Isotopic composition of nitrogen in 'phase-Q'

Murty, S. V. S. (1996) Isotopic composition of nitrogen in 'phase-Q' Earth and Planetary Science Letters, 141 (1). pp. 307-313. ISSN 0012-821X

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/001282...

Related URL: http://dx.doi.org/10.1016/0012-821X(96)00066-0

Abstract

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 δ15N = -15% in all temperature fractions except for a small fraction (0.26%) of N in 1200°C with δ15N = -55% has been observed. The sharp fall in the δ15N 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 δ15N 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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Dhajala Meteorite; N-15/N-14; Noble Gases; Pyrolysis
ID Code:23332
Deposited On:25 Nov 2010 09:15
Last Modified:09 Jun 2011 12:02

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