Physics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..90..263d&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 90, no. 3, Nov. 18, 1988, p. 263-271.
Physics
14
Abundance, Earth Crust, Geochemistry, Geochronology, Neodymium Isotopes, Samarium Isotopes, Graphite, Magma, Rare Earth Elements
Scientific paper
Data on Nd-143/Nd-144 values from granitoid rocks emplaced into the continental crust samples of different ages were used to deduce the Sm/Nd ratio of the crust, which is a sensitive indicator of the REE pattern. It was found that the values of the Sm/Nd ratio in the granite magma sources in the continental crust increase with decreasing age from the Early Archean to the Late Proterozoic, the trend which is opposite to that inferred for the crust from the REE patterns in sedimentary rocks. The isotopic data, combined with the crustal age distribution, indicate that the Sm/Nd value of the bulk continental crust is not lower than 0.60 times the chondritic value. This limit and the estimates of the Nd concentration of the crust (which are between 20 and 25 ppm) are consistent with the mass balance that equates the Nd in the continents to that missing from the upper mantle down to a depth of about 700 km.
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