The Husfjord plutonic complex, Sørøy, northern Norway.

Abstract

The Husfjord area of Sørøy is underlain by a plutonic complex which has been emplaced into Vendian to Cambrian metasediments during the Finnmarkian phase of the Caledonian orogeny. The metasedemimentary envelope of the complex consists mainly of a sequence of psammits, pelites, semipelites, calc-silicate schists and marbles, which have undergone prolonged regional metamorphism and two principal episodes of deformation. The regional metamorphic event commenced before the first folding episode, reached its peak in the almandine-amphibolite facies between the deformation episodes, and waned during the second period of folding. The various members of the igneous complex were emplaced synchronously with these metamorphic and tectonic events, and thermal metamorphic effects produced by some members have been superimposed upon those of the regional metamorphism. The earliest intrusion, the Husfjord metagabbro, was emplaced towards the end of the first deformation episode, and has been affected by the highest grades of regional metamorphism.