A suite of diabase dikes intrudes granites and migmatites in the northeastern Gander Zone of Newfoundland. Rb–Sr dates on granites pre-dating and post-dating the diabases show that the dikes were emplaced in the Devonian. The mineralogy and the major and minor element chemistry of the dikes indicate that they are alkalic basalts that may have been intruded during a period of tension.

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