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1 Department of Geology Sciences, Queen's University, Kingston, Ontario, Canada K7L 3N6 (e-mail: charbon{at}geol.queensu. ca)
2 Continental Geoscience Division, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada K1A 0E8
3 Petrolab, Old Cowlin s Mill, Penhallick, Cam Brea, Redruth, Cornwall TR15 3RS, UK
The long-controversial age of the Lizard ophiolite is resolved by U-Pb dating of three single magmatic zircons from a plagiogranite dyke near Porthkerris Point. This demonstrates that the axial oceanic crust was undergoing extensional ductile shearing, mylonitization, amphibolite facies metamorphism and, probably, anatexis at 397 ± 2 (2
) Ma. In conjunction with published K–Ar, 40Ar–39Ar and Rb–Sr data for the complex, this Early Devonian age predicates a protracted interval between intra-oceanic magmatism and deformation, on the one hand, and obduction during Late Devonian, northwestward displacement of the Normannian High, on the other.
Keywords: Cornwall England, Hercynian Orogeny, ophiolite, U–Pb, plagiogranite.
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