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Journal of the Geological Society

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Terrane analysis along a Neoproterozoic active margin of Gondwana: insights from U–Pb zircon geochronology

^{1 1}School of Earth & Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK (e-mail: rob.strachan@port.ac.uk)
^{2 2}Continental Evolution Research Group, School of Earth & Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia
^{3 3}Tectonics Special Research Centre, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
^{4 4}Present address: Fugro Airborne Surveys Pty Ltd, 65 Brockway Rd, Floreat, WA 6014, Australia
^{5 5}Department of Geological Sciences, Ohio University, Athens, OH 45701, USA
^{6 6}Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, B2G 2W5, Canada
^{7 7}Wapley Ban, Stansbatch, Leominster HR6 9LQ, UK

The tectonic affinities of terranes in accretionary orogens can be evaluated using geochronological techniques. U–Pb zircon data obtained from paragneisses of the Coedana Complex (Anglesey) and the Malverns Complex, southern Britain, indicate that they were deposited during the mid- to late Neoproterozoic and have a comparable Amazonian provenance. Metamorphism of the Coedana gneisses occurred at 666 ± 7 Ma, similar to the age of metamorphism in the Malverns Complex. Anglesey therefore probably evolved in proximity to the Avalonian basement of mainland southern Britain during the mid- to late Neoproterozoic and is not a ‘suspect terrane’ relative to the remainder of Avalonia.

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