Computer Science
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.305..403h&link_type=abstract
Nature (ISSN 0028-0836), vol. 305, Sept. 29, 1983, p. 403-407.
Computer Science
16
Abundance, Basalt, Earth Mantle, Plumes, Rare Gases, Argon Isotopes, Degassing, Helium Isotopes, Mass Ratios, Ridges, Silicates
Scientific paper
Data is presented to demonstrate that the Reykjanes Ridge of Iceland features glasses that contain a noble-gas component originating from a nondegassed mantle source. Attention is focused on the argon and helium isotopic composition of three glassy basalts dredged from 800-1000 m depth on the Ridge. Analyses were performed of the He-3, Ar-40, Ne-20, Kr-84, Xe-132, and He-4 concentrations and ratios. Several ratios are found to be up to 1,000,000 times as high as in the atmosphere, indicating that atmospheric contamination did not touch the Ridge surface, in contrast to previously acquired samples from Hawaii basalts. Crushing experiments with the Ridge basalts revealed that the measured He-4/Ar-40 and He-4/Ar-36 ratios are predictable by a closed system model which indicates that primordial noble gases in the Iceland mantle plume are remnants left after atmosphere degassed from the midocean ridge basalts.
Dymond Jack
Hart Russell
Hogan Lewis
Schilling Jean-Guy
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