Articles | Volume 38, issue 5
https://doi.org/10.5194/ejm-38-635-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-635-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Oct 2026
Research article |
| 20 Oct 2026
| 20 Oct 2026
Experimental constraints on the stability of Mg-rich tourmaline and the boron concentration of hydrothermal fluids
Julien Fort
Institut des Sciences de la Terre d'Orléans (ISTO), UMR 7327, Université d'Orléans, CNRS, BRGM, 45071 Orléans, France
Stanislas Sizaret
CORRESPONDING AUTHOR
Institut des Sciences de la Terre d'Orléans (ISTO), UMR 7327, Université d'Orléans, CNRS, BRGM, 45071 Orléans, France
Michel Pichavant
Institut des Sciences de la Terre d'Orléans (ISTO), UMR 7327, Université d'Orléans, CNRS, BRGM, 45071 Orléans, France
Arnault Lassin
Institut des Sciences de la Terre d'Orléans (ISTO), UMR 7327, Université d'Orléans, CNRS, BRGM, 45071 Orléans, France
Bureau de Recherches Géologiques et Minières (BRGM), 45060 Orléans, France
Johann Tuduri
Bureau de Recherches Géologiques et Minières (BRGM), 45060 Orléans, France
Olivier Blein
Bureau de Recherches Géologiques et Minières (BRGM), 45060 Orléans, France
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Colin Fauguerolles, Teddy Castelain, Johan Villeneuve, and Michel Pichavant
Eur. J. Mineral., 36, 555–579, https://doi.org/10.5194/ejm-36-555-2024, https://doi.org/10.5194/ejm-36-555-2024, 2024
Short summary
Short summary
To explore the influence of the redox state of the environment on the serpentinization reaction, we have developed an original experimental setup. Reducing conditions, leading to the formation of serpentine and magnetite, and oxidizing conditions, leading to the formation of serpentine and hematite, are discussed in terms of analogues of low- and high-permeability hydrothermal systems, respectively. The influence of the redox on brucite stability and hydrogen production is also established.
Michel Pichavant, Arnaud Villaros, Julie A.-S. Michaud, and Bruno Scaillet
Eur. J. Mineral., 36, 225–246, https://doi.org/10.5194/ejm-36-225-2024, https://doi.org/10.5194/ejm-36-225-2024, 2024
Short summary
Short summary
Models for the generation of silicic magmas are divided into two groups: intra-crustal melting and basaltic origin. Peraluminous felsic leucogranites are considered as the only granite examples showing no mantle input. This interpretation is re-evaluated, and we show that leucogranites, as most other crustal granite types, can have a mantle filiation. This stresses the critical importance of the mantle for granite generation and opens the way for unification of silicic magma generation models.
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Short summary
This experimental study determines the minimum boron concentrations required to form tourmaline under hydrothermal conditions. Results show that temperature influences boron thresholds going from 2 wt % at 400 °C to 3.4 wt % B2O3 at 600 °C. Thermodynamic models are able to reproduce the same behavior, but the values show a mismatch if not refined to account for the chemistry of the experimental results. Those new constrains are of great help in predicting natural fluid–rock interactions and ore deposit formation.
This experimental study determines the minimum boron concentrations required to form tourmaline...
