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Article dans une revue
AN UNUSUAL OCCURRENCE OF SYNCHYSITE-(Ce) IN AMYGDULES FROM THE ESTEREL VOLCANIC ROCKS, FRANCE: IMPLICATIONS FOR RARE-EARTH ELEMENT MOBILITY
Abstract : Certain basaltic flows of the Permian volcanism in the Esterel (France) are enriched at their top and bottom in amygdules containing various minerals. Some of these amygdules appear to be particularly enriched in synchysite-(Ce), developed as fibrous aggregates together with chlorite and calcite. The rare earth element (REE) distribution pattern in individual amygdules appears very similar to that of the host basalt, suggesting that during the basalt's late hydrothermal evolution the REE were coherently remobilized and reprecipitated in the amygdules in the form of REE minerals. In such an environment, enriched in carbonate and F, the most stable REE mineral to crystallize from the hydrothermal solution was synchysite-(Ce), whose REE pattern has strong similarities to the host basalt.
Keywords :
alteration
amygdules basalts
calcite
carbonates
chemical composition
chlorite
chlorite group
crystal chemistry
electron probe data
Esterel
Europe
fluorides
France
halides
hydrothermal conditions
igneous rocks
metals mobility
occurrence rare earths
sheet silicates
silicates
solutions
synchysite
Var
volcanic rocks
Western Europe
Reyran River basin
https://hal-brgm.archives-ouvertes.fr/hal-03670649
Contributeur : Frédérique COUFFIGNAL Connectez-vous pour contacter le contributeur
Soumis le : mardi 17 mai 2022 - 15:53:01
Dernière modification le : mercredi 3 août 2022 - 04:06:12
Contributeur : Frédérique COUFFIGNAL Connectez-vous pour contacter le contributeur
Soumis le : mardi 17 mai 2022 - 15:53:01
Dernière modification le : mercredi 3 août 2022 - 04:06:12