On the Carlingford peninsula, eastern Eire, Silurian grits and shales have been thermally metamorphosed by a gabbro (eucrite) intrusion of Tertiary age, with the formation of two types of hornfels. The commoner is a pyroxenelabradorite variety, with a chemical composition comparable to a gabbro. It is suggested that the hornfels was was metasomatically altered, that is, made more basic, by the gabbro intrusion.

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