Ferric iron in Al-bearing post-perovskite

Ryosuke Sinmyo; Kei Hirose; Hugh St C. O'Neill; Eiji Okunishi

doi:10.1029/2006GL025858

Ferric iron in Al-bearing post-perovskite

Ryosuke Sinmyo^*, Kei Hirose, Hugh St C. O'Neill, Eiji Okunishi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

Abstract

The Fe³⁺/∑Fe ratios in both (Al, Fe)-bearing MgSiO₃ post-perovskite phase and Ca-ferrite-type Al-phase, synthesized in a natural mid-oceanic ridge basalt (MORB) composition at 113 GPa and 2240 K, were determined by electron energy-loss near-edge structure (ELNES) spectroscopy. The results demonstrate that post-perovskite has high proportions of Fe³⁺ with Fe³⁺/∑Fe ratio of 0.65 ± 0.04. The high Fe³⁺ concentration in post-perovskite may have significant effects on its physical properties, phase stability, and iron partitioning. In contrast, the Ca-ferrite-type Al-phase, which is the second Fe-bearing phase in a subducting MORB crust, is enriched in Fe²⁺ rather than Fe³⁺ with Fe³⁺/∑Fe ratio of 0.15 and 0.29.

Original language	English
Article number	L12S13
Journal	Geophysical Research Letters
Volume	33
Issue number	12
DOIs	https://doi.org/10.1029/2006GL025858
Publication status	Published - 28 Jun 2006

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title = "Ferric iron in Al-bearing post-perovskite",

abstract = "The Fe3+/∑Fe ratios in both (Al, Fe)-bearing MgSiO3 post-perovskite phase and Ca-ferrite-type Al-phase, synthesized in a natural mid-oceanic ridge basalt (MORB) composition at 113 GPa and 2240 K, were determined by electron energy-loss near-edge structure (ELNES) spectroscopy. The results demonstrate that post-perovskite has high proportions of Fe3+ with Fe3+/∑Fe ratio of 0.65 ± 0.04. The high Fe3+ concentration in post-perovskite may have significant effects on its physical properties, phase stability, and iron partitioning. In contrast, the Ca-ferrite-type Al-phase, which is the second Fe-bearing phase in a subducting MORB crust, is enriched in Fe2+ rather than Fe3+ with Fe3+/∑Fe ratio of 0.15 and 0.29.",

author = "Ryosuke Sinmyo and Kei Hirose and O'Neill, \{Hugh St C.\} and Eiji Okunishi",

year = "2006",

month = jun,

day = "28",

doi = "10.1029/2006GL025858",

language = "English",

volume = "33",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley \& Sons Inc.",

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TY - JOUR

T1 - Ferric iron in Al-bearing post-perovskite

AU - Sinmyo, Ryosuke

AU - Hirose, Kei

AU - O'Neill, Hugh St C.

AU - Okunishi, Eiji

PY - 2006/6/28

Y1 - 2006/6/28

N2 - The Fe3+/∑Fe ratios in both (Al, Fe)-bearing MgSiO3 post-perovskite phase and Ca-ferrite-type Al-phase, synthesized in a natural mid-oceanic ridge basalt (MORB) composition at 113 GPa and 2240 K, were determined by electron energy-loss near-edge structure (ELNES) spectroscopy. The results demonstrate that post-perovskite has high proportions of Fe3+ with Fe3+/∑Fe ratio of 0.65 ± 0.04. The high Fe3+ concentration in post-perovskite may have significant effects on its physical properties, phase stability, and iron partitioning. In contrast, the Ca-ferrite-type Al-phase, which is the second Fe-bearing phase in a subducting MORB crust, is enriched in Fe2+ rather than Fe3+ with Fe3+/∑Fe ratio of 0.15 and 0.29.

AB - The Fe3+/∑Fe ratios in both (Al, Fe)-bearing MgSiO3 post-perovskite phase and Ca-ferrite-type Al-phase, synthesized in a natural mid-oceanic ridge basalt (MORB) composition at 113 GPa and 2240 K, were determined by electron energy-loss near-edge structure (ELNES) spectroscopy. The results demonstrate that post-perovskite has high proportions of Fe3+ with Fe3+/∑Fe ratio of 0.65 ± 0.04. The high Fe3+ concentration in post-perovskite may have significant effects on its physical properties, phase stability, and iron partitioning. In contrast, the Ca-ferrite-type Al-phase, which is the second Fe-bearing phase in a subducting MORB crust, is enriched in Fe2+ rather than Fe3+ with Fe3+/∑Fe ratio of 0.15 and 0.29.

UR - https://www.scopus.com/pages/publications/33750612879

U2 - 10.1029/2006GL025858

DO - 10.1029/2006GL025858

M3 - Article

SN - 0094-8276

VL - 33

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 12

M1 - L12S13

ER -

Ferric iron in Al-bearing post-perovskite

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