Precambrian and Caledonian tectonometamorphic evolution of Northeastern Seiland, Finnmark, North Norway.

Abstract

The metamorphic rocks of northeastern Seiland are predominantly Precambrian gneisses and schists. The Fagervik infracrustal complex, composed of tonalitic gneisses, constitutes a basement to the Late Precambrian-Cambrian Klubben Psammite Group, while the Precambrian Eidvågeid supracrustal sequence occurs as the uppermost allochtonous nappe. The Precambrian units contain evidence of Precambrian deformation and metamorphism. The subsequent Caledonian tectonism is characterized by two phases of deformation D1 and D2. A metamorphic climax occurred in the interkinematic period. D1 produced large isoclinal folds and large-scale translation of the nappes. The major D2 structure is large asymmetric synform, the Storbukt Synform, with a vergence towards the southeast.