Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...29..242f&link_type=abstract
(NATO, Advanced Study Institute on Early Evolution of the Planets and their Atmospheres, Newcastle-upon-Tyne, England, Mar. 23-A
Physics
8
Abundance, Argon Isotopes, Earth Mantle, Outgassing, Planetary Evolution, Primitive Earth Atmosphere, Radioactive Age Determination, Convection, Degassing, Diamonds, Glass, Ocean Bottom, Seamounts
Scientific paper
Argon radioactive dating in relation to the study of the development of the mantle and of the atmosphere is reviewed. The consequences of continual degassing versus catastrophic degassing models and of combinations of the two are analytically presented and related to the concept of depleted versus undepleted mantle. The results of argon dating from diamonds, ultramafic xenoliths, and oceanic glasses are compared and discussed. The mantle region feeding the oceanic ridge system and oceanic seamounts seems to have a reasonably unique argon component, characterized by Ar-40/Ar-36 of about 10,000 and Ar-36 of about 1-2 x 10 to the -10 cu cm/g. Atmospheric evolution models based on these data are discordant; the data can be satisfied purely by continual degassing through geologic time, but do not rule out a significant contribution from an early catastrophic event.
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