Depositional conditions on an alluvial fan at the turn of the Weichselian to the Holocene – a case study in the Żmigród Basin, southwest Poland

• Published in: Geologos
• Main Authors: Zieliński Paweł, Sokołowski Robert J., Fedorowicz Stanisław, Woronko Barbara, Hołub Beata, Jankowski Michał, Kuc Michał, Tracz Michał
• Format: Article in Journal/Newspaper
• Language: English
• Published: Sciendo 2016
• Subjects: climate change; periglacial environment; fluvial processes; aeolian processes; luminescence dating; Geology; QE1-996.5; permafrost
• Online Access: https://doi.org/10.1515/logos-2016-0012; https://doaj.org/article/190944c1c8bf45799e16b80658dd0a84

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 succession identified: 1) the lower unit was deposited during the Pleni-Weichselian within a sand-bed braided river functioning 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.