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Evolution des altérites du Crétacé supérieur à l'Eocène depuis la surface continentale vers l'endokarst Garrigues septentrionales du Gard et du sud Ardèche

Abstract : The purpose of this article is to characterize, only on a geochemical plan (major and minor elements and traces), the alteration processes and their consequences on the karsts of the northern scrublands of the Gard department and those of the southern Ardèche, where the caves have conserved sediment depositions of late Cretaceous and Paleogene times, coming from their surface. The protocol involves comparing the constituent elements of the grounds referenced on the geological maps with those found in various depressions and epikarstic ravins and hypogaea of the endokarst. This allows to assess the different chemical signatures and to link known geological criteria to samples, so far unprecedented. These samples have been taken on each side of a NE-SW axis between the Dent de Rez and the Mont Bouquet. Some have been extracted SW of Bagnols sur Cèze or in the Euzet region. The geochemical characterization of the alterites taken from the different stratigraphic sequences from the Lower Cretaceous to the Upper Eocene suggests that only the lower and middle Eocene alterites left their foot prints in the karst. From the study of , the origin of these alterital formations via ancient hydrographic systems, some traces of which are still visible, canbehighlighted It isalso possible to deducetheir contribution to the establishment of karst aquifer structures of the Barremo-Bédoulien.
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https://hal-emse.ccsd.cnrs.fr/emse-02964677
Contributor : Fatima Lillouch <>
Submitted on : Monday, October 12, 2020 - 4:04:47 PM
Last modification on : Tuesday, November 3, 2020 - 1:42:02 PM

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  • HAL Id : emse-02964677, version 1

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Joël Jolivet, Didier Graillot, Erik van den Broeck. Evolution des altérites du Crétacé supérieur à l'Eocène depuis la surface continentale vers l'endokarst Garrigues septentrionales du Gard et du sud Ardèche. Karstologia Mémoires, Association Française de Karstologie, 2020, pp.7 à 16. ⟨emse-02964677⟩

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