Reaction between liquid iron and (Mg,Fe)SiO3-perovskite and solubilities of Si and O in molten iron at 27 GPa

T. Kawazoe, E. Ohtani

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The Earth's core contains light elements and their identification is essential for our understanding of the thermal structure and convection in the core that drives the geodynamo and heat flow from the core to the mantle. Solubilities of Si and O in liquid iron coexisting with (Mg,Fe)SiO3-perovskite, a major constituent of the lower mantle, were investigated at temperatures between 2,320 and 3,040 K at 27 GPa. It was observed that Si dissolved in the liquid iron up to 1.70 wt% at 3,040 K and O dissolved in the liquid iron up to 7.5 wt% at 2,800 K. It was also clearly seen that liquid iron reacts with (Mg,Fe)SiO3-perovskite to form magnesiowüstite and it contains Si and O at 27 GPa and at 2,640 and 3,040 K. The amounts of Si and O in the liquid iron are 1.70 and 2.25 wt% at 3,040 K, respectively. The solubilities of Si and O in liquid iron coexisting with (Mg,Fe)SiO3-perovskite have strong positive temperature dependency. Hence, they can be plausible candidates for the light elements in the core.

Original languageEnglish
Pages (from-to)227-234
Number of pages8
JournalPhysics and Chemistry of Minerals
Volume33
Issue number3
DOIs
Publication statusPublished - 2006 May 1

Keywords

  • (Mg,Fe)SiO-perovskite
  • Earth's core
  • Liquid iron
  • Oxygen
  • Silicon

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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