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The uranium metallogeny in the South Armorican detachment zones, Variscan belt, France: geology, tracing (in space and time), numerical modelling

Philippe Boulvais 1 Seconde Ntiharirizwa 1 Marc Poujol 1 Yannick Branquet 1, 2, 3, 4 Nathan Cogné 1 Thibault Duretz 1 Christophe Ballouard 5 Et Al.
1 GR - Géosciences Rennes
2 Rainbow Rare Earths
3 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
4 Métallogénie - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
5 UJ - University of Johannesburg
Abstract : Uranium mineralization is common in geological environments where oxidized uranium bearing fluids interact with reduced lithologies. This was the case for Variscan detachments in the South Armorican Massif, France. Numerous syn-tectonic peraluminous granites were emplaced in the footwall of detachments during the Carboniferous. Surface-derived fluids infiltrated the detachment planes and leached out the uranium from the magmatic uraninite that crystallized in these granites at the end of magmatic differentiation. On their way back to the surface, these fluids interacted with reducing black schists, which triggered precipitation of hydrothermal uraninite. This conceptual model serves as a basis for thermal hydraulic-mechanical modeling.
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Conference papers
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https://hal-insu.archives-ouvertes.fr/insu-02442475
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, January 16, 2020 - 2:42:39 PM
Last modification on : Sunday, October 18, 2020 - 2:58:01 PM

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  • HAL Id : insu-02442475, version 1

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Philippe Boulvais, Seconde Ntiharirizwa, Marc Poujol, Yannick Branquet, Nathan Cogné, et al.. The uranium metallogeny in the South Armorican detachment zones, Variscan belt, France: geology, tracing (in space and time), numerical modelling. 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits, Aug 2019, Glasgow, United Kingdom. ⟨insu-02442475⟩

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