Jurassic stratigraphy and tectonics of the south-southeastern Norwegian offshore

Abstract

Three major Early - Middle Jurassic unconformities in the Fiskebank Sub-Basin are represented by a hiatus in the Central Graben. The axial North Sea dome collapsed in Late Callovian, initiating the Central Graben, and causing coarse clastic sedimentation near topographic highs. The facies developments within the Norwegian-Danish Basin are controlled by the Lista Ridge. Anaerobic conditions are typical of the Late Jurassic, but highly radioactive shales are found only in the Central Graben and the Fiskebank Sub-Basin. A Mid-Volgian transgression established a seaway connection between these basins. Fifteen lithostratigraphic units are mapped. Evidence of strike-slip faulting in the Farsund Sub-Basin, and of halokinetic effects on the Jurassic sedimentation are presented.