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Sm—Nd systematics of Lewisian gneisses: implications for the origin of granulites

Naturevolume 277pages2528 (1979) | Download Citation

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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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Affiliations

  1. Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York, 10964

    • P. J. Hamilton
    • , N. M. Evensen
    •  & R. K. O'Nions
  2. Department of Geological Sciences, The University of Birmingham, Birmingham, UK

    • J. Tarney

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https://doi.org/10.1038/277025a0

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