Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa

Details Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.216..301y&link_type=abstract

Earth and Planetary Science Letters, Volume 216, Issue 3, p. 301-311.

Physics

13

Magnesiowüstite, Interdiffusion, Lower Mantle, High-Pressure Experiment

Scientific paper

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=D0exp{-E*(1+PV*Mg/E*Mg)/RT}, where D0=4.1(+16.1-3.3)×10-7 m2/s, E*=(1-CMg)E*Fe+CMgE*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.

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