Nitrogen and Noble Gases in Mineral Separates from Zagami

Details Nitrogen and Noble Gases in Mineral Separates from Zagami Nitrogen and Noble Gases in Mineral Separates from Zagami

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002usnc.conf...53s&link_type=abstract

Unmixing the SNCs: Chemical, Isotopic, and Petrologic Components of the Martian Meteorites, p. 53-54

Mathematics

Logic

Isotopes, Mineralogy, Nitrogen, Snc Meteorites, Rare Gases, Argon, Mars Surface, Cosmology, Viking Mars Program, Pyroxenes, Mars Atmosphere, Mars (Planet), Achondrites, Neon Isotopes

Scientific paper

Isotopic compositions of nitrogen and noble gases have played a key role in understanding SNC meteorites and Mars. For example nitrogen and argon data from the glass of EET 79001 were one of the convincing evidences that linked these meteorites to Mars. Similarly, the observation of components with largely different isotopic compositions (of both nitrogen and noble gases in these meteorites has led to the realization that the martian atmosphere (as measured by Viking) is quite different from the martian interior (as pictured from data from these meteorites). But at the same time we have not yet been able to clearly define the (interior) mantle end member and reduce the uncertainties presented by the Viking data for the martian atmosphere. Similarly we do not know for sure the Ne-20/Ne-22 signature of Mars. It is clear that many of these ambiguities as to the indigenous martian components result from interferences from cosmogenic contributions and terrestrial contamination, which are impossible to avoid. But they can be minimized by step temperature heating, and selection of mineral phases rather than bulk samples. We have initiated a simultaneous nitrogen and noble gas isotopic study of mineral separates and a few bulk samples from martian meteorites with the newly set up experimental facility at Mainz. Here we report data for maskelynite and pyroxene separates from Zagami.

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