Some Puzzles About What Noble Gas Components Were Mixed into the Nakhlites, and How

Details Some Puzzles About What Noble Gas Components Were Mixed into the Nakhlites, and How Some Puzzles About What Noble Gas Components Were Mixed into the Nakhlites, and How

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002usnc.conf...57s&link_type=abstract

Unmixing the SNCs: Chemical, Isotopic, and Petrologic Components of the Martian Meteorites, p. 57-58

Mathematics

Logic

Nakhlites, Rare Gases, Snc Meteorites, Geochronology, Mineralogy, Mars Atmosphere, Argon, Xenon, Shergottites, Volatility, Mars Surface

Scientific paper

Nakhlites, the intermediate-aged (approximately 1300 Ma) Martian meteorites, are similar to one another in noble gas characteristics, as well as mineralogy, but distinct from other Martian meteorites. There are also are subtle differences among the well-studied nakhlites (Nakhla, Lafayette, and Governador Va ladares), which may be important in understanding the processes affecting Martian volatiles. This abstract will summarize some noble gases properties of Martian meteorites, particularly nakhlites, and then highlight five unanswered questions. To first order, Xe in these meteorites appears to be a mixture of an interior component, seen mostly clearly in Chassigny, and an atmospheric component seen mostly clearly in shergottites like EETA 79001. Nakhlites are rich in the atmospheric component (Nakhla being the richest), but the component appears to be elementally fractionated, with a higher Xe/Kr ratio than the (atmospheric) component seen in EETA 79001. Nakhlite Ar has been studied most in the context of Ar- Ar age experiments. All three appear to be about 1300 Ma old, but with some disturbances to the system, most noticeable in Nakhla. Shergottites all appear to have either incorporated variable amounts of two different Ar components (interior and atmosphere?), to have incorporated different components from one another, or to have incompletely degassed upon formation.

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