KINEMATIC STRATIFICATION IN THE HINTERLAND OF THE CENTRAL SCANDINAVIAN CALEDONIDES

A transect through west-central Norway illustrates the changing geomet ry and kinematics of collision in the hinterland of the central Scandi navian Caledonides. A depth section through the crust is exposed on Fo sen Peninsula, comprising three tectonic units separated by two shear zones. The lowest unit, exposed in the Roan window, is a modestly defo rmed, Caledonian granulite complex framed by a subhorizontal decolleme nt, with NW-SE oriented lineations and kinematic indicators showing to p-to-the-northwest transport. The middle unit, the Vestranden gneiss c omplex, contains Telict granulites, but was penetratively deformed at amphibolite facies to produce an orogen-parallel family of structures during translation on the decollement. Shallow plunging lineations on steep schistosities are subparallel to fold axes of the dominant, upri ght, non-cylindrical folds. A small component of sinistral strike slip is also recorded. In contrast, southernmost Fosen Peninsula contains an abundance of cover rocks infolded with Proterozoic basement in a fo ld nappe, with shallow, E-dipping schistosities, down-dip lineations, and orogen-oblique, top-to-the-west shear sense indicators. A NE-Strik ing, sinistral shear zone separates the gneisses from southern Fosen. Deformation in the Scandian hinterland was partitioned both in space a nd time, with orogen-parallel extension and shear at middle structural levels and orogen-oblique transport at shallower levels.