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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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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