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Structural setting and U–Pb zircon geochronology of the Glen Scaddle Metagabbro: evidence for polyphase Scandian ductile deformation in the Caledonides of northern Scotland

By R.A. Strachan and Jane Evans


Within the Scottish Caledonides, the Glen Scaddle Metagabbrowas intruded into the Moine\ud Supergroup of the Northern Highland Terrane after Grampian D2 folding and prior to regional D3 and\ud D4 upright folding and amphibolite-facies metamorphism. A U–Pb zircon age of 426 ± 3 Ma obtained\ud from the metagabbro is interpreted to date emplacement.D3–D4 folding is constrained to have occurred\ud during the Scandian orogenic event. In contrast, polyphase folding and regional metamorphism of the\ud Dalradian Supergroup southeast of the Great Glen Fault is entirely Grampian. These differences are\ud consistent with published tectonic models that invoke a minimum of 700 km of post-Scandian sinistral\ud displacements across the Great Glen Fault to juxtapose the Grampian and Northern Highland terranes

Topics: Earth Sciences
Publisher: Cambridge University Press
Year: 2008
DOI identifier: 10.1017/S0016756808004500
OAI identifier: oai:nora.nerc.ac.uk:9172

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