Computer Science
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.152..101m&link_type=abstract
Earth and Planetary Science Letters, vol. 152, Issue 1-4, pp.101-112
Computer Science
19
N-15/N-14, Noble Gases, Atmosphere, Mantle
Scientific paper
In order to document the isotopic composition of nitrogen in the convective mantle, we have analysed nitrogen isotopes together with argon isotopes in oceanic basalt glasses. Gases were extracted from fluid inclusions by crushing and, after removal of interfering compounds, were analysed by static mass spectrometry. The results show that, of the 25 samples analysed, 12 have 15 N values between -1.4 and -6.5 relative to the atmospheric composition, 8 have 15 N close to 0 , and 5 present enrichments in 15 N (from +2.1 to +5.4 ). A comparison between nitrogen and argon isotopic ratios suggests mixing between a surface-derived component enriched in 15 N and a mantle end-member characterised by extremely high 40 Ar/ 36 Ar ratio and depletion in 15 N of about -3 to ca. -5 relative to atmospheric N. Such isotopic compositions and the very high N/ 36 Ar ratios compared to the atmospheric value of these mantle-derived samples are difficult to reconcile with derivation of atmospheric N 2 from the convective mantle through time, and are more consistent with early volatile fractionation in the Earth-Atmosphere system.
Humbert Franck
Marty Bernard
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