Noble gas contents of shergottites and implications for the Martian origin of SNC meteorites

Details Noble gas contents of shergottites and implications for the Martian origin of SNC meteorites Noble gas contents of shergottites and implications for the Martian origin of SNC meteorites

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1723b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, Sept. 1984, p. 1723-1739.

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38

Mars Atmosphere, Meteoritic Composition, Planetary Evolution, Rare Gases, Achondrites, Cosmic Rays, Isotopic Enrichment, Radiation Effects, Meteorites, Rare Gases, Abundance, Shergottites, Origin, Entrapment, Snc Meteorites, Isotopes, Concentrations, Samples, Meteorite, Mars, Antarctic Meteorites, Elephant Moraine Meteorites, Eeta79001, Argon, Zagami, Allan Hills Meteorites, Phases, Shock, Xenon, Krypton, Isotopic Ratios, Element Ratios, Atmosphere, Comparisons, History, Hypotheses, Cosmic Rays, Classificat

Scientific paper

Three meteorites belonging to the rare group of SNC achondrites, which may have originated in the planet Mars, have been subjected to noble gas isotopic concentration measurements. The elemental and isotopic ratios obtained are unlike those for any other noble gas components except those obtained in analyses of the Martian atmosphere by Viking spacecraft. It is hypothesized that the Kr and Xe gases represent a portion of the Martian atmosphere which was shock-implanted in the case of Elephant Moraine A79001, and that they constitute direct evidence of a Martian origin for the shergottite meteorites. If the SNC meteorites were ejected from Mars at the shergottite shock age of about 180 My ago, they must have been objects more than 6 m in diameter which experienced at least three space collisions to initiate cosmic ray exposure.

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