Fe-Mg partitioning between (Mg, Fe)SiO3 post-perovskite, perovskite, and magnesiowüstite in the Earth's lower mantle

Yusuke Kobayashi; Tadashi Kondo; Eiji Ohtani; Naohisa Hirao; Nobuyoshi Miyajima; Takehiko Yagi; Toshiro Nagase; Takumi Kikegawa

doi:10.1029/2005GL023257

Fe-Mg partitioning between (Mg, Fe)SiO₃ post-perovskite, perovskite, and magnesiowüstite in the Earth's lower mantle

Yusuke Kobayashi, Tadashi Kondo, Eiji Ohtani, Naohisa Hirao, Nobuyoshi Miyajima, Takehiko Yagi, Toshiro Nagase, Takumi Kikegawa

Museum

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

96 Citations (Scopus)

Abstract

We report here new data on pressure dependence of Fe-Mg partitioning between (Mg, Fe)SiO₃ perovskite (Pv) and magnesiowüstite (Mw), K^Pv/Mw and (Mg, Fe)SiO₃ Postperovskite (PPv) and Mw, K^PPv/Mw, up to 123.6 GPa at 1600 K measured by synchrotron X-ray diffraction method and analytical transmission electron microscopy (ATEM). We observed a high FeO content in PPv coexisting with Mw [K^PPv/Mw = (FeO/MgO)^PPv/(FeO/MgO)M_w = 0.30] compared to that in Pv [K^pv/Mw = (FeO/MgO)^Pv/ (FeO/MgO)^Mw = 0. 12] observed from 23.0 to 95.4 GPa. K^Pv/Mw keeps a constant value of 0.12 up to the PPv phase boundary. Our results also support the possibility that a metallic phase may form in the lower mantle. The assemblage of PPv and Mw is 1.5-1.7% denser than the Pv bearing assemblage, which results in a gravitational stabilization of the lowermost mantle.

Original language	English
Article number	L19301
Pages (from-to)	1-4
Number of pages	4
Journal	Geophysical Research Letters
Volume	32
Issue number	19
DOIs	https://doi.org/10.1029/2005GL023257
Publication status	Published - 2005 Oct 16

Access to Document

10.1029/2005GL023257

Cite this

@article{f798c34e0aa64c43be056a99c29f3e71,

title = "Fe-Mg partitioning between (Mg, Fe)SiO3 post-perovskite, perovskite, and magnesiow{\"u}stite in the Earth's lower mantle",

abstract = "We report here new data on pressure dependence of Fe-Mg partitioning between (Mg, Fe)SiO3 perovskite (Pv) and magnesiow{\"u}stite (Mw), KPv/Mw and (Mg, Fe)SiO3 Postperovskite (PPv) and Mw, KPPv/Mw, up to 123.6 GPa at 1600 K measured by synchrotron X-ray diffraction method and analytical transmission electron microscopy (ATEM). We observed a high FeO content in PPv coexisting with Mw [KPPv/Mw = (FeO/MgO)PPv/(FeO/MgO)Mw = 0.30] compared to that in Pv [Kpv/Mw = (FeO/MgO)Pv/ (FeO/MgO)Mw = 0. 12] observed from 23.0 to 95.4 GPa. KPv/Mw keeps a constant value of 0.12 up to the PPv phase boundary. Our results also support the possibility that a metallic phase may form in the lower mantle. The assemblage of PPv and Mw is 1.5-1.7% denser than the Pv bearing assemblage, which results in a gravitational stabilization of the lowermost mantle.",

author = "Yusuke Kobayashi and Tadashi Kondo and Eiji Ohtani and Naohisa Hirao and Nobuyoshi Miyajima and Takehiko Yagi and Toshiro Nagase and Takumi Kikegawa",

year = "2005",

month = oct,

day = "16",

doi = "10.1029/2005GL023257",

language = "English",

volume = "32",

pages = "1--4",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "Wiley-Blackwell",

number = "19",

}

TY - JOUR

T1 - Fe-Mg partitioning between (Mg, Fe)SiO3 post-perovskite, perovskite, and magnesiowüstite in the Earth's lower mantle

AU - Kobayashi, Yusuke

AU - Kondo, Tadashi

AU - Ohtani, Eiji

AU - Hirao, Naohisa

AU - Miyajima, Nobuyoshi

AU - Yagi, Takehiko

AU - Nagase, Toshiro

AU - Kikegawa, Takumi

PY - 2005/10/16

Y1 - 2005/10/16

N2 - We report here new data on pressure dependence of Fe-Mg partitioning between (Mg, Fe)SiO3 perovskite (Pv) and magnesiowüstite (Mw), KPv/Mw and (Mg, Fe)SiO3 Postperovskite (PPv) and Mw, KPPv/Mw, up to 123.6 GPa at 1600 K measured by synchrotron X-ray diffraction method and analytical transmission electron microscopy (ATEM). We observed a high FeO content in PPv coexisting with Mw [KPPv/Mw = (FeO/MgO)PPv/(FeO/MgO)Mw = 0.30] compared to that in Pv [Kpv/Mw = (FeO/MgO)Pv/ (FeO/MgO)Mw = 0. 12] observed from 23.0 to 95.4 GPa. KPv/Mw keeps a constant value of 0.12 up to the PPv phase boundary. Our results also support the possibility that a metallic phase may form in the lower mantle. The assemblage of PPv and Mw is 1.5-1.7% denser than the Pv bearing assemblage, which results in a gravitational stabilization of the lowermost mantle.

AB - We report here new data on pressure dependence of Fe-Mg partitioning between (Mg, Fe)SiO3 perovskite (Pv) and magnesiowüstite (Mw), KPv/Mw and (Mg, Fe)SiO3 Postperovskite (PPv) and Mw, KPPv/Mw, up to 123.6 GPa at 1600 K measured by synchrotron X-ray diffraction method and analytical transmission electron microscopy (ATEM). We observed a high FeO content in PPv coexisting with Mw [KPPv/Mw = (FeO/MgO)PPv/(FeO/MgO)Mw = 0.30] compared to that in Pv [Kpv/Mw = (FeO/MgO)Pv/ (FeO/MgO)Mw = 0. 12] observed from 23.0 to 95.4 GPa. KPv/Mw keeps a constant value of 0.12 up to the PPv phase boundary. Our results also support the possibility that a metallic phase may form in the lower mantle. The assemblage of PPv and Mw is 1.5-1.7% denser than the Pv bearing assemblage, which results in a gravitational stabilization of the lowermost mantle.

UR - http://www.scopus.com/inward/record.url?scp=28144449054&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=28144449054&partnerID=8YFLogxK

U2 - 10.1029/2005GL023257

DO - 10.1029/2005GL023257

M3 - Article

AN - SCOPUS:28144449054

SN - 0094-8276

VL - 32

SP - 1

EP - 4

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 19

M1 - L19301

ER -

Fe-Mg partitioning between (Mg, Fe)SiO₃ post-perovskite, perovskite, and magnesiowüstite in the Earth's lower mantle

Abstract

Access to Document

Other files and links

Fingerprint

Cite this