Lateglacial environmental changes recorded in calcareous gyttja deposits at Gulickshof, southern Netherlands |
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| Authors: | WIM Z HOEK SJOERD J P BOHNCKE GERALD M GANSSEN TOM MEIJER |
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| Institution: | Wim Z. Hoek &Sjoerd J. P. Bohncke, The Netherlands Centre for Geo-ecological Research (ICG), Faculty of Earth Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, NL-1081 HV, Amsterdam, The Netherlands. E-mail;Gerald M. Ganssen, The Netherlands Research School for Sedimentary Geology (NSG), Faculty of Earth Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands;Tom Meijer, Netherlands Institute of Applied Geoscience TNO/National Geological Survey, PO Box 157, NL-2000 AD Haarlem, The Netherlands |
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| Abstract: | Environmental changes were reconstructed from Lateglacial calcareous gyttja deposits at Gulickshof, southern Netherlands. Analyses of pollen, fresh-water mollusca, stable isotopes and geo-chemistry were performed and the combined evidence was put into a chronostratigraphic framework based on regional biostratigraphy and accelerator mass spectrometry radiocarbon dating. The pollen diagram showed vegetation development from the Bφlling interstadial into the Late Dryas stadial within 2.9 m of lacustrine deposits. Early in the Allerφd, around 11 900 BP, the composition of aquatic taxa and stable isotopes of calcium carbonate changed significantly. It appears that the final melting of relic ground-ice and subsequent re-establishment of the hydrological cell early in the Allerφd were responsible for these changes. Later in the Allerφd, around 11 250 BP, the disappearance of molluscs, changes in vegetation and isotope composition all point to colder climate conditions attributable to the Gerzensee oscillation. The combination of different lines of evidence in these types of deposits proves to be an excellent tool for unravelling climate and environmental signals. |
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