Les paléokarsts et les formations ferrugineuses associées dans le Bassin Parisien et ses bordures : caractérisations et évolutions géomorphologiques

Abstract : That's on the board of the Parisian Basin and its surrounding, and more particularly on the Jurassic as well as the cretaceous subterrane, we can find some paleokarsts fossilized. More of 60 underground or aerial sites have been studied in the South of the Ardenne, from the Thiérache ardennaise to the Pays-Haut ; on the contact of the Jurassic- Cretaceous to the limits of the Lorraine and the Champagne (Vallage, Barrois and Haut- Pays) ; to the North of the Massif Central, from the Champagne berrichonne to the Montmorillonnais ; on the chalky trays of Normandy (Pays d?Ouche, Plaine de Saint- André) ; at the hinge between bressan and rhenan Graben (fossé de la petite Saône, Plateaux de Vesoul, Collines pré-jurassiennes). Analyses made on 250 samples (macroscopic and microscopic analysis, granulometry and morphoscopy, mineralogical and chemical analyses), have shown that these iron cementation present facies extremely varied on both structure and size. These facies can result, either in a dominant mechanical revision, or in a chemical revision dominating perhaps exclusive, or in allying both chemical or mechanical reworking. The stemming ferruginous deposits coming from the ferricrusts generated during the periods of ferralitic alteration having affected the Western Europe between the inferior Cretaceous and the beginning of the Tertiary, have evolved according to the collection of valleys during the Plio-Quaternary. Consequently the karst is generator of specific facies and contributes to amplify chemical or mechanical revision processes.
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Jean-Paul Fizaine. Les paléokarsts et les formations ferrugineuses associées dans le Bassin Parisien et ses bordures : caractérisations et évolutions géomorphologiques. Histoire. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0179⟩. ⟨tel-01749252⟩

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