Neodymium Isotope Evidence for the Age and Origin of the Proterozoic of Telemark, South Norway
作者： Julian F. Menuge
DOI: 10.1007/978-94-009-5450-2_26
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摘要: Nd isotope data indicate derivation of 0.9 Ga old post — tectonic granites from acid gneisses. Both and gneisses consist material accreted ∼1.5 ago a depleted mantle source (∈Nd(T) ∼5.5). A Sm-Nd whole rock isochron age 1190 +/− 37 Ma the Rjukan metavolcanics is believed to date their extrusion; initial ratio = 2.1 0.7) suggests derived magma contaminated by 1.5 crust. Basic Bandak volcanics also comprise ∼7) variably older,acid rocks. The were essentially Combined with published results, suggest gradual depletion complementary crustal growth for at least 3.8 Ga.
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