Geology of the western and north-eastern part of the Meråker area.

Abstract

A thick metasedimentary sequence together with a volcanic and hypabyssal intrusive complex is described. While strata dip generally westwards it can be shown that the succession is, for the most part, inverted; the discovery of a polymict conglomerate stratigraphically above the volcanic series has helped to confirm this view. In the east, the younger (Silurian) metasediments occupy the core of an asymmetrical syncline, overturned towards the east. Gabbro bodies, mostly sills, occur throughout all except the Silurian rocks: these gabbros are younger than similar basic rocks in the igneous complex. The regional metamorphism of the sequence has been low grade viz. greenschist facies, and is manifested by a well-defined schistosity. Locally, biotite porphyr-oblastesis post-dates this schistosity.