Mid-Eocene renewal of magmatism in NW Scotland: the Loch Roag Dyke, Outer Hebrides

Faithfull, J.W. , Timmerman, M.J., Upton, B.G.J. and Rumsey, M.S. (2012) Mid-Eocene renewal of magmatism in NW Scotland: the Loch Roag Dyke, Outer Hebrides. Journal of the Geological Society, 169(2), pp. 115-118. (doi: 10.1144/0016-76492011-117)

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Publisher's URL: http://dx.doi.org/10.1144/0016-76492011-117


A monchquite dyke, in the vicinity of Loch Roag, Lewis, Outer Hebrides has an unusually enriched chemistry, and contains a unique assemblage of megacrysts and xenoliths from the lithosphere of the Hebridean craton. A 40Ar/39Ar plateau age of 45.2 ± 0.2 Ma (2σ) of a phlogopite megacryst from the dyke overlaps an earlier reported K–Ar age, and confirms that the British Palaeogene Igneous Province extended into the Eocene. Similar late low-volume melts were erupted in the Eocene and Oligocene in West and East Greenland, suggesting that such late-stage magmatic rejuvenescence is a widespread feature across the North Atlantic Igneous Province.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Faithfull, Dr John
Authors: Faithfull, J.W., Timmerman, M.J., Upton, B.G.J., and Rumsey, M.S.
College/School:University Services > Library and Collection Services > Museum and Art Gallery
Journal Name:Journal of the Geological Society

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