Other
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..102...40o&link_type=abstract
Icarus (ISSN 0019-1035), vol. 102, no. 1, p. 40-61.
Other
15
Convection, Earth Crust, Earth Mantle, Earth Surface, Magma, Surface Temperature, Venus Surface, Astronomical Models, Temperature Effects, Terrestrial Planets, Planets, Venus, Earth, Numerical Methods, Model, Magmatism, Mantle, Convection, Terrestrial Planets, Temperature, Thermal Effects, Mixing, Chemistry, Parameters, Viscosity, Calculations, Procedure, Surface, Layering, Melting
Scientific paper
A numerical model is used to show that the surface temperature strongly affects the thermal state and chemical structure of the mantle of a terrestrial planet as well as the mode of convection in a coupled magmatism-mantle convection system because of the strong temperature dependence of viscosity. When the surface temperature is sufficiently high and the viscosity at the surface sufficiently low, the mantle becomes chemically layered and the convection occurs as a layered convection. The lower layer consists of a dense enriched material and the upper layer consists of a less dense residue of magma. A sharp chemical discontinuity develops at the boundary between the two layers. Chemical layering gives rise to two types in the magmatism: one induced by the pressure-release melting of the residue in the upper layer and another induced by the pressure-release melting of the enriched material in the lower layer. The application of the model to the Venus mantle and the earth mantle beneath Archean continental crusts is shown.
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