Nitrogen components in primitive ordinary chondrites

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Scientific paper

Nitrogen and argon in more than twenty primitive ordinary chondrites were studied by a stepped combustion method. Several nitrogen carriers which are characterized by the nitrogen isotopic composition, nitrogen release pattern, and trapped Ar release pattern, are recognized in the primitive ordinary chondrites. Large fractions of anomalous nitrogen and associated argon are removed by acid treatment in most cases. The nitrogen isotopic anomalies cannot be explained by known presolar grains (with a possible exception of graphite) and some of the nitrogen isotopic anomalies may be due to unknown presolar grains. There is no specific relationship between the type of nitrogen carriers contained in an ordinary chondrite and the chemical type (H, L, or LL) of the chondrite. It is likely that the carriers of isotopically anomalous nitrogen were mixed in various parent bodies as rock fragments as a result of impacts, rather than as individual fine particles. The presence of distinctive nitrogen isotopic anomalies in primitive meteorites indecates that, the primitive solar nebula has been heterogeneous either spatially or temporally.

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