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Abstract
Zircons from a fine-grained granite dyke, penetrating a supracrustal sequence in the Ellenö area, crystallized about 1558 Ma ago, post-dating the supracrustal deposition and the general gneissification of the underlying granitoids. The Rb-Sr systems of the dykes in the area have been disturbed, probably by metasomatic reactions between dykes and country rocks during later metamorphic event(s). The intrusive character of some other medium-grained small granite stocks relative to the supracrustals of the area is not unambiguous, but Rb-Sr data indicate a probable emplacement about 1400 Ma ago.