Rare gases from the undepleted mantle?

Details Rare gases from the undepleted mantle? Rare gases from the undepleted mantle?

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.305..298f&link_type=abstract

Nature (ISSN 0028-0836), vol. 305, Sept. 22, 1983, p. 298-300. NSF-supported research.

Computer Science

9

Earth Mantle, Geochemistry, Rare Gases, Abundance, Argon Isotopes, Depletion, Hawaii, Helium Isotopes, Nodules

Scientific paper

The implications of measurements of He-4, Ar-40, and Ar-36 concentrations in two Hawaiian ultramafic modules are discussed with regard to the concept of a depleted/undepleted mantle system. It was postulated that rare gas isotopic composition and abundances would be different in continental and plume areas compared to the abundances in oceanic glasses. It is shown that argon can easily diffuse from the nodules during transport to the surface and cooling of the host basalt. Both Ar isotopes would be depleted, while He/Ar isotope ratios would be lowered by the post-magmatic diffusion losses. Attention was also given to measurements of the isotope abundances made by Kaneoka and Takaoka (1978) for both nodules and phenocrysts from the same basalts. It was concluded that the nodules and phenocrysts did not arise from a depleted mantle, but were affected by mass-dependent loss and addition processes, and that no evidence exists that atmospheric contamination does not affect the abundances in the nodules.

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