Specific erosional and depositional processes in a Pleistocene subglacial tunnel in the Wielkopolska region, Poland

Auteur(s) et Affiliation(s)



Description :
The study area is located in the mid-Polish Lowland and is characterized by depositional forms of Weichselian age. The Pleistocene Cieśle succession accumulated in a subglacial tunnel and shows three sedimentological units. The AA. focus on angular and deformed sandy clasts that occur in the second unit. It appears that thermal erosion, short transport in a sediment-laden current and sudden sedimentation were responsible for the oversized sandy clasts that occur in the gravel glaciofluvial deposits. The deposits are characterized by large-scale erosional scours, massive structure, and fluid-escape deformations. This combination of features can be used as a key tool for the interpretation of hyperconcentrated-flow conditions beneath Pleistocene ice sheets.


Type de document :
Article de périodique

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2012, vol. 94, n°. 3, p. 429-443, nombre de pages : 15, Références bibliographiques : 3 p.

Date :
2012

Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi