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A new high precision, U-Pb date from the oldest known rocks in southern Britain

By D.I. Schofield, I.L. Millar, P.R. Wilby and J.A. Evans

Abstract

A new high precision U–Pb zircon age of 710.8 ± 1.5 Ma for\ud granophyric granitic rock from the Stanner Hanter Complex\ud of the Welsh Borderland lies just within error of an older\ud Rb–Sr isochron age. εNd values of −0.3 and −1.2 combined\ud with TDM of 1394 Ma and 1468 Ma indicate that the magma\ud incorporated an older crustal source component. The Nd\ud data highlight differences with western Avalonia, the widely\ud considered Late Neoproterozoic north American counterpart\ud to southern Britain, and point toward a closer similarity\ud with other Peri-Gondwanan terranes that incorporate older,\ud cratonic source material

Publisher: Cambridge University Press
Year: 2010
DOI identifier: 10.1017/S001675680999063X
OAI identifier: oai:nora.nerc.ac.uk:9431

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