Spin transition, substitution, and partitioning of iron in lower mantle minerals

被引：13

作者：

Fujino, Kiyoshi ^{[1
]}

Nishio-Hamane, Daisuke ^{[2
]}

Nagai, Takaya ^{[3
]}

Seto, Yusuke ^{[4
]}

Kuwayama, Yasuhiro ^{[1
]}

Whitaker, Matthew ^{[1
,5
]}

Ohfuji, Hiroaki ^{[1
]}

Shinmei, Toru ^{[1
]}

Irifune, Tetsuo ^{[1
,6
]}

机构：

[1] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[3] Hokkaido Univ, Dept Nat Hist Sci, Sapporo, Hokkaido 0600810, Japan

[4] Kobe Univ, Dept Earth & Planetary Sci, Kobe, Hyogo 6578501, Japan

[5] SUNY Stony Brook, Inst Mineral Phys, Stony Brook, NY 11794 USA

[6] Tokyo Inst Technol, Earth Life Sci Inst, Tokyo 1528550, Japan

来源：

PHYSICS OF THE EARTH AND PLANETARY INTERIORS | 2014年 / 228卷

基金：

日本学术振兴会;

关键词：

Lower mantle; Spin transition of iron; Mg-perovskite; Post-Mg-perovskite; Fe3+-Al coupled substitution; Iron-partitioning; POST-PEROVSKITE; FERROUS IRON; MOSSBAUER-SPECTROSCOPY; SYNCHROTRON MOSSBAUER; EARTHS MANTLE; FERRIC IRON; STATE; PHASE; PRESSURE; PYROLITE;

D O I：

10.1016/j.pepi.2013.12.008

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Spin transition and substitution of Fe3+ in Fe3+AlO3-bearing MgSiO3 perovskite (Pv) and post-perovskite (PPv) were examined up to 200 and 165 GPa, respectively, at room temperature by X-ray emission spectroscopy (XES) and XRD. The results of XES and XRD indicate that in Pv high spin (HS) Fe3+ at the dodecahedral (A) site replaces Al at the octahedral (B) site and becomes low spin (LS) between 50 and 70 GPa with pressure, while in PPv LS Fe3+ occupies the B-site and Al occupies the A-site above 80-100 GPa. The Fe3+ Al coupled substitution seems to be at work in both Pv and PPv. Combining these results on Fe3+ with the recent first-principles calculations on Fe2+ in Pv and PPv, the spin transition and substitution of iron in pyrolitic lower mantle minerals are proposed. Further, their effects on iron-partitioning among the lower mantle minerals are discussed. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：186 / 191

页数：6

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