Ferric iron stabilization at deep magma ocean conditions

Fe<sub>2</sub>O<sub>3</sub> produced in a deep magma ocean in equilibrium with core-destined alloy sets the early redox budget and atmospheric composition of terrestrial planets. Previous experiments (≤28 gigapascals) and first-principles calculations indicate that a deep terrestrial magma ocean produces appreciable Fe<sup>3+</sup> but predict Fe<sup>3+</sup>/ΣFe ratios that conflict by an order of magnitude. We present Fe<sup>3+</sup>/ΣFe of glasses quenched from melts equilibrated with Fe alloy at 38 to 71 gigapascals, 3600 to 4400 kelvin, analyzed by synchrotron Mössbauer spectroscopy. These indicate Fe<sup>3+</sup>/ΣFe of 0.056 to 0.112 in a terrestrial magma ocean with mean alloy-silicate equilibration pressures of 28 to 53 gigapascals, producing sufficient Fe<sub>2</sub>O<sub>3</sub> to account for the modern bulk silicate Earth redox budget and surficial conditions near or more oxidizing than the iron-wüstite buffer, which would stabilize a primitive CO- and H<sub>2</sub>O-rich atmosphere.

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Publication Details

Journal
Science Advances
Published
2024-10-16
DOI
https://doi.org/10.1126/sciadv.adp1752
Citations
11
Primary Topic
High-pressure geophysics and materials
Type
article
Field-Weighted Citation Impact
5.88

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article

Ferric iron stabilization at deep magma ocean conditions

Sergey Yaroslavtsev, Elizabeth Cottrell, O. T. Lord, Michael J. Walter et al.
11 citations
Science Advances
High-pressure geophysics and materials
5.88
article

Ferric iron stabilization at deep magma ocean conditions

Sergey Yaroslavtsev, Elizabeth Cottrell, O. T. Lord, Michael J. Walter, A. I. Chumakov, M. M. Hirschmann, Hongluo Zhang, Anja Rosenthal
article en
11 citations

Abstract

Fe<sub>2</sub>O<sub>3</sub> produced in a deep magma ocean in equilibrium with core-destined alloy sets the early redox budget and atmospheric composition of terrestrial planets. Previous experiments (≤28 gigapascals) and first-principles calculations indicate that a deep terrestrial magma ocean produces appreciable Fe<sup>3+</sup> but predict Fe<sup>3+</sup>/ΣFe ratios that conflict by an order of magnitude. We present Fe<sup>3+</sup>/ΣFe of glasses quenched from melts equilibrated with Fe alloy at 38 to 71 gigapascals, 3600 to 4400 kelvin, analyzed by synchrotron Mössbauer spectroscopy. These indicate Fe<sup>3+</sup>/ΣFe of 0.056 to 0.112 in a terrestrial magma ocean with mean alloy-silicate equilibration pressures of 28 to 53 gigapascals, producing sufficient Fe<sub>2</sub>O<sub>3</sub> to account for the modern bulk silicate Earth redox budget and surficial conditions near or more oxidizing than the iron-wüstite buffer, which would stabilize a primitive CO- and H<sub>2</sub>O-rich atmosphere.

Science AdvancesVol. 10(42)
Smithsonian Institution (US), Australian National University (AU), University of Minnesota (US), National Museum of Natural History (US), Carnegie Institution for Science (US), European Synchrotron Radiation Facility (FR), China University of Geosciences (Beijing) (CN), University of Bristol (GB)
National Science Foundation, Smithsonian Institution, Sight Research UK, National Natural Science Foundation of China, National Museum of Natural History, Natural Environment Research Council
Life below water
Openalex Percentile: Top 3%
High-pressure geophysics and materials
5.88
DOIOpen Access PDFOpenAlex
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