Computer Science
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.316..716f&link_type=abstract
Nature (ISSN 0028-0836), vol. 316, Aug. 22, 1985, p. 716-718. NSF-supported research.
Computer Science
14
Basalt, Earth Mantle, Geochemistry, Islands, Ocean Bottom, Rare Gases, Abundance, Atmospheric Composition, Degassing, Glass, Isotopes
Scientific paper
Several lines of evidence based on relative rare earth abundances and on strontium, lead, and neodymium isotopic geochemistry have led to the suggestion that the earth's mantle may be divided roughly into a region depleted in volatile components, feeding the mid-ocean ridge basalts, and a less depleted ('undepleted') region which feeds hotspots and thus oceanic island basalts. Models of mantle degassing and atmospheric evolution have been based on differences in argon and xenon isotope ratios measured in samples which supposedly trap rare gases from these two reservoirs. Absolute abundances and elemental ratios corrected for mass fractionation effects are here reported which indicate that partial loss of the depleted mantle component plus addition of an atmospheric Ar and Xe component provide a better rationale for the isotopic differences in these heavy gases than does the postulated undepleted mantle component.
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