Cosmogenic helium in a terrestrial igneous rock

Details Cosmogenic helium in a terrestrial igneous rock Cosmogenic helium in a terrestrial igneous rock

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..435k&link_type=abstract

Nature (ISSN 0028-0836), vol. 320, April 3, 1986, p. 435-439.

Physics

65

Abundance, Extraterrestrial Matter, Helium Isotopes, Igneous Rocks, Cosmic Rays, Heating, Olivine

Scientific paper

New helium isotopic measurements on samples from the Kula formation of Haleakala volcano of Hawaii are presented that are best explained by an in situ cosmogenic origin for a significant fraction of the He-3. Results from crushing and stepwise heating experiments, and consideration of the exposure age of the sample at the surface and the cosmic ray fluxes strongly support this hypothesis. Although crustal cosmogenic helium has been proposed previously, this represents its first unambiguous identification in a terrestrial sample.

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