Ferrous Iron Under Oxygen‐Rich Conditions in the Deep Mantle

Boulard, E.; Harmand, M.; Guyot, F.; Lelong, G.; Morard, G.; Cabaret, D.; Boccato, S.; Rosa, A. D.; Briggs, R.; Pascarelli, S.; Fiquet, G.

doi:10.1029/2019GL081922

Title: Ferrous Iron Under Oxygen‐Rich Conditions in the Deep Mantle

Journal Article · Thu Feb 14 00:00:00 EST 2019 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2019GL081922· OSTI ID:1494842

^[1];

^[1]; Guyot, F. ^[1]; Lelong, G. ^[1];

^[1]; Cabaret, D. ^[1];

^[2]; Rosa, A. D. ^[3];

^[4]; Pascarelli, S. ^[3]; Fiquet, G. ^[1]

Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRD Institut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC 4 Place Jussieu 75005 Paris France
Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, IRD Institut de Minéralogie, Physique des Matériaux et Cosmochimie ‐ IMPMC 4 Place Jussieu 75005 Paris France, European Synchrotron Radiation Facility Grenoble France
European Synchrotron Radiation Facility Grenoble France
European Synchrotron Radiation Facility Grenoble France, Now at Lawrence Livermore National Laboratory Livermore California USA

Abstract Recent experiments have demonstrated the existence of previously unknown iron oxides at high pressure and temperature including newly discovered pyrite‐type FeO ₂ and FeO ₂ H _x phases stable at deep terrestrial lower mantle pressures and temperatures. In the present study, we probed the iron oxidation state in high‐pressure transformation products of Fe ³⁺ OOH goethite by in situ X‐ray absorption spectroscopy in laser‐heated diamond‐anvil cell. At pressures and temperatures of ~91 GPa and 1,500–2,350 K, respectively, that is, in the previously reported stability field of FeO ₂ H _x , a measured shift of −3.3 ± 0.1 eV of the Fe K‐edge demonstrates that iron has turned from Fe ³⁺ to Fe ²⁺ . We interpret this reductive valence change of iron by a concomitant oxidation of oxygen atoms from O ²⁻ to O ⁻ , in agreement with previous suggestions based on the structures of pyrite‐type FeO ₂ and FeO ₂ H _x phases. Such peculiar chemistry could drastically change our view of crystal chemistry in deep planetary interiors.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52‐07NA27344; AC52-07NA27344

OSTI ID:: 1494842

Alternate ID(s):: OSTI ID: 1494843; OSTI ID: 1497938

Report Number(s):: LLNL-JRNL-758622

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 46 Journal Issue: 3; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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