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Géochimie isotopique des eaux des formations argileuses et calcaires du site Andra de Meuse/Haute-Marne

Abstract : The radioactive waste geological storage research is conducted, in France, in Callovo-Oxfordian argillites (Eastern Paris Basin). The origin and the story of the water present in this low permeable clayrock is a major problem since it is the vector of radioactivity towards biosphere. Different geochemical tracers (ΔD, Δ18O, 87Sr/86Sr and noble gas contents) are used here to understand the origin and the story of the pore water. The main difficulty lies in the impossibility to extract water, having made necessary the elaboration of rigorous analytical protocols. The obtained results are confronted with geochemical analysis of the groundwaters of the limestones formations surrounding the argillites. Waters origins and interactions with rocks that they are or were in contact constitute the interest of this work. The analysis of the argillites texture by gas adsorption allow besides studying their porosity, their adsorption capacity as well as their behavior to hydration.
The argillite pore waters appear to be of meteoric origin, significant that sea waters originally present were replaced by meteoric waters. The groundwaters of the two limestone formations surrounding the argillites present distinct geochemical signatures, revealing the role of screen played by the impermeable argillite layer.
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  • HAL Id : tel-00204775, version 1

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Sophie Giannesini. Géochimie isotopique des eaux des formations argileuses et calcaires du site Andra de Meuse/Haute-Marne. Géochimie. Université Paul Cézanne Aix-Marseille III, 2006. Français. ⟨tel-00204775⟩

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