The granite complex of the Mourne mountains, on the northeast coast of Ireland, was intruded into Silurian shales during the Tertiary. It consists of four distinct intrusions, three in the eastern part and one in the western. In this study, new chemical and petrographic data are given for the three eastern granites. Generally, the granite is a highly siliceous biotite-bearing rock of uniform character, although the first intrusion was less siliceous, more variable, and contained hornblende.

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