Cosmogenic Be dating of the Salpausselkä I Moraine in southwestern Finland |
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| Authors: | Vincent R Rinterknecht Peter U Clark Grant M Raisbeck Franoise Yiou Edward J Brook Silvio Tschudi Juha P Lunkka |
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| Institution: | aDepartment of Geosciences, Oregon State University, 104 Wilkinson Hall, Corvallis, OR 97331-5506, USA;bCentre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3/CNRS, Bât. 104 et 108, 91405 Orsay Campus, France;cInstitute of Geology, University of Berne, 3012 Berne, Switzerland;dInstitute of Geosciences, University of Oulu, P.O. Box 3000, Linnanmaa 90014, Finland |
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| Abstract: | We determined in situ cosmogenic 10Be ages for nine boulders sampled on the Salpausselkä I (Ss I) Moraine. Previous dating of this moraine indicated that it formed during the Younger Dryas Stadial along the southern margin of the Scandinavian Ice Sheet in southern Finland. Our new exposure ages range from 10.9±1.0 to 13.5±1.2 10Be ka, with an error-weighted mean age of 12.4±0.7 10Be ka. Our results confirm four previous 10Be ages obtained 40 km northeast of our sample location. The combined data (n=13) indicate that retreat from the Ss I Moraine occurred at 12.5±0.7 10Be ka, in excellent agreement with an age of 12.1 ka for retreat from the Ss I Moraine based on varve chronologies. These results identify the Ss I Moraine as among the best-dated margins associated with Late Quaternary ice sheets. |
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