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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

The valence state and partitioning of iron in the Earth’s lowermost mantle

http://hdl.handle.net/2237/20807
http://hdl.handle.net/2237/20807
1d37d5bf-167c-4a9f-b2c4-987b4d6397be
名前 / ファイル ライセンス アクション
jgrb16835.pdf jgrb16835.pdf (568.2 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2014-11-18
タイトル
タイトル The valence state and partitioning of iron in the Earth’s lowermost mantle
言語 en
著者 Sinmyo, Ryosuke

× Sinmyo, Ryosuke

WEKO 54544

en Sinmyo, Ryosuke

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Hirose, Kei

× Hirose, Kei

WEKO 54545

en Hirose, Kei

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Muto, Shunsuke

× Muto, Shunsuke

WEKO 54546

en Muto, Shunsuke

Search repository
Ohishi, Yasuo

× Ohishi, Yasuo

WEKO 54547

en Ohishi, Yasuo

Search repository
Yasuhara, Akira

× Yasuhara, Akira

WEKO 54548

en Yasuhara, Akira

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 Copyright 2011 by the American Geophysical Union.
キーワード
主題Scheme Other
主題 Experimental mineralogy and petrology
キーワード
主題Scheme Other
主題 High-pressure behavior
キーワード
主題Scheme Other
主題 Mineral and crystal chemistry
キーワード
主題Scheme Other
主題 Reactions and phase equilibria
キーワード
主題Scheme Other
主題 X-ray, neutron, and electron spectroscopy and diffraction
抄録
内容記述 1] While iron occurs predominantly in the form of Fe^2+ in the Earth's upper mantle and transition zone, Al-bearing (Mg,Fe)SiO3 perovskite (Pv), a primary mineral in the lower mantle, contains a large proportion of ferric iron (Fe^3+). It has been demonstrated that such Fe^3+ strongly affects physical and chemical properties of Pv. On the other hand, the iron substitution mechanism and valence state of iron in postperovskite (PPv) are still unclear. Here we determined the valence state of iron in PPv with changing Al^3+ content, on the basis of electron energy-loss near-edge structure spectroscopy measurements. The results show that PPv includes a small amount of Fe^3+, which is independent from the Al3+ content. This indicates that Fe^3+ in Pv and coexisting metallic iron recombine to form Fe^2+ upon phase transition from Pv to PPv in pyrolitic mantle. Such Fe^2+ partitions preferentially into (Mg,Fe)O ferropericlase (Fp), and therefore PPv is depleted in iron compared to Pv. Such a marked change in the valence state of iron and resulting iron depletion in PPv have broad implications for seismic and transport properties in the lowermost mantle. Phase transition from Pv to Fe-poor PPv occurs in a much narrower pressure range than that for a fixed iron content.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 John Wiley & Sons
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1029/2010JB008179
ISSN
収録物識別子タイプ PISSN
収録物識別子 0148-0227
書誌情報 en : Journal of Geophysical Research: Solid Earth

巻 116, 号 B7, p. B07205-B07205, 発行日 2011-07
著者版フラグ
値 publisher
URI
識別子 http://dx.doi.org/10.1029/2010JB008179
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/20807
識別子タイプ HDL
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