Cosmogenic 10 Be ages on the Pomeranian Moraine, Poland |
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| Authors: | VINCENT R RINTERKNECHT LESZEK MARKS JAN A PIOTROWSKI GRANT M RAISBECK FRANÇOISE YIOU EDWARD J BROOK PETER U CLARK |
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| Institution: | Vincent R. Rinterknecht (e-mail: ), Department of Geosciences, Oregon State University, Corvallis, OR 97331–5506, USA (present address: Lamont-Doherty Earth Observatory, Geochemistry Building, 61 Route 9W, Palisades, NY 10964–8000, USA);Leszek Marks, Polish Geological Institute, Rakowiecka 4, 00–975 Warsaw, Poland;Jan A. Piotrowski, Department of Earth Sciences, University of Aarhus, C.F. Møllers Allé120, DK-8000 Ärhus C, Denmark;Grant M. Raisbeck, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Bâtiments 104 et 108, 91405 Orsay Campus, France;Françoise Yiou, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Bâtiments 104 et 108, 91405 Orsay Campus, France;Edward J. Brook and Peter U. Clark, Department of Geosciences, Oregon State University, Corvallis, OR 97331–5506, USA |
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| Abstract: | Rinterknecht, V. R., Marks, L., Piotrowski, J. A., Raisbeck, G. M., Yiou, F., Brook, E. J. & Clark, P. U. 2005 (May): Cosmogenic 10Be ages on the Pomeranian Moraine, Poland. Boreas , Vol. 34, pp. 186–191. Oslo. ISSN 0300–9483.
We measured the 10Be concentrations in boulders collected from the Pomeranian Moraine in Poland, providing the first direct dating of the southern margin of the Scandinavian Ice Sheet (SIS) in the Polish Lowland. The mean age of 8 10Be ages of the Pomeranian Moraine in northwestern Poland is 14.30.8 10Be ka, while in northeastern Poland the mean age of 19 10Be ages of the moraine is 15.00.5 10Be ka. Given the excellent agreement between the two age groups, we calculate a mean age of 14.80.4 10Be ka for final deposition of the Pomeranian Moraine of northern Poland. The age of the Pomeranian Moraine suggests that the southern margin of the SIS was near its maximum extent in Poland at a younger time than previously inferred, and that retreat from the moraine at 14.80.4 10Be ka probably occurred in response to the onset of the Bølling interstade. |
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