Et langt fremskjøvet "jotundekke" i Rendalen.

Abstract

In the central part of the sparagmite district of eastern Norway, three augen- gneiss areas have been known since long ago. T\u00CErnebohm (1896) suggested that the Månkampen area and the Ottlaua area were parts of the complicated \"Koppang nappe\". During field investigations in Rendalen 1942-43 the present author, contemporaneously with Chr. Oftedahl at Månkampen in Glåmdalen, discovered coarse-grained anorthositic rocks at the base of the Ottlaua massif. Stressed gabbroic rocks also occur together with the anorthosites. The anorthosites of the Ottlaua complex consists of very coarse-grained, slightly altered labradorite and scattered pseudomorphs after a dark mineral, possibly rhomic pyroxene. In other places, white albite-clinoxoisite-schists occur and these seem to be stressed equivalents of anorthosites. The Ottlaua rocks form a cup-shaped complex folded deep down into the sparagmites. The main rock types are coarse-grained augen-gneisses and granitic gneisses, locally cut by doleritic dikes. Near the base gabbroic schists occur. It soon became clear that the rocks of the Ottlaua complex do not belong to the sparagmite system, but that they are closely related to the rocks of \"the lower nappe\".