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1 Department of Geology, Oxford Polytechnic, Oxford OX3 0BP, UK
2 Department of Geology, Imperial College, London SW7 2BP, UK
3 School of Geological Sciences, Kingston Polytechnic, Kingston-upon-Thames KT1 2EE, UK
The North Armorican composite terrane, NW France, is a collage of displaced terranes which result from the amalgamation of Cadomian continental arcs and marginal basin complexes by sinistral transpression along a continental margin above a subduction zone. Early Cadomian arc activity occurred at c. 700-650 Ma, but terrane accretion did not occur until c. 540 Ma, and post-tectonic magmatism persisted well into the Palaeozoic. Cadomian events thus span a considerably greater period than previously supposed.
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