Opaline concretions in Weichselian Late-glacial lake marl from Flanders, northern Belgium |
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| Authors: | Luc Denys Patrick Kiden Cyriel Verbruggen |
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| Affiliation: | (1) Department of Biology (Arctic Ecology, Limnology and Paleobiology Unit), Universitair Centrum Antwerpen (RUCA(, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium;(2) Netherlands Institute of Applied Geoscience TNO - National Geological Survey, District Zuid, Vincent van Goghstraat 78, PO Box 35, NL-5670 AA Nuenen, The Netherlands;(3) Laboratory Regional Geography, Universiteit Gent, Krijgslaan 281, B-9000 Gent, Belgium |
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| Abstract: | Macroscopic opal-A concretions were observed in lake marl deposited in a small Flemish lake (Belgium) during the Allerød biozone of the Weichselian Late-glacial (ca. 12–11 ka BP). The silica from these concretions was derived within the profile, by the leaching of siliceous microfossils – mainly diatom frustules. Formation of the concretions probably resulted from pH- and/or evaporation related precipitation of the silica at a lower stratigraphic level, presumably corresponding more or less to a former low position of the groundwater table. The presence of these concretions is probably related to alternatingly wet and dry local conditions during the middle and later part of the Allerød. |
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| Keywords: | opal-A biogenic silica lake levels Allerø d Weichselian Late-glacial paleolimnology Belgium |
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