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Journal of the Geological Society; 2008; v. 165; issue.1; p. 333-339;
DOI: 10.1144/0016-76492007-057
© 2008 Geological Society of London

Original Article

New age constraints for the Ordovician Tyrone Volcanic Group, Northern Ireland

M.R. COOPER1, Q.G. CROWLEY2 & A.W.A. RUSHTON3

1 Geological Survey of Northern Ireland, Colby House, Stranmillis Court, Malone Lower, Belfast BT9 5BJ, UK (e-mail: mark.cooper{at}detini.gov.uk)
2 NERC Isotope Geoscience Laboratory, British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
3 Palaeontological Department, The Natural History Museum, Cromwell Road, London SW7 5BD, UK

New biostratigraphical evidence and a high-precision isotope dilution thermal ionization mass spectrometry U–Pb zircon age provide refined age constraint for the Ordovician Tyrone Volcanic Group of the Tyrone Igneous Complex. In a graptolite fauna from Slieve Gallion, the presence of Isograptus victoriae lunatus, the index fossil of the victoriae lunatus graptolite zone, indicates a correlation with the Australasian Castlemainian (Ca1) Stage. The U–Pb zircon age of 473 ± 0.8 Ma dates a volcanic arc-related rhyolite body that is stratigraphically below graptolitic mudstones of Slieve Gallion. The U–Pb isotopic and biostratigraphical age constraints closely match an interpolated age for the base of the Middle Ordovician and indicate a Whitlandian age for the upper Tyrone Volcanic Group, which supports the regional correlation with the Ballantrae Complex, Midland Valley Terrane, Scotland.





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