Computer Science
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2429s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 11, pp.2429-2432
Computer Science
2
Scientific paper
We have measured elemental and isotopic compositions of light noble gases (He, Ne and Ar) of eight glasses in submarine pillow basalts dredged from the northern Mariana Trough. The 3 He / 4 He ratios are quite uniform with the value of (9.4-10,3) × 10 -6 despite large variations in 4 He contents. The 4 He / 20 Ne ratios vary significantly from 4.6 to 2.1 × 10 5 and the variation is well explained by mixing between mantle-derived and atmospheric noble gases. Based on the 1/ 20 Ne- 4 He/ 20 Ne diagram, the 4 He content in pristine glasses was estimated to be 9.2 × 10 -6 ccSTP/g. A similar correlation is found between the 36 Ar content and the 40 Ar / 36 Ar ratio, which leads to the estimation of the 40 Ar content. The 4 He / 40 Ar ratio is comparable to that in the vesiculated basalt and considerably higher than the radiogenic production ratio in the primary magma. The observed 3 He / 4 He ratios are somewhat lower than that of average MORB and are higher than those of volcanic gases in subduction zones, suggesting the isotopic signature of He in the back-arc basin is distinct from mid-ocean ridges and island arcs.
Ishii Teruaki
Nakamura Yuji
Sano Yuji
Wakita Hiroshi
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