Constraints on evolution of earth's mantle from rare gas systematics

Details Constraints on evolution of earth's mantle from rare gas systematics Constraints on evolution of earth's mantle from rare gas systematics

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.303..762a&link_type=abstract

Nature (ISSN 0028-0836), vol. 303, June 30, 1983, p. 762-766.

Mathematics

178

Argon Isotopes, Constraints, Earth Mantle, Helium Isotopes, Planetary Evolution, Xenon 129, Basalt, Chemical Composition, Degassing, Glass, Mathematical Models, Oceans, Rare Gases, Ratios, Strata

Scientific paper

Analyses of the isotopic composition of He, Ar and Xe in a suite of glasses from the mid-ocean ridges and from the island of Hawaii show that the Hawaiian samples have systematically lower He-4/He-3, Ar-40/Ar-36, Xe-129/Xe-130 ratios than the mid-ocean ridge basalts. This result is interpreted to imply the existence of an undegassed mantle reservoir. Given the isotopic variations, and the half lives of I-129 and K-40 (parent isotopes of Xe-129 and Ar-40, the undegassed reservoir must have been separated from the MORB source reservoir at least 4400 Myr ago. The most reasonable explanation for the data is therefore the existence of a two-layered mantle.

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