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Timing of the last deglaciation in Belarus

Abstract : We measured 10Be 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 19.2±0.2 cal. kyr BP, whereas the northwestern part of the country was ice free until 22.3±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 17.7±2.0 10Be 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 13.1±0.5 10Be 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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Submitted on : Monday, September 17, 2007 - 1:29:04 PM
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V.R. Rinterknecht, I.E. Pavlovskaya, P.U. Clark, G.M. Raisbeck, F. Yiou, et al.. Timing of the last deglaciation in Belarus. Boreas, Wiley, 2007, 36, pp.307-313. ⟨10.1080/03009480601134694⟩. ⟨in2p3-00172496⟩



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