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Cosmogenic nuclide calibration: The Baltic Ice Lake drainage
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. (paleoglaciologi/paleoglaciology)
2007 (English)In: Quaternary International, 2007Conference paper, Published paper (Refereed)
Abstract [en]

During retreat of the Fennoscandian ice sheet, a large ice-dammed lake formed along its south-eastern margin. The ice damming this Baltic Ice Lake (BIL) was breached at the northern tip of Mt Billingen, resulting in a catastrophic drainage of ~8000 km3 of meltwater and an associated lowering of the BIL by ~25 m. This event occurred at ~11,500 calibrated 14C yr, determined using bio-, litho, and chrono-stratigraphic data from numerous lake and bog cores in the immediate vicinity of Mt Billingen and the varve chronology from the Baltic Sea tied to the GRIP 18O record.

The dramatic fall in the level of the BIL is recorded by raised shorelines, isolation of lake basins, and changes in the characteristics of marine sediments. We collected material for a pilot study from (1) scoured bedrock directly in the path of the meltwater outflow, (2) large (> 2m x 2m x 2m) sandstone boulders derived from the northern tip of Mt Billingen and transported by the flood, (3) bedrock from a meltwater-scoured area further down-current (called Klyftamon), and (4) cobbles from the surface of thick floodwater deposits downstream of the scoured Klyftamon bedrock surface. The results of 10Be analysis of these samples

are internally consistent between the sampling locations, and we compare these to the available 14C data in order to assess the validity of the site as a potential calibration site for cosmogenic nuclide methods

Place, publisher, year, edition, pages
2007.
Identifiers
URN: urn:nbn:se:su:diva-21107OAI: oai:DiVA.org:su-21107DiVA: diva2:187633
Available from: 2007-12-06 Created: 2007-12-06Bibliographically approved

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