Title
Opaline concretions in Weichselian Late-glacial lake marl from Flanders, northern Belgium
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Dordrecht ,
Subject
Physics
Chemistry
Biology
Source (journal)
Journal of paleolimnology. - Dordrecht
Volume/pages
20(1998) :1 , p. 91-98
ISSN
0921-2728
ISI
000074959700007
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Macroscopic opal-A concretions were observed in lake marl deposited in a small Flemish lake (Belgium) during the Allerod 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 Allerod.
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