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Evidence for a Saline Component at Shallow Depth in the Crystalline Armorican Basement (W France)

Luc Aquilina 1, * Antoine Armandine Les Landes 1 Virginie Ayraud-Vergnaud 1 Thierry Labasque 1 Clément Roques 1 Philippe Davy 1 Hélène Pauwels 2 Emmanuelle Petelet-Giraud 2 
* Corresponding author
1 GR - Géosciences Rennes
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
Abstract : Saline fluids at shallow depth (50 - 450 m) in the Armorican basement were investigated. Fluids with salinities ranging from 80 to 900 mg/L mix with modern shallow groundwaters containing anthropogenic solutes. The most saline fluids are deeper or more isolated from mixing. These fluids reveal Br/Cl and SO4/Cl ratios that are typically marine. This work establishes the migration and the preservation of a marine end-member in a basement aquifer, and may provide keys for the understanding of such fluid circulation.
Keywords : Saline fluids Cristalline rocks Groundwaters Geochemistry
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Conference papers
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https://hal-insu.archives-ouvertes.fr/insu-00853165
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Submitted on : Thursday, August 22, 2013 - 9:46:18 AM
Last modification on : Tuesday, August 2, 2022 - 4:16:27 PM

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Luc Aquilina, Antoine Armandine Les Landes, Virginie Ayraud-Vergnaud, Thierry Labasque, Clément Roques, et al.. Evidence for a Saline Component at Shallow Depth in the Crystalline Armorican Basement (W France). Fourteenth International Symposium on Water-Rock Interaction, WRI 14, Jun 2013, Avignon, France. pp.19-22, ⟨10.1016/j.proeps.2013.03.157⟩. ⟨insu-00853165⟩

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