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Origine, âge et processus physico-chimiques des circulations de fluides dans les fractures : exemple de socle sous couverture (Vienne) et de formations riches en argiles (Gard, Est)

Abstract : The study of minerals sealing the discontinuities and the cavities by past to recent fluid circulations is the only method to assess the paleo -hydrological and -hydrogeochemical behavior of both sedimentary or granitic systems. Petrographic, mineralogic, isotopic and geochemical tools provide the opportunity to identify the source and the nature of sealing-forming waters and to precise the physical and chemical mechanisms occurring during fluid circulations. This study is focused on 3 sites selected in the framework of a survey managed by ANDRA for the feasibility of an underground laboratory (plutonites of Vienne, Cretaceous siltites of Marcoule, argillites in the Eastern part of the Paris basin). Our methodology, based on the combined use of C-O isotopic tracers, petrographic, mineralogical and thermal (fluid inclusion, organic matter, clay typology) studies, is a promising powerful tool to assess the paleo-hydrogeologic behavior in geological systems.
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https://hal.univ-lorraine.fr/tel-01748372
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Stéphane Buschaert. Origine, âge et processus physico-chimiques des circulations de fluides dans les fractures : exemple de socle sous couverture (Vienne) et de formations riches en argiles (Gard, Est). Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10233⟩. ⟨tel-01748372⟩

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