Abstract
Nd isotope data indicate derivation of 0.9 Ga old post — tectonic granites from acid gneisses. Both granites and gneisses consist of material accreted ∼1.5 Ga ago from a depleted mantle source (∈Nd(T) ∼5.5). A Sm-Nd whole — rock isochron age of 1190 +/− 37 Ma from the Rjukan metavolcanics is believed to date their extrusion; the initial ratio (∈Nd(T) = 2.1 +/− 0.7) suggests depleted — mantle — derived magma contaminated by 1.5 Ga old crust. Basic Bandak volcanics also comprise depleted — mantle — derived magma (∈Nd(T) ∼7) variably contaminated by older,acid rocks. The acid Bandak volcanics were derived essentially from 1.5 Ga old crust. Combined with published results, the data suggest gradual mantle depletion and complementary crustal growth for at least 3.8 Ga.
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Menuge, J.F. (1985). Neodymium Isotope Evidence for the Age and Origin of the Proterozoic of Telemark, South Norway. In: Tobi, A.C., Touret, J.L.R. (eds) The Deep Proterozoic Crust in the North Atlantic Provinces. NATO ASI Series, vol 158. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5450-2_26
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DOI: https://doi.org/10.1007/978-94-009-5450-2_26
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