Fe-Ni-S melt permeability in olivine: Implications for planetary core formation

Details Fe-Ni-S melt permeability in olivine: Implications for planetary core formation Fe-Ni-S melt permeability in olivine: Implications for planetary core formation

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414306r&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 14, CiteID L14306

Physics

12

Physical Properties Of Rocks: Permeability And Porosity, Planetary Sciences: Solid Surface Planets: Origin And Evolution, Planetary Sciences: Solid Surface Planets: Physical Properties Of Materials

Scientific paper

A controversial issue in models of planetary core formation concerns whether iron-sulfide melts in contact with silicate minerals at high temperature and pressure form permeable, percolating networks. We address this issue by determining interconnectivity and calculating the permeability of quenched olivine-iron-sulfide partial-melt samples synthesized at high temperature and pressure for a range of melt fractions and two melt compositions using 3D synchrotron radiation computed tomography and lattice-Boltzmann simulations. Permeability ranged from ~10-19 m2 at the lowest concentration of melt (~1% by volume), to ~10-13 m2 at higher concentrations (~13% by volume). Permeability as a function of melt fraction is described by a relation of the form k = αd2 $\phi$ n with a scaling exponent n of 3.6. Our findings, considered a lower bound when compared to larger grained planetesimals, show percolation is a viable mechanism for the migration of FeS melt that may be applicable to models of planetary core formation.

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