Decoupled evolution of Nd and Sr isotopes in the continental crust and the mantle

Details Decoupled evolution of Nd and Sr isotopes in the continental crust and the mantle Decoupled evolution of Nd and Sr isotopes in the continental crust and the mantle

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.336..733g&link_type=abstract

Nature (ISSN 0028-0836), vol. 336, Dec. 29, 1988, p. 733-738.

Physics

27

Earth Crust, Earth Mantle, Geochemistry, Geochronology, Neodymium Isotopes, Strontium Isotopes, Chemical Evolution, Radioactive Age Determination, Sediments

Scientific paper

It is shown here that Sm-Nd studies, particularly of clastic sediments, provide a basis for understanding Rb-Sr isotopes in the continental crust. Nd and Sr isotopes evolve independently in clastic sedimentary rocks and the continental crust as a whole, because Sr is recycled preferentially from the continents to the mantle. As a result, the differentiation age of the mantle inferred from Sr isotopes and the mean Rb-Sr age of the continental crust are younger than their true ages.

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