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Variscan sourcing of Westphalian (Pennsylvanian) sandstones in the Canobie Coalfield, UK

By Andrew Morton, Mark Fanning and Neil Jones

Abstract

The zircon age spectrum in a sample from the Canonbie Bridge Sandstone Formation\ud (Asturian) of southern Scotland contains two main peaks. One is Early Carboniferous in age (348–\ud 318 Ma), and corresponds to the age of igneous activity during the Variscan Orogeny. The other is of\ud late Neoproterozoic to early Cambrian age (693–523 Ma), corresponding to the Cadomian. Together,\ud these two groups comprise 70 % of the zircon population. The presence of these two peaks shows\ud unequivocally that a significant proportion of the sediment was derived from the Variscides of western\ud or central Europe. The zircon population also contains a range of older Proterozoic zircons and a small\ud Devonian component. These could have been derived from the Variscides, but it is possible that some\ud were locally derived through recycling of northerly derived sandstones of Devonian–Carboniferous\ud age. The zircon age data confirm previous suggestions of Variscide sourcing to the Canonbie area,\ud made on the basis of petrographical, heavy mineral and palaeocurrent evidence, and extend the known\ud northward distribution of Variscan-derived Westphalian sediment in the UK

Topics: Earth Sciences
Publisher: Cambridge University Press
Year: 2010
DOI identifier: 10.1017/S0016756810000014
OAI identifier: oai:nora.nerc.ac.uk:11261

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