Nitrogen isotope geochemistry of basaltic glasses: implications for mantle degassing and structure?

Details Nitrogen isotope geochemistry of basaltic glasses: implications for mantle degassing and structure? Nitrogen isotope geochemistry of basaltic glasses: implications for mantle degassing and structure?

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..81..163e&link_type=abstract

Earth and Planetary Science Letters, Volume 81, Issue 2-3, p. 163-174.

Computer Science

19

Scientific paper

The nitrogen isotope geochemistry of 15 basaltic glasses has been investigated using stepped heating and high sensitivity static vacuum mass spectrometry. At low temperature (< 600°C) the glasses release small amounts of nitrogen with δ15NAIR, averaging -0.3‰, suggesting surficial adsorption of atmospheric nitrogen. At high temperature, usually with a maximum at 1000°C, indigenous nitrogen with a concentration ranging from 0.2 to 2.1 ppm is released. The δ15N values of this high temperature release show a wide range from -4.5‰ to +15.5‰. There is no correlation between N ppm and δ15N, and the samples apparently form 3 groups with distinctive δ15N. Six MORB glasses from the Mid-Atlantic Ridge, East Pacific Rise and Juan de Fuca Ridge define a group with δ15N = +7.5 +/- 1.3‰. In contrast two Indian Ocean MORB glasses (Carlsberg Ridge and Gulf of Aden) gave negative δ15N averaging -3.2‰. Glasses from Loihi Seamount have high δ15N averaging +14.0 +/- 1.0‰. Comparison of the δ15N data with the mantle models derived from helium and argon isotope studies suggests that the wide range in δ15N may reflect in part heterogeneities in the mantle related to its degassing history. It is possible, however, that magmatic degassing processes have also affected nitrogen isotopic compositions, and the data cannot yet be unambiguously interpreted in terms of source variations.

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