Thermal evolution of earth and moon growing by planetesimal impacts

Mathematics – Logic

Scientific paper

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Earth Environment, Earth-Moon System, Lunar Evolution, Planetary Evolution, Protoplanets, Astronomical Models, Atmospheric Entry, Impact, Thermal Environments, Artificial Impacts, Thermal Properties, Evolution, Earth, Mixing, Moon, Energy, Planetesimals, Size Distribution, Kinetics, Models, Volatilization, Heating, Terrestrial Planets, Isotopes, Accretion, Monte Carlo Technique, Velocity, Melting

Scientific paper

Improved estimates of impact energy partitioning are combined with models of planetesimal size distribution and planetary growth to infer the early thermal evolutions of the earth and moon. Binary accretion models of the moon which allow for enhancement of velocities by proximity of the earth do not get hot enough for appreciable melting unless a planetesimal mass distribution starting at a rather high value (earth mass/20 or more) is assumed. This melting occurs deeper than is inferred from petrological and thermotectonic data; hence the results favor formation of the moon as a consequence of a great impact (or great impacts) into the earth.

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