Articles | Volume 38, issue 4
https://doi.org/10.5194/ejm-38-477-2026
© 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-38-477-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Preservation of water concentration in mantle xenoliths: a case study from Allègre and Ray Pic volcanoes (French Massif Central)
Konstantinos Thomaidis
CORRESPONDING AUTHOR
Univ. Lille, CNRS, INRAE, Central Lille, UMR 8207, UMET – Unité Matériaux et Transformations, 59000 Lille, France
Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Jannick Ingrin
CORRESPONDING AUTHOR
Univ. Lille, CNRS, INRAE, Central Lille, UMR 8207, UMET – Unité Matériaux et Transformations, 59000 Lille, France
Etienne Deloule
Université de Lorraine, CNRS, CRPG, 54000 Nancy, France
Lydéric France
Université de Lorraine, CNRS, CRPG, 54000 Nancy, France
Institut Universitaire de France (IUF), 75231 Paris, France
Huan Chen
College of Oceanography, Hohai University, Nanjing 210098, China
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Eur. J. Mineral., 38, 103–116, https://doi.org/10.5194/ejm-38-103-2026, https://doi.org/10.5194/ejm-38-103-2026, 2026
Short summary
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Interactions between minerals and water are fundamental to many geological processes on Earth, in meteorites, and on other planetary bodies, for instance, in the development of plate tectonics. In this study, we experimentally determine how quickly hydrogen isotopes are exchanged between minerals and fluids. We then explore how exchange rates can inform us about past interactions between rocks and water on the Earth and in meteorites using hydrogen isotope measurements in natural minerals.
Nicolas Esteves, Pierre Bouilhol, Urs Schaltegger, Maria Ovtcharova, André Navin Paul, and Lydéric France
Eur. J. Mineral., 37, 667–693, https://doi.org/10.5194/ejm-37-667-2025, https://doi.org/10.5194/ejm-37-667-2025, 2025
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Zircon in highly differentiated systems such as rare-metal granites often exhibits unusual texture and composition that need to be clarified. Based on a detailed study on zircon from the Beauvoir rare-metal granite (France), we show that zircon crystals were partially replaced during the magmatic–hydrothermal transition of these systems, resulting in a significant change in their crystal texture and chemistry.
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Short summary
Water in the form of hydrous-point-defect pyroxenes from mantle xenoliths is used to trace the water content in the lithospheric mantle. However, little is known about the mechanism that allows xenoliths to preserve deep hydrogen signatures. In particular, it is unknown how much of the water content of xenoliths is modified during the emplacement of lava and cooling at the surface and by the eruption mode (effusive versus explosive). In this work, we attempted to address these matters.
Water in the form of hydrous-point-defect pyroxenes from mantle xenoliths is used to trace the...