Carbon Isotope Abundance in Meteoritic Carbonates

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Science  12 Apr 1963:
Vol. 140, Issue 3563, pp. 192-193
DOI: 10.1126/science.140.3563.192


The C13/C12 ratio in the carbonate minerals of Orgueil, a carbonaceous chondrite, is 6 percent greater than the ratio in any known terrestrial carbon. The effect may be produced by a chemical isotope fractionation involving processes not common on earth, or it may be the result of incomplete homogenization of substances with different histories of nucleosynthesis.