Mathematics – Logic
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9514789w&link_type=abstract
(American Geophysical Union and Geological Society of America, International Conference on Mars, 4th, Tucson, AZ, Jan. 10-13, 19
Mathematics
Logic
20
Carbon Dioxide, Carbon Isotopes, Mars Atmosphere, Viking Mars Program, Carbonates, Isotope Effect, Kinetic Equations, Mars Surface, Meteorites, Silicates
Scientific paper
Assuming that SNC meteorites derive from Mars, the evolution of atmospheric CO2 on Mars is investigated using literature data on C-13 isotope from SNC meteorites. High-precision isotopic measurements show that there is a 40 vol pct fractionation between carbon associated with silicate minerals and the trapped CO2 gas or carbonate minerals. Trapped CO2 is considered to be a sample of Martian atmospheric gas. The significant difference in isotopic composition between the different components in SNC meteorites was difficult to interpret in terms of closed-system equilibrium or kinetic isotopic fractionation effects. It is suggested that the relative C-13 enrichment in surficial carbon is due to preferential removal of the lighter isotope during an atmospheric loss process.
Grady Michael
Pillinger Colin T.
Wright Ian P.
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