European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 2
Articles | Volume 37, issue 2
https://doi.org/10.5194/ejm-37-143-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-143-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 2
Letter
 | 
07 Mar 2025
Letter |  | 07 Mar 2025

Fe3+∕ΣFe variation in lawsonite and epidote in subducted oceanic crust

Donna L. Whitney, Max Wilke, Sara E. Hanel, Florian Heidelbach, Olivier Mathon, and Angelika D. Rosa

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Cited articles

Brown, E. H.: Phase equilibria among pumpellyite, lawsonite, epidote and associated minerals in low grade metamorphic rocks, Contrib. Mineral. Petrol., 64, 123–136, 1977. 
Botcharnikov, R., Wilke, M., Garrevoet, J., Portnyagin, M., Klimm, K., Buhre, S., Krasheninnikov, S., Almeev, R., Moune, S., and Falkenberg, G.: Confocal μ-XANES as a tool to analyze Fe oxidation state in heterogeneous samples: the case of melt inclusions in olivine from the Hekla volcano, Eur. J. Mineral., 36, 195–208, https://doi.org/10.5194/ejm-36-195-2024, 2024. 
Chantel, J., Mookherjee, M., and Frost, D. J.: The elasticity of lawsonite at high pressure and the origin of low velocity layers in subduction zones, Earth Planet. Sci. Lett., 349–350, 116–125, https://doi.org/10.1016/j.epsl.2012.06.034, 2012. 
Chapman, T. and Clarke, G. L.: Cryptic evidence for the former presence of lawsonite in blueschist and eclogite, J. Metamorph. Geol., 39, 343–362, https://doi.org/10.1111/jmg.12578, 2021. 
Dollase, W. A.: Mössbauer spectra and iron distribution in the epidote group minerals, Zeitschr. Kristall., 138, 41–63, 1973. 
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Short summary
The Earth recycles water and other elements in a vast system that involves the oceans, minerals, magma, and the atmosphere. We studied the part of the system that involves minerals, specifically, lawsonite and epidote because they contain both water and iron. Iron in these minerals is usually assumed to be Fe3+, but we discovered an unexpected amount of Fe2+. Reactions involving different states of Fe and water in minerals affect many processes related to element cycling in the Earth.
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