Computer Science
Scientific paper
May 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.1295d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 37, Issue 5, pp.1295-1319
Computer Science
7
Scientific paper
The carbon isotopic composition of graphite inclusions and finely dispersed carbon from twelve iron meteorites has been studied. The analyses are given as parts permil deviations from the PDB standard. Forty-five analyses of inclusion-graphites from four coarse-grained octahedrites fall in the range from - 4.8 to - 8.2 ; within some of the inclusions a C 13 depletion toward the rim of the nodules is observed. Finely dispersed, residual carbon from four coarse octahedrites, obtained by dissolving the meteorite, shows distinctly lighter isotopic compositions ranging from -5.6 to -24.1%., probably representing a mixture of small inclusions and flakes as well as carbon contained in carbides or in solid solution in the nickel-iron. Graphite inclusions showing C 13 concentrations outside the above range for inclusion-graphites were found in 1. (1) two octahedrites with silicate inclusions, i.e., Four Corners (- 4.0%.) and Pine River (- 8.7%.). 2. (2) the hexahedrite Kendall County (-13.3 to -14.4%.). 3. (3) the `ataxite' Dayton (-11.5 to -11-8%.). This suggests that the average carbon isotopic composition may not be identical for all iron meteorites. The large variability in the C 13 concentration encountered within individual irons contrasts with the isotopic constancy of sulfur observed in meteorites. It is proposed that the differences in the isotope distribution patterns of the two elements may be understood on the basis of the chemical phase relationships in the system Fe-Ni-S-C. However, while C 13 variations within a meteorite may be discussed within this framework, little can be said as yet about possible causes for the suggested differences in C 13 concentrations between different meteorites.
Deines Peter
Wickman Frans E.
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