Mots-clés
Ardenne ; Belgique ; Hautes-Fagnes ; Héritage géomorphologique ; Météorisation ; Palse ; Paléo-environnement ; Pergélisol ; PériglaciaireArdenne ; Belgium ; Hautes-Fagnes ; Inheritated geomorphological features ; Palaeo-environment ; Palsa ; Periglacial features ; Permafrost ; WeatheringHerencia geomorfológica ; Meteorización ; Paleoambiente ; Palsa ; Pergelisol ; PeriglaciarRemnants of lithalsas on the Hautes Fagnes plateau (Belgium) are on weathered quartzitic rocks
Auteur :PISSART, A.
Description :
The ramparted depressions that exist on the Hautes Fagnes Plateau in Belgium, first interpreted in 1956 as the remnants of pingos are best explained as remnants of lithalsas (i.e., mineral palsas), formed from ice segregation within frozen ground (permafrost) of Younger Dryas age. Their location, above 500 m a.s.l. in Belgium, reflects the cold Younger-Dryas climate that have existed at that altitude but it was unclear why similar features did not form on the adjacent Eifel Plateau at the same altitude. The AA. demonstrate here that lithalsas were formed only on weathered quartzitic rocks of the Cambro-Ordovician massif of Stavelot, and probably are associated with local hydrological conditions.
Type de document :
Article de périodique
Source :
Zeitschrift für Geomorphologie, issn : 0372-8854, 2010, vol. 54, n°. 1, p. 1-15, nombre de pages : 15, Références bibliographiques : 28 ref.
Date :
2010
Editeur :
Pays édition : Allemagne, Stuttgart, Gebruder Borntraeger
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)