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Provenance and paleoenvironmental context of the Late Pleistocene thin aeolian silt mantles in southwestern Poland – A widespread parent material for soils
Authors
Yulia V. Erban Kochergina
Manfred Frechen
+11 more
Zdzisław Jary
Cezary Kabała
Aleksandra Kot
Marcin Krawczyk
Simon Meyer-Heintze
Anna Pietranik
Bernhard Schultz
Tobias Sprafke
Sumiko Tsukamoto
Jaroslaw Waroszewski
Beata Łabaz
Publication date
1 January 2021
Publisher
New York, NY [u.a.] : Elsevier
Doi
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Abstract
Thin loess deposits are widespread soil parent materials and important archives for paleoenvironmental reconstruction. The origin of loess in SW Poland is attributed to the Great Odra Valley (GOV), following the general concept that large rivers play a major role in regional silt supply. Yet, the precise provenance (glacier sources and/or local rocks) of silts, possibly deflated from dry GOV braided riverbeds, is not clear. Our study of thin and thick loess mantles in SW Poland for the first time indicates the provenance of thin loess based on mineralogical (MLA-SEM) and isotopic analyses (143Nd/144Nd, 87Sr/86Sr). Luminescence ages of five localities point to thin loess mantle formation during and shortly (23.0 to 17.7 ka yr) after the Last Glacial Maximum (LGM). Our isotopic data indicate that thin loess deposits in SW Poland are the mixtures of two main components – local Sudetic and Scandinavian, the latter delivered by the Fennoscandian ice sheet (FIS). Also, detailed analyses of heavy minerals show that a single mineral (e.g., hornblende) may come from both Sudetic and Scandinavian sources. This research highlights the role of the (Pleistocene) GOV in collecting and homogenizing materials, while supplying the region with fine particles to be deflated by paleowinds from open surfaces. Anomalies in mineralogy and isotopic composition are connected with influence of Sudetic mountain rivers and locally blowing silt material by katabatic winds. Regional grain size differentiation of thin loess mantles explains transport distance and altitude. © 2021 The Author
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Repositorium für Naturwissenschaften und Technik
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oai:oa.tib.eu:123456789/8382
Last time updated on 23/07/2022
Bern Open Repository and Information System (BORIS)
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