Oblique Terrane Assembly in the Late Paleoproterozoic during the Labradorian-Gothian Orogeny in Southern Scandinavia

The earliest deformation of the curved Kongsberg-Bamble Belt in Norway produced a northwestward-directed tectonic wedge, suggesting oblique NW-SE collision during the Labradorian-Gothian Orogeny in southern Scandinavia. Oblique terrane assembly, with the outboard (western) units colliding last, explains the trapping of the Ostfold-Marstrand island arc (formed at c. 1760 Ma) between younger (1700-1600 Ma) terranes, the apparent lack of Svecofennian crust west of the Trans-Scandinavian Igneous Belt, and the apparent lack of Labradorian-Gothian age crust in the British Isles. The Labradorian of North America may have also resulted from oblique terrane assembly.