Physics – Geophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1341j&link_type=abstract
(Conference on Isotope Tracers in Geochemistry and Geophysics, Pasadena, CA, Mar. 23-25, 1987) Geochimica et Cosmochimica Acta (
Physics
Geophysics
15
Earth Crust, Earth Mantle, Planetary Composition, Planetary Evolution, Radioactive Isotopes, Neodymium, Planetary Mass, Radioactive Age Determination, Samarium, Transport Theory
Scientific paper
A formalism for the general treatment of three-layer mantle-crust evolution models is presented and various published models are shown to be special cases of this more general model. The Sm-Nd, Lu-Hf, and Rb-Sr isotopic present-day mass balance for the continental crust-depleted mantle system is consistent with about 30 percent of the mantle being depleted. A growth curve for the continental crust is calculated on the basis of total inversion of the Sm-Nd isotopic data for all of earth history. The curve suggests that by about 3.8 Ga ago, about 40 percent of the present continental volume was present. Both the estimated continental recycling and addition rates show maxima around 3.0 Ga. The resulting continental addition rates were also very high 4.5-4.0 Ga ago and during the Phanerozoic. The Sm-Nd data are not compatible with a steady state model for the crust over the past 2-3 Ga. The major uncertainty in evaluating crust-mantle evolution models is the extent of exchange between the upper and lower mantle.
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