Stratigraphy of organic-rich deposits in floodplain environments: examples from the upper Odra River basin
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Date
2012
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Wydział Nauk Geograficznych i Geologicznych UAM
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Abstract
Macrofossil analysis and radiocarbon dating were used to determine the age, composition and succession
pattern of organic-rich deposits infilling oxbows and flood basins in the Rivers Kłodnica, Odra and Osobłoga
valleys (southern Poland). Both detrital sediments representing the aquatic or terrestrial environments as well
as five types of peat accumulated in amphibious or peatland conditions have been identified in cores analyzed.
Studies have shown that an accumulation of organic-rich deposits was commonly initiated by terrestrialisation
and was typically occurred under eutrophic conditions. In such circumstances, deposit sequences usually begin
with aquatic detrital sediment (gyttja), or possibly brown-moss or reed peat. These deposits normally pass into
sedge-reed peat and then alder peat. If the accumulation of organic-rich deposits was initiated by paludification,
alder peat appears in the lowest sections of the fens. In the upper parts of the sequences, apart from wood peat,
organic deposits dominated by sedge remains are also present. The latter were accumulated, probably, as an
indirect effect of human activities in the floodplains.
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Keywords
macrofossils, organic matter, detritus deposits, peat, Holocene
Citation
Quaestiones Geographicae vol. 31 (3), 2012, s. 107-117
ISBN
978-83-62662-62-3