Diffusion in MgO at high pressure: Implications for lower mantle rheology

Details Diffusion in MgO at high pressure: Implications for lower mantle rheology Diffusion in MgO at high pressure: Implications for lower mantle rheology

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1095i&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 7, p. 1095-1098

Physics

7

Mineral Physics: Creep And Deformation, Tectonophysics: Rheology-Mantle, Physical Properties Of Rocks: Plasticity, Diffusion, And Creep, Mineral Physics: Elasticity And Anelasticity

Scientific paper

Theoretical calculations of diffusion in periclase were performed to model the rheological properties of the lower mantle. Gibbs free energy values derived from molecular dynamics simulations using a non-empirical interatomic potential to accurately predict diffusion in MgO at zero pressure. Diffusion coefficients were computed for pressures and temperatures up to 140 GPa and 5000 K. We find that Mg vacancies required for diffusive transport are likely extrinsic (due to impurities), and the resulting O vacancies would then be too few to support bulk O transport. Estimates of viscosity from these results are consistent with those inferred for the lower mantle from geophysical observations if grain boundary diffusion is responsible for O transport.

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