The carbon and nitrogen isotopic composition of ureilites Implications for their genesis

Details The carbon and nitrogen isotopic composition of ureilites Implications for their genesis The carbon and nitrogen isotopic composition of ureilites Implications for their genesis

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..903g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, April 1985, p. 903-915. Research supported by the Science and Enginee

Computer Science

25

Carbon Isotopes, Meteoritic Composition, Nitrogen Isotopes, Ureilites, Combustion, Diamonds, Graphite, Olivine, Meteorites, Carbon, Nitrogen, Isotopes, Compostion, Ureilites, Genesis, Samples, Meteorite, Analysis, Procedure, Thermal Effects, Temperature, Combustion, Diamond, Graphite, Parent Bodies, North Haig, Abundance, Element Ratios, Comparisons

Scientific paper

Stepped combustion is used to determine C and N isotopic compositions in 14 and 5 ureilites, respectively. The results are presented in tables and graphs and characterized in detail. Relatively constant values of delta-(C-13) are found at 500-1000 C in each meteorite, indicating that the diamond components formed from the graphite components under conditions such as impact which did not cause isotopic fractionation. Among the ureilites, two groups with delta-(C-13) near -10 and -2 per mil are identified and found to correspond to the groups identified by Berkley et al. (1980) on the basis of the Fe content of their olivine components; this finding suggests formation from more than one ureilite parent body. Wide variations are found in the N isotopic compositions, with N abundances ranging from 25 to 150 ppm and much lower C/N ratios than in carbonaceous chondrites.

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