The origin of macrorhytmic units in the Lower Zone of the Lille Kufjord Intrusion, northern Norway.

Abstract

The Lille Kufjord intrusion is one of the youngest mafic plutons in the Seiland Magmatic Province which forms part of the Middle Allochthon of the North Norwegian Caledonides. It was emplaced at a mid-crustal level into Proterozoic, sillimanite-grade paragneisses during the Middle Cambrian, probably in an extensional tectonic regime. Caledonian deformation is locally penetrative in the envelope but the intrusion is little affected and retains its original form, orientation and synformal internal structure.