Abstract
Sm—Nd isotope systematics of Lewisian gneisses from North-west Scotland suggest that their igneous calc-alkaline precursors separated from previously undifferentiated mantle 2,920±50 Myr ago. Approximately 200 Myr elapsed before this material was finally differentiated and stabilised as granulite and amphibolite fades crust.
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Hamilton, P., Evensen, N., O'Nions, R. et al. Sm—Nd systematics of Lewisian gneisses: implications for the origin of granulites. Nature 277, 25–28 (1979). https://doi.org/10.1038/277025a0
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DOI: https://doi.org/10.1038/277025a0
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