Periglacial paleohydrologies reconstituted from sandstone morphologies

• Main Authors: Thiry, Médard, Milnes, Anthony, Grimaud, Jean-Louis
• Other Authors: Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris Sciences et Lettres (PSL), University of Adelaide, Centre de Géosciences (GEOSCIENCES), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)
• Format: Other/Unknown Material
• Language: English
• Published: HAL CCSD 2024
• Subjects: sandstone; morphology; groundwater; paleohydrology; proxy; periglacial; permafrost; Grès de Fontainebleau; morphologies; paléohydrologie; paléoenvironnement; périglaciaire; pergélisol; [SDE]Environmental Sciences
• Online Access: https://hal.science/hal-04545306; https://hal.science/hal-04545306/document; https://hal.science/hal-04545306/file/Thiry%26al_2024_Permafrost_Paleohydrology_Sable_Fontainebleau_field-trip_AstroGeo_240411.pdf

A model for groundwater silicification within the Fontainebleau Sands in sub contemporary landscapes was first proposed 35 years ago and has now been substantially updated with reference to silica precipitation during periglacial climate conditions. Herein we focus on observations that point to a deep permafrost which controlled the hydrology of paleolandscapes in the Paris Basin during Quaternary glaciations. A model for groundwater silicification within the Fontainebleau Sands in sub contemporary landscapes was first proposed 35 years ago and has now been substantially updated with reference to silica precipitation during periglacial climate conditions. Herein we focus on observations that point to a deep permafrost which controlled the hydrology of paleolandscapes in the Paris Basin during Quaternary glaciations. Le modèle d’une silicification de nappe, liée aux paysages subactuels, proposé il y a 35 ans, a été précisé et complété avec l’introduction des climats périglaciaires qui expliquent la précipitation de la silice. Ici nous présentons les observations qui étayent la présence d’un pergélisol (ou permafrost) profond dans le bassin de Paris pendant les glaciations quaternaires et qui permettent de remontrer à l’hydrologie de ces paléopaysages.