Abstract

The Galway granite is a homogeneous adamellite over most of the outcrop area along the north side of Galway bay on the west coast of Ireland. On its northern and western borders it shows a reaction zone with the basic rock which it has intruded. On the south, the effects of intrusion and conversion to hornfels are seen in a succession of lavas and graywackes on Gorumna and Lettermullen islands. It is suggested, on the structural evidence, that the granite was emplaced as a diapir and that it, together with its basic envelope, moved upward and outward into the Connemara schists.

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