Inheritance of magma ocean differentiation during lunar origin by giant impact

Physics

Scientific paper

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Earth-Moon System, Impact Melts, Impactors, Magma, Oceans, Planetary Evolution, Silicates, Angular Momentum, Earth Planetary Structure, Fractionation, Iron Compounds, Moon, Nickel Compounds

Scientific paper

The giant impact model for the Moon has won widespread support. It seems to satisfactorily explain the high angular momentum of the Earth-Moon system, and the strong depletion of FeNi in the Moon. This model is usually assumed to entail no significant fractionation of nonvolatile lithophile elements relative to a simple binary mixture of impactor silicates plus protoearth silicates. Although the Earth may have been hot enough before the impact to be completely molten, analysis of the likely number and timing of major impacts in the prehistory of the impactor indicates that a fully molten, undifferentiated condition for that relatively small body is unlikely. Given selective sampling by the giant impact, any significant vertical differentiation within the noncore portion of the impactor would have been largely inherited by the Moon.

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