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The Sveconorwegian orogeny (c. 1 Ga) lead to the recrystallization of large parts of southwestern Sweden, with widespread metamorphism as well as local migmatization. The Idefjorden Terrane, which has been studied less extensively than the nearby Eastern Segment, is divided by the Göta Älv Shear Zone and the Dalsland Boundary Thrust into two main units; the Western and Median Segments. A garnet am
