Nitrogen isotopic composition of CK chondrites

Details Nitrogen isotopic composition of CK chondrites Nitrogen isotopic composition of CK chondrites

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30..430s&link_type=abstract

Meteoritics, vol. 30, p. 430 (1995).

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Scientific paper

Nitrogen abundances and isotopic compositions of four CK chondrites (ALH85002, EET92002, Yamato6903 and Karoonda) were measured by a stepped-combustion method. Neon and Ar were also measured for the same samples. Two types of isotopically light N were observed. One of them is labile N released at low temperatures (˜300 °C). This N is observed only in ALH85002. The other N is extracted at high temperatures (900-1200 °C) from all CK chondrites; although, the isotopic compositions are somewhat variable. There is a fair correlation between the excess 15N values and the abundance of trapped 36Ar for the high-temperature component, suggesting presolar origin of these species. The light N (δ15N = -lO6.8%o) observed in Karoonda is one of the lightest N components ever reported for bulk chondrites.

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