Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...15..541t&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Physics
Deposition, Earth Planetary Structure, Geotemperature, Heat Transfer, Planetary Evolution, Lunar Evolution, Magma, Earth, Structure, Thermal Properties, Accretion, Energy, Segregation, Core, Thermal Effects, Melting, Evolution, Heat Transfer, Magma Ocean, Calculations, Heat Flux, Depth, Mantle, Liquidus, Pressure, History
Scientific paper
The energy associated with the accretion of the earth and the segregation of the core is more than sufficient to melt the entire earth. In order to understand the thermal evolution of the early earth it is necessary to study the relevant heat transfer mechanisms. In this paper the existence of a global magma ocean is postulated and calculations are carried out of the heat flux through it in order to determine its depth. In the solid mantle heat is transferred by the upward migration of magma. This magma supplies the magma ocean. The increase in the mantle liquidus with depth (pressure) is the dominant effect influencing heat transfer through the magma ocean. It is found that a magma ocean with a depth of the order of 20 km would have existed as the earth accreted. It is concluded that the core segregated and an atmosphere was formed during accretion.
Pflugrath J. C.
Turcotte Donald L.
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