Ferric iron in Al-bearing post-perovskite

Details Ferric iron in Al-bearing post-perovskite Ferric iron in Al-bearing post-perovskite

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3312s13s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 12, CiteID L12S13

Physics

17

Geochemistry: Composition Of The Mantle, Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

The Fe3+/ΣFe 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+/ΣFe 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+/ΣFe ratio of 0.15 and 0.29.

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