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Interactions eau-fer-argilite : rôle des paramètres liquide/roche, fer/argilite, température sur la nature des phases minérales

Abstract : The interactions between the iron metal and the argillite from the Callovo-Oxfordian formation chosen as host for the disposal of the radioactive wastes, was experimentally studied. The role of the key parameters of the transformations (iron / clay, and liquid / rock ratios) was studied at 90°C, and, to accelerate reaction kinetics, at 150°C and 300°C. Mixed layered illite-smectite and illites are dissolved and replaced by new clay phases. TEM analyses show that Fe-serpentines (7 Å phases, group of the berthierine) predominates in run products at 90°C, tri-octaedral Fe-rich smectites at 150°C, and chlorites and probably smectite chlorite mixed layered at 300°C. Whatever the temperature, the illite and I/S replacement is not complete and trun products are always accompanied by sodi-calcic residual and/ or newly formed smectites. In comparison with the iron-smectite (bentonite) system, the differences concern the reaction kinetics which are much faster in the case of the argillite, and the instability of the quartz which, as the illite, contributes to release the silicium necessary for the formation of iron silicates. The observed process find analogies with the hydrothermal changes described in natural hydrothermal alterations and Fe-Mg metasomatism
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Olivier Pierron. Interactions eau-fer-argilite : rôle des paramètres liquide/roche, fer/argilite, température sur la nature des phases minérales. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10146⟩. ⟨tel-01746305⟩

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