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K. Kotzer, EPE44-6), des chlorites hydrothermales de première génération (triangle et losange noirs), des sudoïtes (sudoïte, triangle et losange gris), de phase de mélange à sudoïte-illite (losange et rond jaune) et de sudoïte inclues dans des oxydes de fer tardifs (losange rouge) pour certains échantillons étudiés) d'études précédentes ont été placées pour comparaison Valeurs calculées pour 14 oxygènes, Figure 3-25 : Diagramme Mg-Fe total montrant les caractéristiques cristallochimiques des chlorites rétrométamorphiques (rond noir, p.173, 1995.

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. Beaufort, EPE44-12), d'illites de la matrice illite-sudoïte d'échantillons de différents types d'altération (EPE44-2, EPE44-3, EPE44-6 et 1935-3), de kaolinite et de muscovite, Figure 3-27 : Diagramme Si-Fe+Mg montrant les caractéristiques cristallochimiques des illites d'échantillons très faiblement altérés, p.174, 2005.

.. Pechblende-en-croissance-autour-d, une galène partiellement altérée (Ga1) Des galènes automorphes secondaires (Ga2) tapissent les cavités minéralisées. F. Pechblende en remplissage de cavité de dissolution de quartz primaire (Qtz) avec coffinitisation postérieure (Cof), p.245

. Le-délitage-est-la-seconde-Étape, Il est pratiqué dans un erlenmeyer rempli d'eau distillée (ou osmosée) à l'aide d'un agitateur magnétique Dans le même temps, on pratique l'opération de décarbonatation de la roche (utilisation d'acide dilué à HCl N/5 sous contrôle du pH par un pHmètre) Le pH est constamment maintenu au dessus de 4. De même, l'agitation se poursuit pour éviter les surconcentrations locales, La décarbonatation est terminée quand le pH reste stable dans une zone autour de 4. On ajoute immédiatement de l'eau osmosée pour stopper l'attaque

L. 'étape-suivante-consiste-À-laver-la-roche-broyée-et-décarbonatée-de-l-'acide-excédentaire, Pour cela on centrifuge les solutions à 8000 tours/min pendant 20 min Après chaque centrifugation, l'eau surnageante est éliminée et le culot est remis en suspension dans l'eau distillée. On vérifie l'absence d'excès d'ions chlorure (ajout de quelques gouttes d'une solution de nitrate d'argent dilué AgNO 3 N/10) On répète ce cycle plusieurs fois (en général cinq fois) jusqu'à ce que l

. La-quatrième-Étape-est-la-décantation, ou sédimentation) de la roche après homogénéisation par passage aux ultrasons (dix minutes) La décantation est basée sur la loi de Stokes qui relie la vitesse de sédimentation à une durée en fonction de la densité de la particule et du diamètre de la particule. Le prélèvement des deux centimètres supérieurs de la suspension après

. La-spectroscopie-d, Inductively Coupled Plasma : ICP) permet de doser les éléments majeurs et traces dans les roches. Les analyses ont été effectuées au Service d'Analyse des Les limites de détection, élément par élément, peuvent être obtenus sur le site, Roches et Minéraux (SARM) du CRPG Internet du SARM

. Le-spectromètre-de-masse, ICP-MS) utilisé est un Perkin Elmer 5000 Les éléments traces mesurés sont : As