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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

Strachan, R.A.; Evans, Jane. 2008 Structural setting and U–Pb zircon geochronology of the Glen Scaddle Metagabbro: evidence for polyphase Scandian ductile deformation in the Caledonides of northern Scotland. Geological Magazine, 145 (3). 361-371. 10.1017/S0016756808004500

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Abstract/Summary

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

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1017/S0016756808004500
Programmes: BGS Programmes 2008 > NERC Isotope Geoscience Laboratory
ISSN: 0016-7568
NORA Subject Terms: Earth Sciences
Date made live: 28 Jan 2010 15:31
URI: http://nora.nerc.ac.uk/id/eprint/9172

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