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1 results

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

  • K. M. Goodenough, B. N. Young, I. Parsons
  • Journal:
    Mineralogical Magazine / Volume 68 / Issue 4 / August 2004
    Published online by Cambridge University Press:
    05 July 2018, pp. 541-559

  • 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.