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SHORT PAPER |
Department of Earth Sciences, Parks Road, OxfordOX1 3PR, UK
Nd values and clast petrography of the Longmyndian sediments of Shropshire indicate a provenance dominated by juvenile (high Nd(t)) Uriconian volcanic sources, but with an increasing detrital contribution from older (low Nd(t)) metamorphic sources up-section. By contrast, most Lower Palaeozoic strata of England and Wales have low Nd(t)) values, typical of sediments derived from long established continental crust. The Sm–Nd isotopic evidence suggests that Avalonia received sediment from an adjacent large continent in the Cambrian to Lower Ordovician and in the Silurian. Ordovician and Silurian volcanicity supplied juvenile detritus only during and shortly after active volcanism.
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