Ion microprobe analyses of SNC meteorite melt inclusions

Details Ion microprobe analyses of SNC meteorite melt inclusions Ion microprobe analyses of SNC meteorite melt inclusions

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1181r&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 181.

Computer Science

1

Snc Meteorites, Ion Probes, Meteoritic Composition, Mars Surface, Planetary Mantles, Molybdenum, Melting, Inclusions, Geochemistry, Silicates

Scientific paper

Some SNC meteorites, considered to be pieces of Mars delivered to Earth via impact processes, are igneous cumulates, and contain trapped melt within olivine and pyroxene crystals that can yield information about volatiles and preeruptive magmatic conditions. We analyzed melt inclusions from two cumulate SNC meteorites, Chassigny and LEW 88516, to better constrain two aspects of Martian geochemistry. Some of the Chassigny inclusions contain small biotite crystals. The partitioning of Ba between biotite and silicate liquid is pressure-dependent, and thus Ba analyses of both biotite and glass can yield information about the original depth of crystallization of the phases in the melt inclusions. The Mo content of the Martian mantle can be used to infer conditions prevailing during core formation, since Mo is a moderately siderophile element. Mo (and incompatible siderophile elements such as W and P) contents of basaltic rocks are commonly used to estimate the concentrations in the original mantle source, by comparison with a refractory incompatible lithophile element (Ba or Ce). We analyzed the trapped melts to include in a reassessment of the Mo content of the mantle of Mars.

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