Computer Science
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..875l&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, June 1986, p. 875-887.
Computer Science
9
Achondrites, Evolution (Development), Mars (Planet), Meteoritic Composition, Atmospheric Composition, Hypervelocity Impact, Mars Atmosphere, Mars Surface, Meteorite Collisions, Mineralogy, Petrography, Rare Gases, Thermoluminescence, Meteorites, Snc Meteorites, Shergotty, Eucrites, Achondrites, Chemistry, Origin, Stony Meteorites, Mars, Shergotittes, Nakhlites, Shock Effects, Chassigny, Samples, Meteorite, Diagrams, Petrography, Crystallization Age, Rare Gases, Age Dating, Cosmogenic Material, Nuclides, Fis
Scientific paper
The Shergotty meteorite has a multi-phase (magmatic and shock) history. While the Shergotty picture is complex, consortium studies have advanced the knowledge and understanding of Shergotty and shergottites, nakhlites and Chassigny (SNC) meteorites. Martian origin for the SNC meteorites is strongly favored by several workers from the evidence of trapped noble gases and nitrogen compositions in glasses (lithology C) of the EETA 79001 meteorite, which compare well with the Martian atmosphere analysis made by the Viking Spacecraft. At least two scenarios for the ejection of SNC meteorites are possible: (1) ejection as a large body (>6 m size) by a single impact on Mars and then multiple breakup in the asteroidal belt at about 11 m.y. for Chassigny and nakhlites, at 2.5 m.y. for Shergotty, Zagami and ALHA 77005, and at 0.6 m.y. for EETA 79001; and (2) ejection of small objects (<0.5 m size) by multiple impacts on the Martian terrain at 11, 2.5 and 0.6 m.y. with no breakup in space.
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