranging from 14.9 ± 1.5 to 12.4 ± 1.3 ka with a mean of 13.6 ± 0.9 ka. Ad-justing for the effects of surface erosion, snow bur-ial and glacio-isostatic rebound causes the mean age to increase only by c. 6 % to c. 14.4 ± 0.9 ka. The 10Be derived age for the Vimmerby moraine is in agreement with previous estimates for the timing of deglaciation based on radiocarbon dating and varve chronology. This result shows promise for further terrestrial cosmogenic nuclide exposure studies in southern Sweden. Key words: terrestrial cosmogenic nuclide (10Be) exposure dating |
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