Preferential formation of the atmosphere-sialic crust system from the upper mantle

Details Preferential formation of the atmosphere-sialic crust system from the upper mantle Preferential formation of the atmosphere-sialic crust system from the upper mantle

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.278..156h&link_type=abstract

Nature, vol. 278, Mar. 8, 1979, p. 156-159. Research supported by the Oregon Department of Human Resources

Other

15

Argon Isotopes, Atmospheric Composition, Degassing, Earth Atmosphere, Earth Crust, Earth Mantle, Basalt, Earth Planetary Structure, Ocean Bottom

Scientific paper

Evidence is presented to support the concept of concurrent transfer of elements to the atmosphere and sialic crust preferentially from the upper mantle. It is shown that partial melting associated with spreading ridges and Benioff zones exclusively in the upper mantle is responsible for the accretion of continents and the associated degassing of argon to the atmosphere. Model calculations are performed which indicate that the concept of preferential formation of the atmosphere-sialic crust system from the upper mantle can account for the empirical observations that: (1) Ar-40 concentrations in rapidly quenched glassy margins of deep-sea pillow basalts are too low for many estimates of the K concentration in the mantle; (2) the Ar-40/Ar-36 ratio of rocks derived from the deep mantle is similar to the atmospheric ratio; and (3) the upper mantle under oceanic ridges is depleted in K and other large-ion-lithophile elements.

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