Nitrogen-isotopic compositions of IIIE iron meteorites

Details Nitrogen-isotopic compositions of IIIE iron meteorites Nitrogen-isotopic compositions of IIIE iron meteorites

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..749s&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 4, pp. 749-756 (2000).

Computer Science

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Scientific paper

The compositionally closely related iron-meteorite groups IIIE and IIIAB were originally separated based on differences in kamacite bandwidth, the presence of carbides only in IIIE, and marginally resolvable differences on Ga-Ni and Ge-Ni diagrams. A total of 6 IIIE iron meteorites have been analyzed for C and N using SIMS and 3 of these have also been analyzed for N, Ne and Ar by stepped combustion. We show that these groups cannot be resolved on the basis of N abundances or isotopic compositions, but that they are marginally different in C isotopic composition and nitride occurrence. Cosmic-ray exposure age distributions of IIIE and IIIAB irons seem to be significantly different. There is a significant N isotopic range among the IIIE irons. A negative correlation between ?15N and N concentration suggests that the increase in ?15N resulted from diffusional loss of N.

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