Global emissions of helium-3 by subaerial volcanism

Details Global emissions of helium-3 by subaerial volcanism Global emissions of helium-3 by subaerial volcanism

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1479a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 14, July 24, 1992, p. 1479-1481.

Physics

10

Carbon Monoxide, Helium Isotopes, Volcanology, Degassing, Earth Mantle, Mid-Ocean Ridges

Scientific paper

The emission rate of helium-3 by subaerial volcanism is re-evaluated by coupling He-3/CO2 ratios in volcanic gases with new estimate of the flux of carbon dioxide from both arc and nonarc volcanoes. Steady volcanic plume emissions are computed to supply 240-310 mole He-3/yr, most of which is due to nonarc volcanoes. Major eruptions represent minor additions on average, whereas diffuse He-3 emanations through volcanic piles may be important sources. Although not including this contribution, the above figure is equivalent to 20-40 percent of the He-3 flux from mid-ocean ridges and, thus, suggests that primordial He-3 degassing from subaerial volcanic regions may be larger than expected.

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