OSL chronology for a sediment core from the southern Baltic Sea: A continuous sedimentation record since deglaciation

A chronology based on optically stimulated luminescence (OSL) dating is presented for the late- and post-glacial evolution of the southern Baltic Sea (-15ka to present). During this period, large water level and salinity changes occurred in the Baltic Basin due to opening and closing of connections...

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Bibliographic Details
Published in:Quaternary Geochronology
Main Authors: Kortekaas, Marloes, Murray, A. S., Sandgren, Per, Björck, Svante
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2007
Subjects:
Geology
marine sediment
radiocarbon dating
optical dating
OSL
Baltic sea
sea-level changes
North Atlantic
Online Access:https://lup.lub.lu.se/record/648673
https://doi.org/10.1016/j.quageo.2006.05.036
Description
Summary:A chronology based on optically stimulated luminescence (OSL) dating is presented for the late- and post-glacial evolution of the southern Baltic Sea (-15ka to present). During this period, large water level and salinity changes occurred in the Baltic Basin due to opening and closing of connections to the North Atlantic. Previous attempts to establish a chronology for these palaeoenvironmental changes have mainly been conducted in coastal settings where organic material for C-14 dating is abundant. Many of these records are, however, discontinuous due to the large water level fluctuations. In contrast, in the relatively deep water of the Arkona Basin, the sediment record is expected to be more or less continuous. The single aliquot regenerative dose (SAR) procedure was used to date 32 samples of fine quartz sand from a 10.86 in long sediment core from the centre of this basin (45 in water depth). Tests of luminescence characteristics confirmed the suitability of the material for OSL dating and the ages agree well with the available AMS C-14 ages on shells. The Baltic Ice Lake drainage to the North Atlantic appears to occur - 11.6 ka, agreeing with other published evidence. However, we suggest that the main marine Littorina transgression appears in the Arkona Basin at about 6.5 ka, rather than at 8.5 ka, as previously thought. (c) 2006 Elsevier Ltd. All rights reserved.

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