Abstract
THE occurrence of the blue amphiboles glaucophane and crossite in metamorphosed basic rocks is characteristic of terrains metamorphosed at high pressures. Most examples are from relatively recent fold belts. We record here a Caledonian blueschist from the Dalradian Supergroup in South Achill Island, County Mayo (Fig. 1). It is the first ‘Old’ blueschist from Britain to occur in a regularly bedded and folded sequence and may imply an early high pressure metamorphic event in this part of the Dalradian, evidence for which was generally destroyed by either erosion or later metamorphism.
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GRAY, J., YARDLEY, B. A Caledonian blueschist from the Irish Dalradian. Nature 278, 736–737 (1979). https://doi.org/10.1038/278736a0
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DOI: https://doi.org/10.1038/278736a0
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