Eutectic temperatures and melting relations in the Fe-O-S system at high pressures and temperatures

Kyusei Tsuno, Eiji Ohtani

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We have investigated melting relations in the Fe-O-S ternary system in the pressure range of 15-27 GPa and 1873 K. Subsolidus phase relations are Fe, Fe3S2, and FeO up to 17 GPa and Fe, Fe3S, and FeO above this pressure. The eutectic temperature slightly decreases from ambient pressure to 17 GPa, whereas increases above this pressure. The eutectic temperature in this study is 100 K lower than that in the Fe-S binary system. The oxygen content in the Fe-O-S eutectic liquid drops when the coexisting solid phases changes from FeS to Fe3S2. The cotectic lines in the ternary phase diagram lie close to the Fe-FeS binary axis. The isothermal sections indicate that oxygen solubility in the Fe-O-S liquid increases with increasing temperature, and with increasing sulfur content. The solubility of sulfur in the solid Fe has a maximum value at the eutectic temperature, and decreases with increasing temperature. Our results could have important implications for formation and composition of the Martian core.

Original languageEnglish
Pages (from-to)9-17
Number of pages9
JournalPhysics and Chemistry of Minerals
Volume36
Issue number1
DOIs
Publication statusPublished - 2009

Keywords

  • Core
  • High-pressure
  • Iron
  • Mars
  • Oxygen
  • Sulfur

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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