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
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
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 - http://www.scopus.com/inward/record.url?scp=33750612879&partnerID=8YFLogxK
U2 - 10.1029/2006GL025858
DO - 10.1029/2006GL025858
M3 - Article
AN - SCOPUS:33750612879
SN - 0094-8276
VL - 33
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 12
M1 - L12S13
ER -