Stored mafic/ultramafic crust and early Archean mantle depletion

Details Stored mafic/ultramafic crust and early Archean mantle depletion Stored mafic/ultramafic crust and early Archean mantle depletion

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..91...66c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 91, no. 1-2, Dec. 1988, p. 66-72.

Physics

52

Earth Crust, Earth Mantle, Neodymium Isotopes, Volcanoes, Chondrites, Lithosphere, Solar System

Scientific paper

The global Nd isotopic evidence for early mantle depletion, which shows that some enriched reservoir must have persisted for at least 300 Ma in the early Archean, is discussed. Numerical models of the isotopic effects of melt extraction from the mantle are used to show that early oceanic crust is a more likely candidate for the enriched reservoir than early continental crust. It is suggested that subduction of an early mafic/ultramafic crust and temporary storage may be responsible for the depletion and high epsilon(Nd) values of the Archean upper mantle.

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