Melting experiments on Fe–Fe3S system to 254 GPa

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

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27 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

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

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    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