Indigenous primitive carbon in eucrites and diogenites

Details Indigenous primitive carbon in eucrites and diogenites Indigenous primitive carbon in eucrites and diogenites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..443g&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 443.

Computer Science

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Carbon Isotopes, Achondrites, Basalt, Meteoritic Composition, Carbonaceous Materials, Carbon Dioxide, Temperature Dependence

Scientific paper

The carbon contents and isotopic compositions of four eucrites and four diogenites were determined. Stepped heating in an oxygen atmosphere was employed to convert selectively different carbonaceous materials to carbon dioxide gas at various temperature. This technique successfully distinguishes between terrestrial contaminants and indigenous carbon. Eucrites and diogenites contain circa 10-30 ppm of indigenous carbon, with delta C-13 ranging from -29 to -19 percent. The data demonstrate that the carbon contents of basaltic achondrites determined previously (Gibson et al., 1971), circa 500-5000 ppm, are too high by one to two orders of magnitude. The reason for this discrepancy is the failure of the earlier study to take account of terrestrial contamination, which is by far the major carbon component in these samples.

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