Nitrogen isotopic composition of a gas-rich ordinary chondrite, ALHA-77216

Details Nitrogen isotopic composition of a gas-rich ordinary chondrite, ALHA-77216 Nitrogen isotopic composition of a gas-rich ordinary chondrite, ALHA-77216

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.125..323s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 125, no. 1-4, p. 323-339

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3

Argon Isotopes, Chondrites, Chronology, Cosmochemistry, Cosmology, Meteoritic Composition, Neon Isotopes, Nitrogen Isotopes, Solar System, Abundance, Cosmic Rays, Mass Spectrometers, Solar Wind

Scientific paper

Nitrogen abundance and isotopic composition in a gas-rich chondrite ALHA-77216 (L3 or H3) was measured in order to obtain an independent estimate of the average nitrogen isotopic composition of the solar system. Nitrogen, Ne and Ar were extracted, by a stepped combustion method, and measured using a static mass spectrometer. The cosmic ray exposure age based on the Ne-21 abundance is about 35.3 +/- 1.1 million yr. Isotopically heavy nitrogen is observed at 700-1100 C. The abundance in a bulk sample is 1.38 ppm with 0.61 ppb excess N-15, of which 0.17 ppb could be due to cosmogenic nitrogen. Heavy nitrogen is enriched in the metal phases compared with silicates. A delta-N-15 value as large as 174% was observed for a the 800 C step of a magnetic separate. The abundance ratio of nitrogen to solar type rare gases in this meteorite is higher than those in lunar samples. We suggest that the isotopically heavy nitrogen is of solar origin, but other possibilities (presolar and indigenous nitrogen) cannot be completely ruled out.

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