The Sveconorwegian orogen (1.1–0.9 Ga), covering southern Norway, is known for its large pegmatite province containing more than 5000 pegmatite bodies, divided into several pegmatite fields (Fig. 1). Most of these pegmatites have a chemical niobium-yttrium-fluorine (NYF) signature. The orogen is intruded by several, large post-orogenic A-type granites that classically were thought to be the source of the pegmatite melts. This was first challenged by Müller et al. (2015) stating that some of the pegmatites were formed by anatectic melting of their amphibolitic host-rock.

In this study we use U-Pb age dating of columbite group minerals and...

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