Melting relationships in the Fe-Fe3S system up to the outer core conditions

Seiji Kamada, Eiji Ohtani, Hidenori Terasaki, Takeshi Sakai, Masaaki Miyahara, Yasuo Ohishi, Naohisa Hirao

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


In situ X-ray diffraction experiments in the Fe-Fe3S system were performed up to 175GPa and 3500K using a laser-heated diamond anvil cell to investigate melting relationships in the system. Partial melting in the Fe-Fe3S system was observed based on the disappearance of X-ray diffraction peaks of solid Fe3S and texture observation of the recovered samples. The melting relationship of the Fe-Fe3S system as a function of pressure is evaluated based on Kraut-Kennedy law. Our results of melting relationships suggest that the temperature at the inner core boundary is between 4700(160) and 4930(330) K if sulfur is the only light element in the Earth's core. Assuming the adiabatic temperature gradient in the outer core, the temperature at the core-mantle boundary is estimated to be in the range of 3600-3770K. The present temperature profile of the core is consistent with the core-mantle boundary temperature that can explain the core heat flux to maintain the core dynamo and the seismic structure at the base of the lower mantle.

Original languageEnglish
Pages (from-to)26-33
Number of pages8
JournalEarth and Planetary Science Letters
Publication statusPublished - Dec 5 2012
Externally publishedYes


  • Core-mantle boundary
  • Earth's outer core
  • Fe-FeS system
  • In situ X-ray diffraction
  • Inner core boundary
  • Laser-heated diamond anvil cell

ASJC Scopus subject areas

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


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