Sveconorwegian tectonism was related to listric shears (followed by later faults) which ramped from depth, delaminating the crust into major units (the Kongsberg-Bamble Belt, Telemark Sector and Rogaland Vest Agder Sector). During the Post-Kongsbergian anorogenic period (ca. 1 500-1300 Ma), plutonic complexes were intruded, the Rjukan and Seljord Groups of the Telemark Supergroup were deposited, and Fennoscandia rifted from Laurentia. Just before 1250 Ma, Early Sveconorwegian deformations caused a crustal delamination as Fennoscandia rotated. An Inter Sveconorwegian extensional period (ca. 1250- I IOO Ma), with acid and basic intrusions and eruption of the Bandak Group of the Telemark Supergroup, reflected increasing E-W back-arc tension related to subduction further west. The Main Sveconorwegian orogenic phase started (ca. 1 100 Ma) with regional E-W compression and complex deformation related to collision with Laurentia: later deformations, metamorphism and granitic intrusions (between ca. 1050 and 950 Ma) resulted from post-collisional convergence.
l. C. Stormer, Dept. of Geological Sciences, University College London, Gower Street, London WC lE 6BT, UK.