Articles | Volume 36, issue 1
https://doi.org/10.5194/ejm-36-225-2024
© Author(s) 2024. 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-36-225-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
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21 Feb 2024
Research article | Highlight paper |
| 21 Feb 2024
| 21 Feb 2024
Granite magmatism and mantle filiation
Michel Pichavant
CORRESPONDING AUTHOR
Institut des Sciences de la Terre d'Orléans, UMR 7327, Univ Orleans, CNRS, BRGM, OSUC, 45071 Orléans, France
Arnaud Villaros
Institut des Sciences de la Terre d'Orléans, UMR 7327, Univ Orleans, CNRS, BRGM, OSUC, 45071 Orléans, France
Julie A.-S. Michaud
Institut für Mineralogie, Leibniz Universität Hannover, Callinstr. 3, 30167 Hanover, Germany
Bruno Scaillet
Institut des Sciences de la Terre d'Orléans, UMR 7327, Univ Orleans, CNRS, BRGM, OSUC, 45071 Orléans, France
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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.
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Boron and its isotopes, 11B and 10B, can track magmatic–hydrothermal processes, but this requires knowing how the isotopes fractionate between melt and fluid, which depends on B coordination. This is known for aqueous fluids but not for silicate melts. We determined B coordination by nuclear magnetic resonance in granitic glass with variable water content and alkali–alumina ratios. The results provide a way to estimate B coordination and melt–fluid fractionation for variable melt compositions.
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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
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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.
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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.
Models for the generation of silicic magmas are divided into two groups: intra-crustal melting...
