Depositional conditions on an alluvial fan at the turn of the Weichselian to the Holocene – a case study in the Żmigród Basin, southwest Poland
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Date
2016-08
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Publisher
Instytut Geologii UAM
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Abstract
Presented are the results of research into the fluvio-aeolian sedimentary succession at the site of Postolin in the Żmigród
Basin, southwest Poland. Based on lithofacies analysis, textural analysis, Thermoluminescence and Infrared-Optical
Stimulated Luminescence dating and GIS analysis, three lithofacies units were recognised and their stratigraphic suc-
cession identified: 1) the lower unit was deposited during the Pleni-Weichselian within a sand-bed braided river fun-
ctioning under permafrost conditions within the central part of the alluvial fan; 2) the middle unit is the result of aeolian
deposition and fluvial redeposition on the surface of the fan during long-term permafrost and progressive decrease of
humidity of the climate at the turn of the Pleni- to the Late Weichselian; 3) the upper unit accumulated following the
development of longitudinal dunes at the turn of the Late Weichselian to the Holocene; the development of dunes was
interrupted twice by the form being stabilised by vegetation and soil development.
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Keywords
climate change, periglacial environment, fluvial processes, aeolian processes, luminescence dating
Citation
Geologos, 2016, 22, 2,pp.105-120
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ISBN
ISBN 978-83-232187-4-6
ISSN
ISSN 1426-8981