Abstract
No isotope ages exceeding ∼2,800 Myr have yet been reported from Lewisian gneisses. Furthermore, there is no published isotopic evidence suggesting that Lewisian gneisses incorporate a significant proportion of much older, re-worked sialic crust. Recently, Davies1 has interpreted field evidence from small, discordant amphibolite bodies as indicating a pre-2,800-Myr history of the Lewisian Complex in the type localities of Scourie and Laxford, Sutherland, which is directly comparable with that of the Godthaab area of West Greenland. He has proposed that equivalents of the ∼3,700-Myr-old Amitsoq gneisses and ∼2,800-Myr-old Nuk gneisses can be distinguished, on the tentative assumption that the basic bodies are the equivalents of the Ameralik dykes2–4. This paper tests this hypothesis using Pb isotopes.
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