A stable carbon isotopic study of types 1 and 2 carbonaceous chondrites

概要

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Fourteen C1 and C2 carbonaceous chondrites were studied by a technique of stepped combustion in order to distinguish differences in the abundance, distribution and isotopic composition of refractory (600°<T<1300℃) carbon fractions. Specifically, the distribution and abundance of ^<13>C-rich carbonaceous matter was qualitatively investigated to provide data on diagnostic patterns and intergroup relations, and to identify possible differences between Antarctic and non-Antarctic C1 and C2 meteorites. The data reveal that the C1 and C2 groups possess different carbon isotope profiles, which could be useful as an aid to classification. Furthermore, the carbon isotope profiles for Antarctic and non-Antarctic C2 meteorites are dissimilar, suggesting fundamental differences in the sources sampled by the two groups, or alternatively, that an Antarctic weathering process has affected C2 meteorites residing within and on the ice sheets.
国立極地研究所の論文