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Mineralogical Magazine; August 2004; v. 68; no. 4; p. 541-559; DOI: 10.1180/0026461046840207
© 2004 Mineralogical Society of Great Britain and Ireland
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The minor intrusions of Assynt, NW Scotland: early development of magmatism along the Caledonian Front

K. M. Goodenough1,*, B. N. Young2,3 and I. Parsons4

1 British Geological Survey, West Mains Road, Edinburgh EH9 3LA, UK
2 Department of Geology and Mineralogy, University of Aberdeen, Marischal College, Broad Street, Aberdeen AB24 3UE, UK
3 Baker Hughes Inteq, Barclayhill Place, Portlethen, Aberdeen AB12 4PF, UK
4 Grant Institute of Earth Science, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK

* E-mail: kmgo{at}bgs.ac.uk

The Assynt Culmination of the Moine Thrust Belt, in the northwest Scottish Highlands, contains a variety of Caledonian alkaline and calc-alkaline intrusions that are mostly of Silurian age. These include a significant but little-studied suite of dykes and sills, the Northwest Highlands Minor Intrusion Suite. We describe the structural relationships of these minor intrusions and suggest a classification into seven swarms. The majority of the minor intrusions can be shown to pre-date movement in the Moine Thrust Belt, but some appear to have been intruded during the period of thrusting. A complex history of magmatism is thus recorded within this part of the Moine Thrust Belt. New geochemical data provide evidence of a subduction-related component in the mantle source of the minor intrusions.

KEYWORDS: Assynt, Caledonian, minor intrusion, Moine Thrust, Scotland




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