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Origine de la minéralisation des eaux dans un aquifère multicouche profond : exemple de la "zone minéralisée de l'Entre-Deux-Mers" (Bassin Aquitain, France)

Abstract : Geochemical and isotopic characterizations of groundwaters in the "mineralized Entre-Deux-Mers area" indicate a common origin of the mineralization, directly linked to the mineralogy of the formations abstracted by drilling.Geochemistry shows that water-rock interactions are mainly influenced by the presence of evaporites, and that but that other interactions involving carbonates, silicates and clays exist. A geochemical model based on the water geochemistry and mineralogy of the Tertiary formations of northern Aquitaine Basin fix waters in equilibrium with evaporitic and carbonated formations. This model reconstitutes perfectly the groundwaters’ chemistry across the study area and explains the mineralization acquisition. Improving the understanding of the lateral and vertical distribution of tertiary formations and their mineralogy requires a sedimentological and paleogeographical approach. This approach allowed to locate the different layers rich in sulphates and/or fluoride and to understand also their origin.Based on hydrogeology, paleogeography, mineralogy and geochemistry, the distribution of the mineralization has been tested at the borehole scale. The results of this coupled hydrodynamic-transport modeling reconstitute the chemistry of the groundwaters in the "mineralized Entre-Deux-Mers area." A model, that considers the sealing of sulphates- and fluorides-rich layers has been tested and its results highlights future research perspectives. This work has allowed understanding the origin of the mineralization of the waters "of the mineralized Entre-Deux-Mers area" and also suggests improvements and prospects for sustainable management of a major drinking water resource in Gironde.
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  • HAL Id : tel-00742951, version 2

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Eline Malcuit. Origine de la minéralisation des eaux dans un aquifère multicouche profond : exemple de la "zone minéralisée de l'Entre-Deux-Mers" (Bassin Aquitain, France). Sciences de la Terre. Université Michel de Montaigne - Bordeaux III, 2012. Français. ⟨NNT : 2012BOR30019⟩. ⟨tel-00742951v2⟩

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