Other
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.141..307m&link_type=abstract
Earth and Planetary Science Letters, vol. 141, Issue 1-4, pp.307-313
Other
6
Dhajala Meteorite, N-15/N-14, Noble Gases, Pyrolysis, Elsevier: Dhajala Meteorite, N-15/(N-14), Noble Gases, Pyrolysis
Scientific paper
An acid residue from the Dhajala meteorite which carries the noble gas component of the pure Q-phase, has been analyzed for nitrogen and noble gases by step-wise heating pyrolysis. From Ne data we derive (20/22)Q = 10.48 ± 0.15. A nitrogen content of 48 ppm with 15 N = -15 in all temperature fractions except for a small fraction (0.26%) of N in 1200°C with 15 N = -55 has been observed. The sharp fall in the 15 N for the 1200°C fraction, in all likelihood, is due to the signature of microdiamonds in Dhajala. We calculate an abundance of ~ 30 ppb for microdiamonds in Dhajala. The uniform 15 N of -15 in all other temperature fractions is interpreted as the isotopic composition of nitrogen in phase-Q. The peak release of nitrogen occurs at 1400°C, while for the noble gases, the peak release occurs at 1200°C, indicating that nitrogen is more tightly bound in phase-Q as compared to the noble gases.
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