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Ice-wedge pseudomorphs and frost-cracking structures in Weichselian sediments, Central-West Poland

The Permafrost Young Researchers Network (PYRN). Special issue

Auteur(s) et Affiliation(s)

Inst. of Geoecology and Geoinformation, Adam Mickiewicz Univ., Poznań, Pologne
LEWKOWICZ, A.
Univ., Ottawa, Canada


Description :
Wedge-shaped structures are described from three sites in the central Wielkopolska region (central-west Poland) in two main positions: (1) within fluvioglacial deposits below the Weichselian subglacial till and (2) within recessional deposits above this subglacial till. The wedges are interpreted as ice-wedge pseudomorphs (Rensko site), relict frost cracks (Tomice site) and thermokarst-affected ice-wedge pseudomorphs (Annowo-Kiszkowo area). It is suggested that the development of ice wedges was influenced by wet conditions in former depressions between ice-cored ridges or by large amounts of meltwater in the proglacial environment. These periglacial features support previous hypotheses that climatic conditions in the Wielkopolska region after the last ice-sheet recession changed gradually from glacial to periglacial.


Type de document :
Article de monographie

Source :
Permafrost and periglacial processes, issn : 1045-6740, 2009, vol. 20, n°. 4, p. 316-330, nombre de pages : 15, Références bibliographiques : 1 p.

Date :
2009

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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