Computer Science
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..698k&link_type=abstract
Nature (ISSN 0028-0836), vol. 302, April 21, 1983, p. 698-700. Sponsorship: Ministry of Education, Science and Culture.
Computer Science
20
Argon Isotopes, Earth Mantle, Geochemistry, Helium Isotopes, Rare Gases, Chemical Composition, Diffusion Coefficient, Plumes, Structural Properties (Geology)
Scientific paper
Determinations of He-3/He-4 and Ar-40/Ar-36 ratios in samples from midoceanic basaltic and mantle-plume formations are used to rule out some hypothetical models of layered mantle structure. Plume-type samples are characterized by high He-3/He-4 ratios and low Ar-40/Ar-36 ratios, compared to midoceanic-types, although each individual sample is considered to represent a mixture of the two ideal types. Mechanisms of mixing and degassing are considered in terms of the models of mantle structure. The noble-gas data are held to support a model in which a primitive fertile mantle underlies a depleted mantle, so that plumes may arise either from greater depth (containing high amounts of He-3) or from the shallower depleted mantle (containing less He-3); the second type is assumed to be subject to contamination by crustal materials.
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