A non-collisional, accretionary Sveconorwegian orogen - Comment

In a stimulating contribution, Slagstad et al. (2013) propose to interpret the 500-km-wide Sveconorwegian orogen in Scandinavia as a non-collisional, accretionary orogen. They challenge the more widely held view that it is the product of a late Mesoproterozoic to early Neoproterozoic continent–continent collision, formed during welding of supercontinent Rodinia. We question the model proposed by Slagstad et al. (2013) as it fails to integrate the lithotectonic and tectonometamorphic framework of the entire orogen, in particular the present-day eastern parts where the principal records of high-pressure metamorphism and collisional tectonics have been retrieved.