Constraints for a structural subdivision of the Southwest Scandinavian Domain in Sweden

Differences in structural overprinting of rocks east and west of a Sveconorwegian shear zone, the Mylonite Zone, Värmland County, SW Sweden, reveal that this part of the Southwest Scandinavian Domain should be subdivided into different structural domains. We here distinguish the Southwest Scandinavian Domain of eastern Värmland to be affected by Sveconorwegian ductile deformation mainly, where the most prominent structural elements are a foliation and mineral lineations, one of which is associated with open, roughly upright, N–S trending folds. Rocks of western Värmland have a pre-Sveconorwegian deformation history characterized by stromatic veining and isoclinal folding. Subsequent Sveconorwegian thrusting overprints these structures in localised shear zones. One of these is the Mylonite Zone, which roughly marks the eastern border of Gothian folding in this area.