Mid/Late Devonian-Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea

Direct 40Ar/39Ar K‐feldspar dating of Late Permian—Early Triassic brittle faulting in northern Norway

“…The geology of the study area (Figure ) is comprised of a Precambrian gneiss complex, the West Troms Basement Complex (WTBC) (Bergh et al., ), which forms a NE–SW‐trending basement horst extending northward on the Finnmark Platform offshore (Koehl et al., ). The WTBC is separated from a stack of Caledonian nappes to the east by Caledonian thrusts and post‐Caledonian brittle normal faults (Andresen & Forslund, ; Indrevær et al., ; Olesen et al., ), and from a series of deep offshore basins filled with Late Palaeozoic to Quaternary sedimentary rocks to the west (Faleide et al., ; Gabrielsen, Færseth, Jensen, Kalheim, & Riis, ; Gudlausson et al., ; Hansen et al., ; Indrevær et al., ; Tsikalas et al., ).…”

“…The dated faulting in the WTBC was part of a widespread Late Permian–Early Triassic rifting event, which has been recognized throughout the North Atlantic and Arctic regions. In the SW Barents Sea, rifting started in the Early‐Mid Carboniferous (Koehl et al., ) and was followed by Mid to Late Triassic post‐rift thermal subsidence and an influx of coastal and alluvial sediments that were probably derived from the Fennoscandian Shield (e.g. Clark et al., ; Gudlausson et al., ; Smelror, Petrov, Larssen, & Werner, ; Torgersen, Viola, Zwingmann, & Harris, ).…”

“…The extensional history of the continental shelf of northern Norway and the Barents Sea is well understood through the study of seismic and well data (e.g. Clark et al., ; Hansen, Bergh, & Henningsen, ; Indrevær, Stunitz, & Bergh, ; Indrevær et al., ; Koehl, Bergh, Henningsen, & Faleide, ; Tsikalas, Faleide, Eldholm, & Antonio Blaich, ), but less is known about the onshore post‐Caledonian history. Constraining the timing of the brittle fault activity and exhumation in the coastal areas of northern Norway is therefore essential for understanding the relationship between offshore and onshore tectonics and the implications for the extensional tectonic history of the North Atlantic margin.…”