Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.9231s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Aug. 10, 1986, p. 9231-9238.
Physics
52
Fractionation, Geotemperature, Magma, Planetary Evolution, Silicates, Convective Flow, Convective Heat Transfer, Earth Mantle, Metals, Mixing Length Flow Theory, Temperature Distribution
Scientific paper
Using the homogeneous accretion model of planets, the thermal history of the growing earth and the change of its temperature distribution are investigated. It is shown that gravitational differentiation can supply sufficient energy to keep the whole silicate layer in the molten state, and that half of the released energy is conveyed outward by convective heat transport. The central protocore, the metallic layer, and the silicate layer (magma ocean) of the growing earth would become gravitationally unstable and overturn to form a metallic core, and though energy released by this overturn would not significantly effect the structure of the upper magma ocean, the undifferentiated primordial materials coming from the protocore would add to mantle materials through the overturn, explaining the isotropic mantle heterogeneity presently observed.
Nakazawa Kiyoshi
Sasaki Sho
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