Fe-Mg interdiffusion in single crystal olivine at very high pressure and controlled oxygen fugacity: technological advances and initial data at 7 GPa

Details Fe-Mg interdiffusion in single crystal olivine at very high pressure and controlled oxygen fugacity: technological advances and initial data at 7 GPa Fe-Mg interdiffusion in single crystal olivine at very high pressure and controlled oxygen fugacity: technological advances and initial data at 7 GPa

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...70..102b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 70, Issue 1-2, p. 102-118.

Physics

19

Scientific paper

The interdiffusion of iron and magnesium in natural single crystals of San Carlos olivine (Fo90) has been determined using a 2000 ton uniaxial split-sphere apparatus (USSA-2000) and Rutherford back-scattering spectrometry (RBS). Advances in the microanalysis technique made it possible to perform high-pressure experiments for short-duration runs at low temperatures in a controlled chemical and mechanical environment. Olivine crystals were coated with a thin film of fayalite, inserted in an Fe capsule and placed inside an 18 mm pyrophyllite octahedral cell assembly. After experiments at 7 GPa and 900°C for 6 h at pO2 ~ 10-14 bar, the specimens were recovered with very few fractures and chemically unaltered.
Analysis of RBS spectra from these crystals yields a value of DFe-Mg = 10-13.7 cm2 s-1. Comparison of this value with previous data at atmospheric pressure suggests that the activation volume for Fe-Mg interdiffusion is VFe-Mg* ~ 2.2 +/- 0.9 cm3 mol-1 which, if proven correct, has important implications for electrical conductivity and creep in the upper mantle.

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