Thermal equilibration of the earth following a giant impact

Details Thermal equilibration of the earth following a giant impact Thermal equilibration of the earth following a giant impact

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991geoji.107..163s&link_type=abstract

Geophysical Journal International (ISSN 0955-419X), vol. 107, Oct. 1991, p. 163-170. Research supported by DFG and Fulbright Fou

Other

8

Earth Surface, Hypervelocity Impact, Impact Melts, Planetary Craters, Planetary Evolution, Thermodynamic Equilibrium, Earth (Planet), Magma, Surface Temperature

Scientific paper

A thermal evolution model for the cooling of a terrestrial planet, a prescribed fraction of which is melted during a giant impact, is described. Two model geometries are considered, one having a laterally inhomogeneous distribution of melt and solid through a mega-crater geometry and the other having a global magma ocean. It is found that almost the whole planet may melt if the impact originally melted half of the planet and if the first melt temperature was double a typical planet melting temperature. For reasonable choices of parameter values it is determined that thermal equilibration of the earth occurs on a time-scale of 1 to ten million years.

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