Computer Science
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992em%26p...57...85l&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 57, no. 2, May 1992, p. 85-97.
Computer Science
Chondrites, Earth-Moon System, Geochronology, Lunar Evolution, Meteoritic Composition, Planetary Composition, Abundance, Angular Momentum, Hypervelocity Impact, Iron Oxides, Mass Ratios
Scientific paper
The giant impact hypothesis for the origin of the moon has been widely accepted. The incorporation of the impactor's metallic core into the earth is an important feature of this hypothesis. The mass of the impactor core was estimated to be 0.19 x 10 exp 27 g or about 1/10 of the earth's core if the mass of the impactor is 0.82 x 10 exp 27 g. The author derived the bulk composition of the earth from CI chondrites, and concluded that the Fe content of his model is low when compared with the present earth. This result may be rationalized by the addition of the impactor core into the proto-earth developed by the author. If as suggested the impactor's mantle contains 14 wt pct FeO, the mass ratio of impactor/proto-Earth should not exceed 0.22. This ratio is not likely to exceed 0.30 if a giant blowoff did not occur during impact. Tables of bulk chemical composition of the earth before and after impact and of the mantle and impactor core are presented. Implications for the origin of the earth are discussed.
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