Physics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...38...70o&link_type=abstract
Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 38, March 30, 1985, p. 70-80.
Physics
65
Earth Mantle, Magma, Ocean Bottom, Planetary Evolution, Stratification, Convection, Crystallization, Fractionation, Geochemistry, Melting, Silicates, Temperature Distribution
Scientific paper
The fractional crystallization behavior of a magma ocean extending to mantle depths of up to 1000 km is deduced from published estimates of melting relations for the deep mantle, and from geochemical studies of the density relationships between ultrabasic liquid and mantle minerals. It is found that: (1) the density crossover between ultrabasic liquid and olivine is about 10 GPa; (2) the fractionation of eclogite and perovskite during accretion produces a lower mantle with SiO2-rich composition and a magma ocean with ultrabasic composition from which the present mantle was formed; and (3) geophysical constraints of the present upper mantle are more consistent with a chemically-stratified upper mantle, in which a garnet-rich layer with a thickness of 200 km is overlaid by a garnet depleted layer.
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