ALH 85085 - Nitrogen isotope analysis of a highly unusual primitive chondrite

Details ALH 85085 - Nitrogen isotope analysis of a highly unusual primitive chondrite ALH 85085 - Nitrogen isotope analysis of a highly unusual primitive chondrite

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..97...29g&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 97, no. 1-2, Feb. 1990, p. 29-40. Research supported by SERC.

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Carbonaceous Chondrites, Chemical Analysis, Grain Size, Meteoritic Composition, Nitrogen Isotopes, Antarctic Regions, Solar System, Stony Meteorites, Meteorites, Antarctic Meteorites, Alh Meteorites, Alh 85085, Nitrogen, Isotopes, Chondrites, Laboratory Studies, Samples, Meteorite, Origin, Composition, Chemistry, Analysis, Enrichment, Comparisons, Abundance, Distribution, Brecciation, Procedure, Experiments, Nitrogen 15, Classification, Description

Scientific paper

Results are presented from the nitrogen isotope analysis of the unusual, fine-grained primitive chondrite, ALH 85085. The results are compared with other unusual meteorites, including Bencubbin, Weatherford, and Renazzo. It is found that ALH 85085 has the highest deltaN-15 measured in any whole-rock meteorites. Isotopically heavy nitrogen occurs in two sites in ALH 85085, carbonaceous material and fine-grained Fe-Ni metal or opaque chondritic matrix clasts. The results suggest that a third highly (N-15)-enriched nitrogen carrier might be located in the matrix. It is suggested that isotopically heavy nitrogen mixed with nitrogen of more normal deltaN-15 to produce nitrogen with variable isotopic composition, which was distributed throughout the meteorite during late-stage vaporization and recondensation processes.

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