Articles | Volume 35, issue 4
https://doi.org/10.5194/ejm-35-549-2023
https://doi.org/10.5194/ejm-35-549-2023
Research article
 | 
31 Jul 2023
Research article |  | 31 Jul 2023

Effect of oxygen fugacity on the storage of water in wadsleyite and olivine in H and H–C fluids and implications for melting atop the transition zone

Nathalie Bolfan-Casanova, Loïs Martinek, Geeth Manthilake, Maximilien Verdier-Paoletti, and Paul Chauvigne

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Cited articles

Andrault, D. and Bolfan-Casanova, N.: Mantle rain toward the Earth's surface: A model for the internal cycle of water, Phys. Earth Planet. Int., 322, 106815, https://doi.org/10.1016/j.pepi.2021.106815, 2022. 
Balan, E., Blanchard, M., Lazzeri, M., and Ingrin, J.: Theoretical Raman spectrum and anharmonicity of tetrahedral OH defects in hydrous forsterite, Eur. J. Miner., 29, 201–212, 2017. 
Bali, E., Bolfan-Casanova, N., and Koga, K. T.: Pressure and temperature dependence of H solubility in forsterite: An implication to water activity in the Earth interior, Earth Planet. Sc. Lett., 268, 354–363, 2008. 
Bercovi, D. and Karato, S.: Whole mantle convection and the transition-zone water filter, Nature, 425, 39–44, 2003. 
Bolfan-Casanova, N., Montagnac, G., and Reynard, B.: Measurement of water contents in olivine using Raman spectroscopy, Am. Mineral., 99, 149–156, 2014. 
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Short summary
This work shows that even under the low oxygen fugacities prevailing in the deep upper mantle and transition zone, around 410 km depth, the storage capacity in the nominally anhydrous mineral olivine and its high-pressure polymorph, wadsleyite, is still substantial, with up to 0.8–1 wt % at the iron-wüstite buffer and 1300–1400 °C for wadsleyite, even in the presence of carbon.