Early Holocene history of the Baltic Sea, as reflected in coastal sediments in Blekinge, southeastern Sweden |
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Authors: | Bjrn E Berglund Per Sandgren Lena Barnekow Gina Hannon Hui Jiang Gran Skog Shi-Yong Yu |
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Institution: | a Department of Geology, Quaternary Geology, Lund University, Sölvegatan 12, SE-223 62, Lund, Sweden;b Swedish University of Agricultural Sciences, Box 49, SE-230 52, Alnarp, Sweden;c Department of Earth Sciences, University of Aarhus, C.F. Møllers Allé 120, DK-8000, Aarhus, Denmark and Laboratory of Geographic Information Science, East China Normal University, Shanghai 200062, PR China |
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Abstract: | Integrated palaeoecological studies of two fiord sediment sequences in the province of Blekinge, SE Sweden, covering the time span 11,000–5000 cal BP, reveal the timing and the environment for the Ancylus Lake/Littorina Sea transition 9800–8500 cal BP. The first ingression of saline water into the Baltic Sea through the Danish Straits occurred earlier than formerly assumed. New evidence, particularly mineral magnetic and palaeobotanical analyses, demonstrate that on the general trend of the eustatically caused Littorina transgression several minor fluctuations of the water level can be identified between 8500 and 5000 cal years BP. A distinct regression phase around 8100 cal BP is correlated with the Greenland ice-core cold event dated to 8200 ice-core years BP. This is described as a regional climatic catastrophe for the Baltic Sea region. The coastal stratigraphy is compared with the offshore stratigraphy earlier studied. A tentative shore displacement curve for Early and Middle Holocene is presented. |
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Keywords: | Holocene Yoldia Sea Ancylus Lake Littorina Sea Mineral magnetism Pollen Plant macrofossils Diatoms Southern Sweden Shore displacement Littorina transgression Eustasy Climate changes |
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