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Title:
The earth's core formation due to the Rayleigh-Taylor instability
Authors:
Ida, Shigeru; Nakagawa, Yoshitsugu; Nakazawa, Kiyoshi
Affiliation:
AA(Tokyo, University, Japan), AB(Tokyo, University, Japan), AC(Tokyo, University, Japan)
Publication:
Icarus (ISSN 0019-1035), vol. 69, Feb. 1987, p. 239-248. (Icarus Homepage)
Publication Date:
02/1987
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
Earth Core, Geophysical Fluids, Liquid Metals, Planetary Evolution, Taylor Instability, Planetary Gravitation, Planetary Rotation, Rayleigh Scattering, Silicates
DOI:
10.1016/0019-1035(87)90103-5
Bibliographic Code:
1987Icar...69..239I

Abstract

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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