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The minor intrusions of Assynt, NW Scotland : early development of magmatism along the Caledonian Front

By K.M. Goodenough, B.N. Young and I. Parsons

Abstract

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. \u

Topics: Earth Sciences
Publisher: Mineralogical Society of Great Britain and Ireland
Year: 2004
DOI identifier: 10.1180/0026461046840207
OAI identifier: oai:nora.nerc.ac.uk:14001

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