Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6431088 | Earth and Planetary Science Letters | 2008 | 5 Pages |
Abstract
We present results of simultaneous measurements of self-diffusion of oxygen and silicon in magnesium silicate perovskite. Oxygen diffusion is ~ 2 orders of magnitude faster than Si self-diffusion and Fe-Mg interdiffusion in perovskite, with D0 = 9.16 Ã 10â 4 (+ 0.16 / â 9.2 Ã 10â 6) m2/s and Q = 501 ± 80 kJ/mol at 25 GPa. Despite this high O diffusivity, however, the electrical conductivity of the lower mantle will be dominated by electronic conduction and the present-day core is likely to be out of redox equilibrium with the mantle.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth and Planetary Sciences (General)
Authors
David P. Dobson, Ralf Dohmen, Michael Wiedenbeck,