Response to the discussion by Van Vliet-Lanoë et al. of the paper ‘Features caused by ground ice growth and decay in Late Pleistocene fluvial deposits, Paris Basin, France’ (Bertran et al., 2018, Geomorphology 310, 84–101)

• Published in: Geomorphology
• Main Authors: Bertran, Pascal, Andrieux, Eric, Bateman, Mark, D, Font, Marianne, Manchuel, Kevin, Sicilia, Deborah
• Other Authors: Institut national de recherches archéologiques préventives (Inrap), De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie (PACEA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), University of Sheffield Sheffield, Department of Geography Sheffield, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU), EDF (EDF)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: Last Glacial permafrost; Thermokarst lakes; Paris Basin; Faulting; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology; Ice; permafrost; Thermokarst; wedge*
• Online Access: https://normandie-univ.hal.science/hal-01891827; https://doi.org/10.1016/j.geomorph.2018.09.016

(IF 3.82; Q1) International audience The response by Van Vliet-Lanoë et al. to our paper on potential thermokarst features in Pleistocene alluvial deposits from the Paris Basin (France) presents inconsistencies that we consider here successively. These are (1) the map of the maximum extent of Pleistocene permafrost in France, (2) the genesis of liquefaction and fluidization structures in periglacial environments, (3) the origin of thermokarst lakes and recumbent folds, (4) the depositional context of sandy units, and (5) the age of the studied deposits. All structures result from the interplay between (1) the growth and degradation of ice wedges, which are responsible for the development of a mound-like topography (badland thermokarst reliefs) on the edge of the alluvial terrace and from the initiation of ponding elsewhere on the terrace, (2) the degradation of lithalsa that developed later in the lacustrine deposits. The sequence was dated confidently to the Late Weichselian.