Computer Science
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988rspta.325..545w&link_type=abstract
(Royal Society, Discussion on the Solar System: Chemistry as a Key to its Origin, London, England, July 15, 16, 1987) Royal Soci
Computer Science
150
Planetary Composition, Planetary Mass, Terrestrial Planets, Chondrites, Earth Mantle, Geochemistry, Mars (Planet), Meteoritic Composition
Scientific paper
The high concentrations of moderately siderophile elements (Ni, Co, etc.) in the Earth's mantle and the similarity of their CI normalized abundances to those of moderately volatile elements (F, Na, K, Rb) and some elements such as In, which under solar nebula conditions are highly volatile, are striking. To account for the observed abundances, inhomogeneous accretion of the Earth from two components has been proposed. In this model accretion started with the highly reduced component A devoid of all elements more volatile than Na, followed by accretion of more and more oxidized material (component B), containing all elements in CI abundances. Recent observations have brought almost conclusive evidence that SNC meteorites are martian surface rocks ejected by huge impacts. By assuming that Mars is indeed the parent body of SNC meteorites, the bulk composition of Mars is estimated. The data on the composition of Mars obtained in this way clearly show that the two-component model is also valid for Mars.
Dreibus Gerlind
Waenke Heinrich
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