Reaction of iron and silica at core-mantle boundary conditions

Details Reaction of iron and silica at core-mantle boundary conditions Reaction of iron and silica at core-mantle boundary conditions

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..146..243d&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 146, Issue 1-2, p. 243-247.

Physics

Scientific paper

Chemical interaction between iron and silica have been studied at pressures up to 140GPa and temperatures over 3800K in electrically- and laser-heated diamond anvil cells and in multianvil apparatus. At pressures below 55-60GPa and high temperatures, iron and silica react to form iron oxide and iron-silicon alloy with up to 5wt.% Si. However, at pressures from 85 to 140GPa reaction between iron and SiO2 was not detected. Our results suggest that the silicon-rich alloy produced by re-equilibration of proto-core metal that equilibrated with silicates in a magma ocean, or produced at the CMB by reaction between iron and silicate will accumulate at the boundary between the lower mantle and core.

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