Experimental study of reaction between perovskite and molten iron to 146 GPa and implications for chemically distinct buoyant layer at the top of the core

Haruka Ozawa, Kei Hirose, Masanori Mitome, Yoshio Bando, Nagayoshi Sata, Yasuo Ohishi

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Partitioning of oxygen and silicon between molten iron and (Mg,Fe)SiO3 perovskite was investigated by a combination of laser-heated diamond-anvil cell (LHDAC) and analytical transmission electron microscope (TEM) to 146 GPa and 3,500 K. The chemical compositions of co-existing quenched molten iron and perovskite were determined quantitatively with energy-dispersive X-ray spectrometry (EDS) and electron energy loss spectroscopy (EELS). The results demonstrate that the quenched liquid iron in contact with perovskite contained substantial amounts of oxygen and silicon at such high pressure and temperature (P-T). The chemical equilibrium between perovskite, ferropericlase, and molten iron at the P-T conditions of the core-mantle boundary (CMB) was calculated in Mg-Fe-Si-O system from these experimental results and previous data on partitioning of oxygen between molten iron and ferropericlase. We found that molten iron should include oxygen and silicon more than required to account for the core density deficit (

Original languageEnglish
Pages (from-to)355-363
Number of pages9
JournalPhysics and Chemistry of Minerals
Volume36
Issue number6
DOIs
Publication statusPublished - 2009
Externally publishedYes

Fingerprint

perovskite
Perovskite
Molten materials
experimental study
Iron
iron
Silicon
Oxygen
silicon
oxygen
partitioning
electron
diamond anvil cell
Diamond
core-mantle boundary
Electron energy loss spectroscopy
Contacts (fluid mechanics)
spectrometry
energy
Energy dispersive spectroscopy

Keywords

  • Core-mantle boundary
  • Light elements
  • Molten iron
  • Outer core
  • Perovskite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Materials Science(all)

Cite this

Experimental study of reaction between perovskite and molten iron to 146 GPa and implications for chemically distinct buoyant layer at the top of the core. / Ozawa, Haruka; Hirose, Kei; Mitome, Masanori; Bando, Yoshio; Sata, Nagayoshi; Ohishi, Yasuo.

In: Physics and Chemistry of Minerals, Vol. 36, No. 6, 2009, p. 355-363.

Research output: Contribution to journalArticle

Ozawa, Haruka ; Hirose, Kei ; Mitome, Masanori ; Bando, Yoshio ; Sata, Nagayoshi ; Ohishi, Yasuo. / Experimental study of reaction between perovskite and molten iron to 146 GPa and implications for chemically distinct buoyant layer at the top of the core. In: Physics and Chemistry of Minerals. 2009 ; Vol. 36, No. 6. pp. 355-363.
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AU - Bando, Yoshio

AU - Sata, Nagayoshi

AU - Ohishi, Yasuo

PY - 2009

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