Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa

Daisuke Yamazaki; Tetsuo Irifune

doi:10.1016/S0012-821X(03)00534-X

Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa

Daisuke Yamazaki, Tetsuo Irifune

Research output: Contribution to journal › Article › peer-review

45 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 (Fe_0.5,Mg_0.5)O samples by electron microprobe analysis, and the Fe-Mg interdiffusivities were determined as D_Fe-Mg= D₀ _Mg)/RT}, where D₀ =4.1(^+16.1 _-3.3)×10^-7 m²/s, E^* =(1-C_Mg)E^*_Fe+C_Mg 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 language	English
Pages (from-to)	301-311
Number of pages	11
Journal	Earth and Planetary Science Letters
Volume	216
Issue number	3
DOIs	https://doi.org/10.1016/S0012-821X(03)00534-X
Publication status	Published - Nov 30 2003
Externally published	Yes

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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10.1016/S0012-821X(03)00534-X

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title = "Fe-Mg interdiffusion in magnesiow{\"u}stite up to 35 GPa",

abstract = "Fe-Mg interdiffusivities in (Fe,Mg)O magnesiow{\"u}stite 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 magnesiow{\"u}stite 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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author = "Daisuke Yamazaki and Tetsuo Irifune",

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doi = "10.1016/S0012-821X(03)00534-X",

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T1 - Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa

AU - Yamazaki, Daisuke

AU - Irifune, Tetsuo

PY - 2003/11/30

Y1 - 2003/11/30

N2 - 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.

AB - 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.

KW - High-pressure experiment

KW - Interdiffusion

KW - Lower mantle

KW - Magnesiowüstite

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Fe-Mg interdiffusion in magnesiowüstite up to 35 GPa

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Keywords

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