Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..82...25a&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 82, no. 1-2, March 1987, p. 25-35.
Physics
17
Chemical Evolution, Earth Crust, Earth Mantle, Neodymium Isotopes, Samarium Isotopes, Planetary Evolution, Secular Variations
Scientific paper
Reliable epsilon(Nd) secular evolution curves, produced by a screening of the Sm/Nd data which is aimed at identifying samples most typical of the depleted mantle and the continental crust, show that (for the past 3.8 Ga) 40-50 percent of the total Nd (exclusive of the primitive mantle) has been stored in the continental crust. Data suggest that the crustal growth probably occurs through the addition of strongly light rare earth element (LREE)-enriched magmas derived from the mantle. If the sediment Sm-147/Nd-144 ratio is representative of the mean crustal value, then progressive LREE enrichment in the crust and depletion in the depleted mantle occurred, and if the ratio is 0.13, this ratio and the depleted mantle ratio (0.26) have remained constant. For all the sediment reinjection rates considered, the depleted mantle is shown to form continuously from a primitive reservoir.
Albarède Francis
Brouxel Marc
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