Heavy nitrogen in Bencubbin - A light-element isotopic anomaly in a stony-iron meteorite

Details Heavy nitrogen in Bencubbin - A light-element isotopic anomaly in a stony-iron meteorite Heavy nitrogen in Bencubbin - A light-element isotopic anomaly in a stony-iron meteorite

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.323..138f&link_type=abstract

Nature (ISSN 0028-0836), vol. 323, Sept. 11, 1986, p. 138-140. SERC-supported research.

Other

36

Chondrites, Iron Meteorites, Meteoritic Composition, Nitrogen Isotopes, Stony-Iron Meteorites, Abundance, Anomalies, Carbon, Chromium, Sulfides

Scientific paper

Bencubbin, an unusual breccia found in Australia, comprising 60 - 75% metal with silicate and chondritic clasts in a shock-welded matrix, has been shown to contain an unprecedented enrichment (by a factor of 2) of 15N, presumably a nucleosynthetic product which escaped homogenization in the solar nebula. Here the authors show that virtually all the nitrogen in Bencubbin is enriched, with a maximum δ15N, of +0,1033%. The nitrogen resides in two acid-resistant components, one more so than the other, which are present in different proportions in the metal and silicate. The more resistant component could be carbonaceous, with an unusually low C:N ratio and without an anomalous carbon isotopic composition (δ13C ≅ +2,5%). Another possible host is a chromium-rich sulphide, which would indicate processing in a supernova.

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