Other
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.314..248c&link_type=abstract
Nature (ISSN 0028-0836), vol. 314, March 21, 1985, p. 248-250. Research supported by the Science and Engineering Research Counci
Other
86
Carbon Dioxide, Mars Atmosphere, Meteoritic Composition, Carbon Isotopes, Mass Spectroscopy, Weathering
Scientific paper
Stepped combustion analyses of SNC meteorites, which are postulated to have originated on Mars, are described. The results show that most of the carbon present in the samples can be ascribed to terrestrial contamination. EETA79001, however, contains 4.6 ppm of an isotropically distinct component enriched in C-13 (delta C-13 = +36 per mil), whereas high-temperature carbon of inferred igneous origin in this meteorite and other SNCs has a delta C-13 value of about -30 per mil. The C-12/C-13 ratio of the isotopically heavy component is within the error limits of Viking measurements in the Martian atmosphere, and thus strengthens the case for a planetary origin. Another carbon-containing species, believed to be carbonate, has been found in Nakhla (delta C-13 between +12 and +24 per mil) and may be a product of atmospheric weathering on Mars.
Carr Robert H.
Grady Michael
Pillinger Colin T.
Wright Ian P.
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