N-15-enriched nitrogen in polymict ureilites and its bearing on their formation

Details N-15-enriched nitrogen in polymict ureilites and its bearing on their formation N-15-enriched nitrogen in polymict ureilites and its bearing on their formation

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.331..321g&link_type=abstract

Nature (ISSN 0028-0836), vol. 331, Jan. 28, 1988, p. 321-323. SERC-supported research.

Computer Science

20

Breccia, Meteoritic Composition, Nitrogen Isotopes, Ureilites, Carbonaceous Chondrites, Enrichment, Pyrolysis, Meteorites, Stony Meteorites, Achondrites, Ureilites, Nitrogen 15, Data, Enrichment, Formation, Samples, Meteorites, North Haig, Parent Bodies, Nilpena, Antarctic Meteorites, Eet Meteorites, Eet 83309, Characteristics, Composition, Isotopes, Analysis, Comparisons, Hypotheses, Brecciation, Origin, Mass Spectrometry, Procedure, Laboratory Studies, Concentration

Scientific paper

Analyses of the nitrogen isotope composition of the three ureilites North Haig, Nilpena, and Antarctic meteorite EET 83309 are presented which show them to be highly enriched in N-15. Measured delta N-15 values reach +540 per mil relative to air, but mass-balance calculations suggest a component of at least +600 per mil. Nitrogen in unbrecciated main-group ureilites does not exhibit such unusual isotopic compositions. At least two nitrogen components exist, and analogies may be drawn with the Bencubbin meteorite, but no definite connection can be made. The authors favor a hypothesis that calls for the introduction of isotopically heavy nitrogen into polymict ureilites during a brecciation event caused by a more primitive, possibly carbonaceous chondritelike projectile.

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