Evidence for the Fe(II)-Fe(III) Green Rust "Fougérite" mineral occurrence in a hydromorphic soil and its transformation with depth

Abstract : Mössbauer spectroscopy is used to characterize a Green Rust as a natural mineral for the first time. Samples are taken from a hydromorphic soil under the forest at Fougères (Brittany, France) during spring season. Spectra are compared with those of synthetic Green Rusts (GRs), i.e. hydroxy-chloride, -sulphate, -carbonate and display one ferric and one or two ferrous sites. Fe(II)/Fe(III) abundances ratio cannot be attributed definitely to one of those stoichiometric compounds. Therefore, the counter-anion species cannot be specified even though hyperfine parameters perfectly match values of synthetic samples. The Fe(II)/Fe(III) ratio obtained from the Mössbauer spectra decreases with sampling depth. The "fougerite" originates likely from the reduction of deeper Fe(III)-mineral species by anoxic waterlogging.
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Submitted on : Friday, December 7, 2018 - 9:55:44 AM
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Mustapha Abdelmoula, F. Trolard, G. Bourrié, M. Génin. Evidence for the Fe(II)-Fe(III) Green Rust "Fougérite" mineral occurrence in a hydromorphic soil and its transformation with depth. Hyperfine Interactions, Springer Verlag, 1998, 112 (1/4), pp.235-238. ⟨10.1023/A:1010802508927⟩. ⟨hal-01947708⟩

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