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Journal of the Geological Society; 1990; v. 147; issue.6; p. 927-930;
DOI: 10.1144/gsjgs.147.6.0927
© 1990 Geological Society of London

SHORT PAPER

Evidence for Silurian sinistral accretion of Avalon composite terrane in Canada

R. DOIG1, R. D. NANCE2, J. B. MURPHY3 & R. P. CASSEDAY2

1 Department of Geological Sciences, McGill University, 3450 University Avenue, Montreal,Quebec H3A 2A7, Canada
2 Department of Geological Sciences, Ohio University, Athens, Ohio 45701, USA
3 Department of Geology, St Francis Xavier University, Antigonish, Nova Scotia B2G 1C0, Canada

The Kingston dyke complex forms a regionally developed belt of sheeted bimodal dykes within the Avalon composite terrane of southern New Brunswick, Canada. Dyke orientation relative to the belt suggests their injection accompanied sinistral movement, and the belt has previously been attributed to transform activity within the late Precambrian magmatic arc regime typical of the Avalon composite terrane in the Northern Appalachians. However, rhyolite dykes of the sheeted complex yield a U-Pb age of 435.5 ± 1.5 Ma that is interpreted to date their emplacement. The complex therefore provides evidence of Early Silurian sinistral displacement in the Northern Appalachians. Such movement is suggested by palaeomagnetic data and may record the accretion of the Avalon composite terrane to cratonic North America.




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