Devonian, orogen-parallel, opposed extension in the Central Norwegian Caledonides

Late orogenic, Early to Middle Devonian extension in the Scandinavian Caled onides was unidirectional in western Norway. New data from two detachment z ones (Hoybakken and Kollstraumen) north of the More-Trondelag Fault Complex show that bidirectional, opposed, orogen-parallel extension dominated in t his region. At this time, the fault complex acted as a transfer zone for th e Hoybakken detachment. Extension and uplift in central Norway triggered si gnificant magmatic activity, in contrast to the lack of granite intrusions during exhumation of western Norway.