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Abstract
The Sundsta granite is a reddish acidic granite, situated in the Western Pregothian mega-unit in Värmland, south-western Sweden. Its Rb-Sr whole-rock age is 1566 ±39 Ma with an initial ratio of 0.705 ±0.003. The region is dominated by grey, migmatized granitoids presumably belonging to the Åmål-I group which has ages of 1650–1700 Ma. The marked difference in degree of migmatization between these two rock-units may indicate that the intrusion of the Sundsta granite post-dates the main migmatization phase of the Åmål-I granitoid in this region.