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The Saint-Honoré carbonatite REE zone, Québec, Canada: combined magmatic and hydrothermal processes

Néron Alexandre, Bédard L. Paul et Gaboury Damien. (2018). The Saint-Honoré carbonatite REE zone, Québec, Canada: combined magmatic and hydrothermal processes. Minerals, 8, (9), p. 397-416.

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URL officielle: https://doi.org/10.3390/min8090397

Résumé

The Saint-Honoré carbonatite complex hosts a rare earth element (REE) deposit traditionally interpreted as being produced by late-stage hydrothermal fluids that leached REE from apatite or dolomite found in the early units and concentrated the REE in the late-stage units. New evidence from deeper units suggest that the Fe-carbonatite was mineralized by a combination of both magmatic and hydrothermal crystallization of rare earth minerals. The upper Fe-carbonatite has characteristics typical of hydrothermal mineralization—polycrystalline clusters hosting bastnäsite-(Ce), which crystallized radially from carbonate or barite crystals, as well as the presence of halite and silicification within strongly brecciated units. However, bastnäsite-(Ce) inclusions in primary magmatic barite crystals have also been identified deeper in the Fe-carbonatite (below 1000 m), suggesting that primary crystallization of rare earth minerals occurred prior to hydrothermal leaching. Based on the intensity of hydrothermal brecciation, Cl depletion at depth and greater abundance of secondary fluid inclusions in carbonates in the upper levels, it is interpreted that hydrothermal activity was weaker in this deepest portion, thereby preserving the original magmatic textures. This early magmatic crystallization of rare earth minerals could be a significant factor in generating high-volume REE deposits. Crystallization of primary barite could be an important guide for REE exploration.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:8
Numéro:9
Pages:p. 397-416
Version évaluée par les pairs:Oui
Date:2018
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:carbonatite, rare earth elements, REE, deposit, hydrothermal, magmatic, éléments de terres rares, gisement, hydrothermal, magmatique
Déposé le:11 sept. 2018 02:02
Dernière modification:11 sept. 2018 02:02
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