A section across the Norwegian Caledonides; Bodø to Sulitjelma.

Abstract

Between coastal regions near Bodø and the relatively well-known Sulitjelma area on the Norwegian-Swedish border a number of metasedimentary sstructural units have been distinguished lying above an apparently region-wide granite gneiss basement. Basement is revealed in two sets of culminations along the fold belt and at least in this traverse basement domes are present only as far east as the whole cover is high grade. Western basement culiminations have an entirely Caledonian structure but eastern ones sometimes contain structures older than those in the cover. In the west the lowest rocks of the cover generally are concordant on the basement and at least pseudo-autochthonous (described then as conjunctive).They are overlain by the disjunctive Beiarn nappe. To the east of this nappe there are several structural-lithological sub-units which thin to nothing to the west replacing one another ass elements of local structural sequences. (In the Fauske region such sub-units are conjunctive). The upper part forms our version of the Gasak (Rødingsfjell) nappe (disjunctive to the east). The lower part belongs almost entirely to the Køli division of Swedish geologists and is conjunctive on the basement of the western side of the eastern culminations but the east is separated from basement not only by a thin and probably autochthonous sequence.