Tectonic Structure of the Central Part of the Barents Sea Shelf (from 2D CDP Reflection Data)

Generalized structural maps of the base Upper Jurassic and the top Low Permian carbonates of the Barents Sea shelf were constructed at a scale of 10,000,000. Disjunctive dislocations on the Shtokman-Lunin Threshold (megasaddle) were defined in the form of the paragenesis of NW- and NE-trending oblique-slip faults, strike-slip reverse faults and strike-slip faults, which had caused the formation of local highs of the pop-up type and depressions of the pull-apart type. Primary oblique-slip faults of the northwestern strike are most probably faults of Paleozoic origination reactivated in the Mesozoic – Cenozoic. Secondary oblique-slip faults are NW-trending, while secondary strike-slip reverse faults are NE-trending. Neotectonic NE-trending stike-slips, which had caused the formation of a superimposed syn-stikeslip system of dislocations in the form of NE-trending normal faults and NW-trending strike-slip reverse faults, were sketched. A tectonic scheme of the middle structural stage of the Barents Sea shelf was constructed at a scale of 1:10,000,000. The structure of the Stockman-Lunin Threshold was defined more exactly, on which five structural terraces separated by syn-strikeslip depressions and complicated by large local anticlinal structures were defined, namely Shtokmanovskaya, Ledovaya, Ludlovsko-Luninskaya, Medvezhya and Vernadskogo.