Mathematics – Logic
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002usnc.conf....9b&link_type=abstract
Unmixing the SNCs: Chemical, Isotopic, and Petrologic Components of the Martian Meteorites, p. 9-10
Mathematics
Logic
Snc Meteorites, Isotope Ratios, Strontium, Trace Elements, Mars Surface, Planetary Geology, Crystallization, Mars (Planet), Mixing, Earth Crust, Basalt
Scientific paper
Variations in the incompatible trace element and isotopic systematics of the martian meteorites are consistent with mixing of compositionally distinct materials. One end of the mixing array is defined by a component characterized by a strongly light-rare-earth-element depleted pattern, a low Sr-87/Sr-86 ratio, and a high epsilon Nd143 value. In many ways this component is comparable to the Earth's depleted mantle. The second component is characterized by a light-rare-earth-element enriched pattern, a high Sr-87/Sr-86 ratio, and a low epsilon Nd143 value. This component could be analogous to the Earth's crust, or a late stage liquid trapped in the cumulate pile of a magma ocean. The nature of this "enriched" component ultimately underscores whether the compositional variations observed in the martian meteorites reflect differentiation in the crust (i.e. assimilation fractional crystallization) or are inherited from their source regions at the time of melting. Below, fundamental mixing relationships are reviewed and a mechanism to produce the compositional variations observed in the martian meteorites is proposed.
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