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Journal of the Geological Society; 1996; v. 153; issue.5; p. 669-672;
DOI: 10.1144/gsjgs.153.5.0669
© 1996 Geological Society of London

Article

Geochemistry and petrogenesis of volcanic clasts in the Permian breccias around Exeter

N. T. AWAD1, J. R. MEREFIELD2, R.C. SCRIVENER3 & M. STONE2

1 Earth Sciences Department, National Research Centre, Dokki, Cairo, Egypt
2 Earth Resources Centre, University of Exeter, Exeter EX4 4QE, UK
3 British Geological Survey, St. Just, 30 Pennsylvania Road, Exeter EX4 6BX, UK

Geochemical comparisons between volcanic clasts from the late Permian red beds and various granite plutons and granite porphyries ('elvans') from SW England show that the clasts have closest affinity with the poorly megacrystic granite of Dartmoor and the 'elvan-like' Godolphin granite. This affinity with the Dartmoor granite backs up recently published {varepsilon}Nd data and age determinations. It is concluded that the clasts represent volcanic material derived from an evolving subsurface granitic magma, thereby conforming with conclusions/ideas of earlier workers for the former presence of a Dartmoor volcano.


Keywords: Permian, Devonshire England, clasts, geochemistry.




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