Braathen et al. (2000) described Early to Middle Devonian extensional faults around the central Norway basement window, one of many tectonic windows exposing basement in the Scandinavian Caledonides (here these basement rocks are called tectonic window basement). Extension was orogen parallel, with top-to-west-southwest (Høybakken) and top-to-east-northeast (Kollstraumen) detachments on opposite sides of the central Norway basement window. From the broad parallelism of the faults and the central Norway basement window margin, Braathen et al. (2000) inferred basement doming was caused by bidirectional extensional nappe unloading (Fig. 1A). However, although the extensional structures are accepted, their role in basement...

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