La Meuse, un enregisteur de l’évolution tectonique récente du front varisque

The Meuse river, recording recent tectonic evolution of the Variscan front
B. Van Vliet Lanoë, F. Lacquement, L. Voisin, J.L. Mansy, F. Meilliez
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The mapping of the deposits and terraces of the Meuse river were reanalysed in there geodynamical context. This work has been completed by the analysis of a DEM. The problem of the capture of the "Meuse ardennaise" and the "Meuse lorraine" by the Condroz Meuse is discussed. Two sets of deposits were observed between Charleville-Mézières and Givet, 1) an older one covering the Eocene to the Late Miocene characterized by a local origin of the sediments and 2) a younger one, reworking material from the Paris Basin and from the Vosges, covering the middle Pliocene to the Holocene. Below the "Middle terrace" deposits in several locations, we observed a late Miocene deposit. This means that the Ardenne Meuse was already deeply incised prior to Quaternary. The capture occurred at the level of the Maisoncel fault, with a drainage reversal. Terraces and deposits were correlated with dated elements. The Pliocene valley was filled up before being re-incised during the Quaternary. This clearly showed the impact on long wavelength deformations on the terrace incision, though deposits occurred mostly during relaxation events. These successive deformations led to a pulsated moderate uplift of the Western Ardenne by reactivation of the Variscan structures.

Key words: Tertiary, Quaternary, Terraces, Uplift, Neotectonics, Belgium, Ardennes France, Meuse Valley

Dernière mise à jour le 30.06.2015