Carbon isotope composition of low molecular weight hydrocarbons and monocarboxylic acids from Murchison meteorite

Details Carbon isotope composition of low molecular weight hydrocarbons and monocarboxylic acids from Murchison meteorite Carbon isotope composition of low molecular weight hydrocarbons and monocarboxylic acids from Murchison meteorite

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..252y&link_type=abstract

Nature (ISSN 0028-0836), vol. 307, Jan. 19, 1984, p. 252-254.

Computer Science

80

Carbon Isotopes, Carbonaceous Chondrites, Carboxylic Acids, Cosmochemistry, Hydrocarbons, Meteoritic Composition, Organic Chemistry, Abundance, Low Molecular Weights, Synthesis (Chemistry), Meteorites, Murchison, Acids, Carbon, Isotopes, Composition, Samples, Meteorite, Hydrocarbons, Carbonaceous Chondrites, Origin, Patterns, Structure, C2 Chondrites, Volatiles, Comparisons

Scientific paper

Carbon isotopic compositions have been measured for individual hydrocarbons and monocarboxylic acids from the Murchison meteorite, a C2 carbonaceous chondrite which fell in Australia in 1969. With few exceptions, notably benzene, the volatile products are substantially isotopically heavier than their terrestrial counterparts, signifying their extraterrestrial origin. For both classes of compounds, the ratio of C-13 to C-12 decreases with increasing carbon number in a roughly parallel manner, and each carboxylic acid exhibits a higher isotopic ratio than the hydrocarbon containing the same number of carbon atoms. These trends are consistent with the kinetically controlled synthesis of higher homologues from lower ones. The results suggest the possibility that the production mechanisms for hydrocarbons and carboxylic acids may be similar, and impose constraints on the identity of the reactant species.

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