Nd-Sr isotopic composition of granulites and constraints on the evolution of the lower continental crust

Details Nd-Sr isotopic composition of granulites and constraints on the evolution of the lower continental crust Nd-Sr isotopic composition of granulites and constraints on the evolution of the lower continental crust

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..510b&link_type=abstract

Nature (ISSN 0028-0836), vol. 307, Feb. 9, 1984, p. 510-515.

Computer Science

60

Earth Crust, Geochemistry, Igneous Rocks, Neodymium Isotopes, Strontium Isotopes, Continents, Samarium Isotopes, Statistical Analysis

Scientific paper

In a statistical study of granulite facies rocks, 32 samples with ages ranging from 2,900 to 200 Myr have been analyzed for Sm, Nd, Rb and Sr and Nd-143/Nd-144 and Sr-87/Sr-86 ratios. The Sm/Nd ratio is found to be constant compared with the highly variable Rb/Sr ratio. Using the model age formalism, it is shown that, in many cases, internal differentiation of continental crust follows external differentiation with a large time interval.

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