Melting experiments on Fe–Fe3S system to 254 GPa

Yuko Mori, Haruka Ozawa, Kei Hirose, Ryosuke Sinmyo, Shigehiko Tateno, Guillaume Morard, Yasuo Ohishi

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Melting experiments were performed on the Fe–Fe3S system at high pressures between 34 and 254 GPa in a laser-heated diamond-anvil cell (DAC), using starting materials of fine-grained homogeneous mixtures of Fe and FeS (<500 nm) prepared by induction melting and rapid quenching techniques. Melting phase relations including the liquid/solid partitioning of sulfur were examined on the basis of textural and chemical characterizations of recovered samples using a focused ion beam (FIB) and electron microprobes. The results demonstrate that the sulfur content in eutectic liquid decreases substantially with increasing pressure. The eutectic liquid Fe with 5.7(±0.3) wt.% S coexisted with both solid Fe3S and Fe containing 3.9(±0.4) wt.% S at 254 GPa and 3550 K. The eutectic liquid at inner core boundary (ICB) pressure includes less sulfur than is required to account for the density deficit of the outer core (≥10 wt.% S). Furthermore, the difference in sulfur concentration between coexisting liquid and solid is not sufficient to account for the observed density jump across the ICB. These indicate that sulfur cannot be a predominant light element in the core.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalEarth and Planetary Science Letters
Volume464
DOIs
Publication statusPublished - Apr 15 2017

Fingerprint

Sulfur
Melting
sulfur
melting
liquid
eutectics
Eutectics
Liquids
liquids
inner core
experiment
Experiments
Rapid quenching
diamond anvil cell
outer core
Diamond
light elements
Focused ion beams
anvils
electron probe analysis

Keywords

  • core
  • diamond-anvil cell
  • eutectic liquid
  • high-pressure
  • melting
  • sulfur

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Mori, Y., Ozawa, H., Hirose, K., Sinmyo, R., Tateno, S., Morard, G., & Ohishi, Y. (2017). Melting experiments on Fe–Fe3S system to 254 GPa. Earth and Planetary Science Letters, 464, 135-141. https://doi.org/10.1016/j.epsl.2017.02.021

Melting experiments on Fe–Fe3S system to 254 GPa. / Mori, Yuko; Ozawa, Haruka; Hirose, Kei; Sinmyo, Ryosuke; Tateno, Shigehiko; Morard, Guillaume; Ohishi, Yasuo.

In: Earth and Planetary Science Letters, Vol. 464, 15.04.2017, p. 135-141.

Research output: Contribution to journalArticle

Mori, Y, Ozawa, H, Hirose, K, Sinmyo, R, Tateno, S, Morard, G & Ohishi, Y 2017, 'Melting experiments on Fe–Fe3S system to 254 GPa', Earth and Planetary Science Letters, vol. 464, pp. 135-141. https://doi.org/10.1016/j.epsl.2017.02.021
Mori Y, Ozawa H, Hirose K, Sinmyo R, Tateno S, Morard G et al. Melting experiments on Fe–Fe3S system to 254 GPa. Earth and Planetary Science Letters. 2017 Apr 15;464:135-141. https://doi.org/10.1016/j.epsl.2017.02.021
Mori, Yuko ; Ozawa, Haruka ; Hirose, Kei ; Sinmyo, Ryosuke ; Tateno, Shigehiko ; Morard, Guillaume ; Ohishi, Yasuo. / Melting experiments on Fe–Fe3S system to 254 GPa. In: Earth and Planetary Science Letters. 2017 ; Vol. 464. pp. 135-141.
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