Nordfjord-Sogn Detachment

The Nordfjord—Sogn Detachment (NSD) is a major extensional shear zone in Norway up to 6 kilometres (3.7 mi) in thickness, which extends about 120 kilometres (75 mi) along strike from the Nordfjord to the Sognefjord, bringing Devonian continental coarse clastic sedimentary rocks into close contact with eclogite facies metamorphic rocks of the Western Gneiss Region. It formed towards the end of the Caledonian Orogeny and was mainly active during the Devonian. It has an estimated displacement of at least 70 kilometres (43 mi) and possibly as much as 110 kilometres (68 mi). It was reactivated during the Mesozoic and may have influenced the development of fault structures in the North Sea rift basin.

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