Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.1135o&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, April 1991, p. 1135-1157, 1159-1172.
Other
30
Geochronology, Lunar Composition, Lunar Evolution, Geochemistry, Selenology, Moon, Origin, Formation, Chemistry, Models, Impacts, Earth, Mantle, Composition, Chondritic Material, Oxidation, Volatiles, Siderophiles, Condensation, Core, Reduction, Silicate, Metal, Temperature, Oxygen, Fugacity, Parameters, Trace Elements, Concentration, Abundance, Iron, Depletion, Refractory Material, Lithophiles, Nickel, Cobalt, Olivine, Orthopyroxene, Sulfur, Partitioning, Vanadium, Chromium, Manganese, Comparisons, Source,
Scientific paper
Assuming that the moon was formed as a result of a giant impact by a celestial Mars-sized body with the earth, a model is developed that accounts for the chemical compositions of both the moon and the earth. The moon model assumes that about 80 percent of the moon came from the primitive earth's mantle after segregation of the earth's core and the other 20 percent came from two sources: (1) the Impactor, which is constrained to be an oxidized undifferentiated body of roughly CI chondritic composition and (2) a late-stage veneer with a composition and oxidation state similar to that of the H-group ordinary chondrites. The earth model assumes that the protoearth accreted from a material resembling a high-temperature condensate from the solar nebula. The model accounts for the siderophile element abundances of the present mantle. It predicts that neither S, O, nor Si were present in sufficient quantities to provide the required light element in the core, whose identity remains enigmatic.
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