Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa

Daisuke Yamazaki, Tetsuo Irifune

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Fe-Mg interdiffusivities in (Fe,Mg)O magnesiowüstite have been measured in experiments conducted at pressures of 7-35 GPa and temperatures of 1573-1973 K using a Kawai-type high-pressure apparatus. The diffusion profiles were measured across the interface between MgO and (Fe0.5,Mg0.5)O samples by electron microprobe analysis, and the Fe-Mg interdiffusivities were determined as DFe-Mg= D0 Mg)/RT}, where D0 =4.1(+16.1 -3.3)×10-7 m2/s, E* =(1-CMg)E*Fe+CMg E*Mg (activation energy for the concentration of Mg, where E*Fe=113(±74) kJ/mol and E*Mg=226(±32) kJ/mol), the activation volume V*Mg=1.8(±1.2)×10-6 m3/mol. By extrapolating these results to the P-T conditions of the core-mantle boundary, we conclude that the interdiffusivity of Fe-Mg in magnesiowüstite at the bottom of the lower mantle is at least one order of magnitude larger than that at the top of the lower mantle.

Original languageEnglish
Pages (from-to)301-311
Number of pages11
JournalEarth and Planetary Science Letters
Volume216
Issue number3
DOIs
Publication statusPublished - Nov 30 2003
Externally publishedYes

Keywords

  • High-pressure experiment
  • Interdiffusion
  • Lower mantle
  • Magnesiowüstite

ASJC Scopus subject areas

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

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