Ferric iron content in (Mg,Fe)SiO3 perovskite and post-perovskite at deep lower mantle conditions

Ryosuke Sinmyo, Haruka Ozawa, Kei Hirose, Akira Yasuhara, Noriaki Endo, Nagayoshi Sata, Yasuo Ohishi

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We have determined the Fe3+/∑Fe ratio of Al-free (Mg,Fe)SiO3 perovskite, post-perovskite, and (Mg,Fe)O ferropericlase synthesized at 99 to 187 GPa and 1830 to 3500 K based on the electron energy-loss near-edge structure (ELNES) spectroscopy. The results demonstrate that post-perovskite includes minor amounts of ferric iron with Fe3+/∑Fe ratios of 0.11 to 0.21. These values are substantially lower than those of Al-rich post-perovskite (Fe3+/∑Fe = 0.59 to 0.69) reported in a previous study, suggesting that the Fe3+-Al3+ coupled substitution is important in post-perovskite, as in the case of perovskite. The Al-bearing post-perovskite in a pyrolitic mantle composition likely contains a considerable amount of ferric iron, which affects various physical properties in the lowermost mantle.

Original languageEnglish
Pages (from-to)1899-1902
Number of pages4
JournalAmerican Mineralogist
Volume93
Issue number11-12
DOIs
Publication statusPublished - Nov 2008
Externally publishedYes

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perovskite
lower mantle
Earth mantle
Iron
iron
physical properties
energy dissipation
electron energy
substitutes
spectroscopy
Bearings (structural)
mantle
olivine
Energy dissipation
substitution
Substitution reactions
Physical properties
physical property
Spectroscopy
electron

Keywords

  • D″ layer
  • Ferric iron
  • Lower mantle
  • Perovskite
  • Post-perovskite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Sinmyo, R., Ozawa, H., Hirose, K., Yasuhara, A., Endo, N., Sata, N., & Ohishi, Y. (2008). Ferric iron content in (Mg,Fe)SiO3 perovskite and post-perovskite at deep lower mantle conditions. American Mineralogist, 93(11-12), 1899-1902. https://doi.org/10.2138/am.2008.2806

Ferric iron content in (Mg,Fe)SiO3 perovskite and post-perovskite at deep lower mantle conditions. / Sinmyo, Ryosuke; Ozawa, Haruka; Hirose, Kei; Yasuhara, Akira; Endo, Noriaki; Sata, Nagayoshi; Ohishi, Yasuo.

In: American Mineralogist, Vol. 93, No. 11-12, 11.2008, p. 1899-1902.

Research output: Contribution to journalArticle

Sinmyo, R, Ozawa, H, Hirose, K, Yasuhara, A, Endo, N, Sata, N & Ohishi, Y 2008, 'Ferric iron content in (Mg,Fe)SiO3 perovskite and post-perovskite at deep lower mantle conditions', American Mineralogist, vol. 93, no. 11-12, pp. 1899-1902. https://doi.org/10.2138/am.2008.2806
Sinmyo, Ryosuke ; Ozawa, Haruka ; Hirose, Kei ; Yasuhara, Akira ; Endo, Noriaki ; Sata, Nagayoshi ; Ohishi, Yasuo. / Ferric iron content in (Mg,Fe)SiO3 perovskite and post-perovskite at deep lower mantle conditions. In: American Mineralogist. 2008 ; Vol. 93, No. 11-12. pp. 1899-1902.
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AU - Endo, Noriaki

AU - Sata, Nagayoshi

AU - Ohishi, Yasuo

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N2 - We have determined the Fe3+/∑Fe ratio of Al-free (Mg,Fe)SiO3 perovskite, post-perovskite, and (Mg,Fe)O ferropericlase synthesized at 99 to 187 GPa and 1830 to 3500 K based on the electron energy-loss near-edge structure (ELNES) spectroscopy. The results demonstrate that post-perovskite includes minor amounts of ferric iron with Fe3+/∑Fe ratios of 0.11 to 0.21. These values are substantially lower than those of Al-rich post-perovskite (Fe3+/∑Fe = 0.59 to 0.69) reported in a previous study, suggesting that the Fe3+-Al3+ coupled substitution is important in post-perovskite, as in the case of perovskite. The Al-bearing post-perovskite in a pyrolitic mantle composition likely contains a considerable amount of ferric iron, which affects various physical properties in the lowermost mantle.

AB - We have determined the Fe3+/∑Fe ratio of Al-free (Mg,Fe)SiO3 perovskite, post-perovskite, and (Mg,Fe)O ferropericlase synthesized at 99 to 187 GPa and 1830 to 3500 K based on the electron energy-loss near-edge structure (ELNES) spectroscopy. The results demonstrate that post-perovskite includes minor amounts of ferric iron with Fe3+/∑Fe ratios of 0.11 to 0.21. These values are substantially lower than those of Al-rich post-perovskite (Fe3+/∑Fe = 0.59 to 0.69) reported in a previous study, suggesting that the Fe3+-Al3+ coupled substitution is important in post-perovskite, as in the case of perovskite. The Al-bearing post-perovskite in a pyrolitic mantle composition likely contains a considerable amount of ferric iron, which affects various physical properties in the lowermost mantle.

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