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Chemical Stability of FeOOH at High Pressure and Temperature, and Oxygen Recycling in Early Earth History

Koemets, Egor ; Fedotenko, Timofey ; Khandarkhaeva, Saiana ; Bykov, Maxim ; Bykova, Elena ; Thielmann, Marcel ; Chariton, Stella ; Aprilis, Georgios ; Koemets, Iuliia ; Glazyrin, Konstantin ; Liermann, Hanns‐Peter ; Hanfland, Michael ; Ohtani, Eiji ; Dubrovinskaia, Natalia ; McCammon, Catherine ; Dubrovinsky, Leonid

European journal of inorganic chemistry, 2021-08, Vol.2021 (30), p.3048-3053 [Periódico revisado por pares]

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Título:
Chemical Stability of FeOOH at High Pressure and Temperature, and Oxygen Recycling in Early Earth History
Autor: Koemets, Egor ; Fedotenko, Timofey ; Khandarkhaeva, Saiana ; Bykov, Maxim ; Bykova, Elena ; Thielmann, Marcel ; Chariton, Stella ; Aprilis, Georgios ; Koemets, Iuliia ; Glazyrin, Konstantin ; Liermann, Hanns‐Peter ; Hanfland, Michael ; Ohtani, Eiji ; Dubrovinskaia, Natalia ; McCammon, Catherine ; Dubrovinsky, Leonid
Assuntos: Earth mantle ; High-pressure chemistry ; Iron ; Iron oxides ; Ocean floor ; Oxidation ; Oxygen ; Plate tectonics ; Recycling ; Redox chemistry ; Structure elucidation ; Synchrotrons
É parte de: European journal of inorganic chemistry, 2021-08, Vol.2021 (30), p.3048-3053
Notas: https://arxiv.org/abs/1908.02114
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A previous version of this manuscript has been deposited on a preprint server
Descrição: Goethite, α‐FeOOH, is a major phase among oxidized iron species, commonly called rust. We studied the behavior of iron (III) oxyhydroxide up to 81 GPa and 2100 K using in situ synchrotron single‐crystal X‐ray diffraction. At high pressure‐temperature conditions FeOOH decomposes forming oxygen‐rich fluid and different mixed valence iron oxides (previously known phases of Fe2O3, Fe3O4, Fe5O7, and novel Fe7O10 and Fe6.32O9). Rust is known to form as a byproduct of anoxygenic prokaryote metabolism that took place massively from about 3.8 billion years (Ga) ago until the Great Oxidation Event (GOE) ∼2.2 Ga ago. Rust was buried on the ocean floor and was transported into the mantle as a consequence of plate tectonics (started ∼2.8 Ga ago). Our results suggest that recycling of rust in Earth's mantle contributes to redox conditions of the early Earth and formation of oxygen‐rich atmosphere. We report a detailed investigation of the stability field of FeOOH at extreme pressures and temperatures corresponding to lower mantle conditions. We observed decomposition of FeOOH with a formation of a series of high‐pressure iron oxides, including two novel ones, Fe7O10 and Fe6.32O9. We discuss their structures and the role of FeOOH decomposition in the Earth's oxygen cycle.
Editor: Weinheim: Wiley Subscription Services, Inc
Idioma: Inglês

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Chemical Stability of FeOOH at High Pressure and Temperature, and Oxygen Recycling in Early Earth History

Weinheim: Wiley Subscription Services, Inc

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