The earth's core formation due to the Rayleigh-Taylor instability

Details The earth's core formation due to the Rayleigh-Taylor instability The earth's core formation due to the Rayleigh-Taylor instability

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...69..239i&link_type=abstract

Icarus (ISSN 0019-1035), vol. 69, Feb. 1987, p. 239-248.

Physics

15

Earth Core, Geophysical Fluids, Liquid Metals, Planetary Evolution, Taylor Instability, Planetary Gravitation, Planetary Rotation, Rayleigh Scattering, Silicates

Scientific paper

A protoearth accretion stage configuration consisting of an undifferentiated solid core, an intermediate metal-melt layer, and an outer silicate-melt layer, is presently taken as the initial state in an investigation of Rayleigh-Taylor instability-induced core formation. The Ida et al. (to be published) quantitative results on the instability in a self-gravitating fluid sphere are used. The instability is found to occur through the translational mode on a time-scale of about 10 hr, in the case where the metal-melt layer is greater than about 1 km; this implies that the earth's core formed due to the undifferentiated solid core's translation upon the outer layer's melting. Differentiation would then have occurred in the late accretion stage.

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