Timing of the Last Deglaciation in Belarus
We measured Be-10 concentrations in boulders collected from the Orsha and Braslav moraines, associated with the Last Glacial Maximum extent and a recessional stage of the Scandinavian Ice Sheet (SIS), respectively, providing a direct dating of the southeastern sector of the ice-sheet margin in Belar...
| Published in: | Boreas |
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| Main Authors: | , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2007
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| Subjects: | |
| Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/timing-of-the-last-deglaciation-in-belarus(bc539a94-9bdd-47d6-a0a7-1773069192d6).html https://doi.org/10.1080/03009480601134694 http://www.scopus.com/inward/record.url?scp=34347256158&partnerID=8YFLogxK |
| Summary: | We measured Be-10 concentrations in boulders collected from the Orsha and Braslav moraines, associated with the Last Glacial Maximum extent and a recessional stage of the Scandinavian Ice Sheet (SIS), respectively, providing a direct dating of the southeastern sector of the ice-sheet margin in Belarus. By combining these data with selected existing radiocarbon ages, we developed a chronology for the last deglaciation of Belarus. The northeastern part of the country remained ice free until at least 19.29 +/- 0.2 cal. kyr BP, whereas the northwestern part of the country was ice free until 22.39 +/- 1.5 cal. kyr BP. A lobate ice margin subsequently advanced to its maximum extent and deposited the Orsha Moraine. The ice margin retreated from this moraine at 17.79 +/- 2.0 Be-10 kyr to a position in the northern part of the country, where it deposited the Braslav Moraine. Subsequent ice-margin retreat from that moraine at 13.19 +/- 0.5 Be-10 kyr represented the final deglaciation of Belarus. Direct dating of these moraines better constrains the relation of ice-margin positions in Belarus to those in adjacent countries as well as the SIS response to climate change. |
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