Articles | Volume 34, issue 6
https://doi.org/10.5194/ejm-34-645-2022
https://doi.org/10.5194/ejm-34-645-2022
Research article
 | 
14 Dec 2022
Research article |  | 14 Dec 2022

Iron oxidation state in serpentines and magnesian chlorites of subduction-related rocks

Bruno Reynard, Clémentine Fellah, and Catherine McCammon

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Cited articles

Aja, S. U. and Dyar, M. D.: The stability of Fe–Mg chlorites in hydrothermal solutions – I. Results of experimental investigations, Appl. Geochem., 17, 1219–1239, https://doi.org/10.1016/S0883-2927(01)00131-7, 2002. 
Andreani, M., Muñoz, M., Marcaillou, C., and Delacour, A.: μ-XANES study of iron redox state in serpentine during oceanic serpentinization, Lithos, 178, 70–83, https://doi.org/10.1016/j.lithos.2013.04.008, 2013. 
Beck, P., De Andrade, V., Orthous-Daunay, F. R., Veronesi, G., Cotte, M., Quirico, E., and Schmitt, B.: The redox state of iron in the matrix of CI, CM and metamorphosed CM chondrites by XANES spectroscopy, Geochim. Cosmochim. Ac., 99, 305–316, https://doi.org/10.1016/j.gca.2012.04.041, 2012. 
Bertoldi, C., Benisek, A., Cemic, L., and Dachs, E.: The heat capacity of two natural chlorite group minerals derived from differential scanning calorimetry, Phys. Chem. Mineral., 28, 332–336, https://doi.org/10.1007/s002690100157, 2001. 
Billault, V., Beaufort, D., Patrier, P., and Petit, S.: Crystal chemistry of Fe-sudoites from uranium deposits in the Athabasca Basin (Saskatchewan, Canada), Clay. Clay Mineral., 50, 70–81, 2002. 
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Short summary
Serpentines, magnesian clay-like minerals formed in subduction zones, contain iron in either ferrous or ferric form. The oxidation state of the iron form controls the composition of fluids that form when they are destabilized by heating. Results obtained here with Mössbauer spectroscopy are compared with X-ray spectroscopy and shown to be more reliable for serpentines and magnesium-rich chlorites. Fluids released by serpentines in subduction may be less oxidized than previously thought.