Articles | Volume 38, issue 4
https://doi.org/10.5194/ejm-38-477-2026
https://doi.org/10.5194/ejm-38-477-2026
Research article
 | 
27 Jul 2026
Research article |  | 27 Jul 2026

Preservation of water concentration in mantle xenoliths: a case study from Allègre and Ray Pic volcanoes (French Massif Central)

Konstantinos Thomaidis, Jannick Ingrin, Etienne Deloule, Lydéric France, and Huan Chen

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Cited articles

Azevedo-Vannson, S., France, L., Ingrin, J., and Chazot, G.: Mantle metasomatic influence on water contents in continental lithosphere: New constraints from garnet pyroxenite xenoliths (France & Cameroon volcanic provinces), Chem. Geol., 575, 120257, https://https://doi.org/10.1016/j.chemgeo.2021.120257, 2021. 
Bell, D. R. and Rossman, G. R.: Water in the Earth's mantle: the role of nominally anhydrous minerals, Science, 255, 1391–1397, https://doi.org/10.1126/science.255.5050.1391, 1992. 
Bell, D. R., Ihinger, P. D., and Rossman, G. R.: Quantitative analysis of trace OH in garnet and pyroxenes, Am. Mineral., 80, 465–474, https://doi.org/10.2138/am-1995-5-607, 1995. 
Bräuer, K., Kämpf, H., Niedermann, S., and Wetzel, H.-U.: Regional distribution pattern of carbon and helium isotopes from different volcanic fields in the French Massif Central: Evidence for active mantle degassing and water transport, Chem. Geol., 469, 4–18, https://doi.org/10.1016/j.chemgeo.2017.04.004, 2017. 
Brey, G. P. and Köhler, T.: Geothermobarometry in four-phase lherzolites II. New thermobarometers, and practical assessment of existing thermobarometers, J. Petrol., 31, 1353–1378, https://doi.org/10.1093/petrology/31.6.1353, 1990. 
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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.
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