Melting relations in the Fe–S–Si system at high pressure and temperature: Implications for the planetary core

Takanori Sakairi, Eiji Otani, Seiji Kamada, Takeshi Sakai, Tatsuya Sakamaki, Naohisa Hirao

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The phase and melting relations in the Fe–S–Si system were determined up to 60 GPa by using a double-sided laser-heated diamond anvil cell combined with X-ray diffraction. On the basis of the X-ray diffraction patterns, we confirmed that hcp/fcc Fe–Si alloys and Fe 3 S are stable phases under subsolidus conditions in the Fe–S–Si system. Both solidus and liquidus temperatures are significantly lower than the melting temperature of pure Fe and both increase with pressure. The slopes of the Fe–S–Si liquidus and solidus curves determined here are smaller than the adiabatic temperature gradients of the liquid cores of Mercury and Mars. Thus, crystallization of their cores started at the core–mantle boundary region.

Original languageEnglish
Article number10
JournalProgress in Earth and Planetary Science
Volume4
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • Diamond anvil cell
  • Fe-S-Si system
  • Melting relations
  • Planetary core

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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