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Mid-Eocene renewal of magmatism in NW Scotland the Loch Roag Dyke, outer hebrides

  • Amonchquite 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 Ar-40/Ar-39 plateau age of 45.2 +/- 0.2 Ma (2 sigma) 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.

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Author:J. W. Faithfull, Martin J. Timmerman, B. G. J. Upton, M. S. Rumsey
ISSN:0016-7649 (print)
Parent Title (English):Journal of the Geological Society
Publisher:Geological Soc. Publ. House
Place of publication:Bath
Document Type:Article
Year of first Publication:2012
Year of Completion:2012
Release Date:2017/03/26
First Page:115
Last Page:118
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften
Peer Review:Referiert