Computer Science
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.112..101w&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 112, no. 1-4, Aug. 1992, p. 101-116.
Computer Science
8
Chemical Composition, Hypervelocity Impact, Lunar Evolution, Magma, Silicates, Chondrites, Lunar Composition, Perovskites, Planetary Evolution
Scientific paper
It is pointed out that the implication of the popular giant impact model of lunar origin (e.g., Hartmann and Davis, 1975; Cameron and Ward, 1976; Stevenson, 1987) is that any depth-related silicate differentiation within the impactor (and/or the earth) at the time of the impact must be partly inherited by the preferentially peripheral matter that forms the moon. This paper presents calculations of the magnitude of the net differentiation of the protolunar matter for a variety of elements and scenarios, with different assumptions regarding the geometries of the 'sampled' peripheral zones, the relative proportions of the earth-derived to impactor-derived matter in the final moon, and the degree to which the impactor mantle had crystallized prior to the giant impact. It is shown that these differention effects constrain the overall plausibility of the giant impact hypothesis.
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