Mathematics – Logic
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5419a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E3, p. 5419-5426.
Mathematics
Logic
10
Carbonaceous Chondrites, Earth Mantle, High Pressure, Melting, Planetary Evolution, Differentiation, Earth Core, Phase Diagrams, Solidification
Scientific paper
Phase equilibria of carbonaceous chondrite and phase density relations at high pressure govern a simple model for solidification of an initially molten chondritic Earth involving differentiation stages characterized by particular, experimentally predicted, petrologic processes that dominate the distribution of chemical components during a specific evolution interval. The differentiation stages, which may actually be overlapping segments in the cooling and crystallization continuum of Earth formation, are in chronological order: (1) sulfide liquid-silicate liquid immiscibility leading to protocore formation; (2) magnesiowustite fractionation at the base of the early mantle; (3) perovskite flotation and fractionation in the midmantle; (4) olivine flotation in the shallow mantle; and (5) garnet flotation in the prototransition zone. Compositional layering produced by the five experimentally predicted differentiation stages obeys mass balance and is consistent with a shallow mantle source for peridotite xenoliths, a transition zone rich in garnet at about 540 km, a lower mantle with a superchondritic Si/Mg, and a core of Fe-Ni-S-O.
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