Stress and deformation analysis in the Norwegian Barents Sea in relation to Paleogene transpression along the Greenland-Eurasia plate boundary

Abstract

<p><span><span>Cenozoic small-scale contractional structures are widespread in the Norwegian (west) and Russian (east) Barents Sea. While the exact dating of the deformation is unclear, it can only be inferred that the contraction is younger than the early Cretaceous. One likely contractional mechanism is related to Greenland plate kinematics at Paleogene times. We use a thin plate finite element modelling approach to compute stresses and deformation within the Norwegian Barents Sea in response to the Greenland-Eurasia relative motions at Paleogene times. The analytical solution for the 3-D folding of sediments above basement faults is used to assess possibilities for folding. Two existing Greenland plate kinematic models, differing slightly in the timing, magnitude and direction of motion, are tested. Results show that the Greenland plate’s general northward motion promotes growing anticlines in the Norwegian Barents shelf. Folding is more likely in the northern Norwegian Barents Sea than in the south. Folding is correlated with the Greenland plate kinematics through time: model M2 predicts a main phase of contraction at earliest Eocene while model M1 predicts contraction a bit later in the Eocene. Both models successfully explain folding above NW-SW Timanian trended faults in the southern Norwegian Barents Sea and above SSW-NNE Caledonian-trended faults in the north. We conclude that Paleogene Greenland plate kinematics are a likely candidate to explain contractional structures in the Norwegian Barents Sea. </span></span></p>