Multiple nitrogen isotopic components co-existing in ureilites.

Details Multiple nitrogen isotopic components co-existing in ureilites. Multiple nitrogen isotopic components co-existing in ureilites.

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..857y&link_type=abstract

Meteoritics & Planetary Science, vol. 33, no. 4, pp. 857-870.

Computer Science

7

Scientific paper

Nitrogen and noble gas isotopic compositions and carbon abundance of ureilites were analyzed using a stepwise combustion technique. Four Antarctic ureilites, ALHA-77257, Asuka-881931, Yamato-791538 and Yamato-790981 were analyzed. Multiple nitrogen isotopic components were observed in these ureilites. The (15N values of these nitrogen components ranged from +160 to -120e. The minimum (15N values of typically -120e were observed at combustion temperatures where large amounts of carbon were released, at 700-900oC. A heavy nitrogen component was observed in only two ureilites, ALHA-77257 and Asuka-881931. Silicate enriched fractions and carbon concentrated fractions were prepared for these two ureilites. We conclude that both the light nitrogen and the heavy nitrogen are trapped in the carbonaceous vein minerals. The lack of correlation between the N/C ratio and the 36Ar/C ratio suggests that the primary carrier phase of the light nitrogen does not correspond to that of the planetary noble gases. We consider that the isotopically heavy nitrogen which was observed in this study is related to the heavy nitrogen observed among polymict ureilites. Small amounts (<0.5ppm) of light nitrogen with the minimum (15N value of -120e were observed among the silicate fractions at the highest combustion temperature of 1200 oC, although the exact carrier phase of this light nitrogen is not known. We consider that the currently observed ureilites were produced by injection of several volatile-rich objects into volatile-poor ureilitic silicates.

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