Computer Science
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992msat.work...67h&link_type=abstract
In Lunar and Planetary Inst., Workshop on the Martian Surface and Atmosphere Through Time p 67-68 (SEE N92-28988 19-91)
Computer Science
Carbon, Composition (Property), Isotopic Labeling, Mars Surface, Meteoritic Composition, Shergottites, Carbon Dioxide Concentration, Ejection, Impactors, Lithology, Mass Spectrometers
Scientific paper
It is now widely accepted that the most likely source of SNC meteorites is Mars. An oblique impact on Mars, or vaporization of permafrost, by an impactor seem to be the most likely ejection mechanisms capable of accelerating material to the 5 km/s velocity needed to overcome the gravitational field of Mars. These ejection mechanisms involve a large shock event in the SNC class, the shergottites EETA 79001 and ALHA 77055 are the most likely shocked samples, in which whole rock pressures of 35 to 45 GPa have been estimated. Martian weathering products have also been identified in EETA 79001. Here, the author started a series of analyses of EETA 79001 using a high-sensitivity static mass spectrometer capable of measuring sub-nanogram quantities of carbon. Recent measurements of lithology C confirm that the shock-implanted atmospheric CO2 is released during the 1100 to 1200 C step.
Hartmetz Christopher P.
Pillinger Colin T.
Wright Ian P.
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