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- volume 13 (2010)
- number 1-2
- Periglacial deposits and correlated processes in the Ninglinspo Valley (Ardenne massif, Belgium)
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Periglacial deposits and correlated processes in the Ninglinspo Valley (Ardenne massif, Belgium)
Abstract
Located in the northern part of the Ardenne massif, the Ninglinspo catchment shows morphologic features (valley floor benches, slope dissymmetry, river superimposition, etc) which constitute the likely heritage of periglacial processes. Here, we consider chiefly the geomorphic meaning of the valley floor benches. Assuming that bench deposits resulted at least partially from periglacial processes during the last glacial means that, during the Holocene warming, the river was not able to evacuate them totally. Reasoning in the same way for previous glacial and interglacial episodes (e.g. with a river unable to transport during warm periods the entirety of the materials provided by periglacial slope processes), implies that a polygenic genesis of these benches should be considered. In this study, we try to bring to the fore this polygenic origin using different various techniques, including geophysical surveying and tephrochronology. Finally, catchment denudation rates by periglacial slope processes ranging from 0,45 to 2 mm/ka have been inferred since the last glacial.
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A propos de : Gilles RIXHON
Université de Liège, Département de Géographie, Sart-Tilman, Bâtiment B11, 4000 Liège FRS-FNRS, Belgium
A propos de : Etienne JUVIGNE
Université de Liège, Département de Géographie, Sart-Tilman, Bâtiment B11, 4000 Liège