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Volcanic and sedimentary rocks of the Västervik and Valdemarsvik groups along the southern margin of the 1.90–1.85Ga south Svecofennian crustal province in Sweden have been migmatised and intruded by granitoids and gabbros during extension (deformation phase D1), at a depth of at least 10km. Peak metamorphic conditions were reached around 1825Ma. Extension switched to compression before cooling. The...