Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.111..537r&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 111, no. 2-4, July 1992, p. 537-555.
Computer Science
19
Earth Mantle, Geochemistry, Lunar Geology, Lunar Rocks, Siderites, Glass, Lunar Composition, Melting, Volatility
Scientific paper
Numerical modeling of the impact of a giant planetesimal on the protoearth, resulting, according to a contemporary theory, in the formation of the moon, shows that most of the material now in the moon would have been derived from the mantle of the impactor. This is contradicted by the geochemical evidence provided by the Apollo 15 and 17 lunar volcanic glasses, which implies that the moon is composed mainly of material derived from the terrestrial mantle. It is proposed here that protolunar material may have been removed from the earth's mantle by impacts from one or more high-velocity planetesimals composed mainly of ices and derived from the outer solar system. The impacts ejected material from the earth's mantle as jets of molten matter which was rapidly quenched, thereby retaining a large proportion of its terrestrial volatile inventory.
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