Indications of neotectonic activity at the Barents Sea shelf |
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| Authors: | R B Krapivner |
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| Institution: | (1) ZAO GIDEK, Pyatnadtsataya Parkovaya ul. 10a, Moscow, 105203, Russia |
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| Abstract: | Geologic-geomorphic and structural indications of neotectonic, virtually present-day, activity at the Barents Sea shelf are considered. Wide belts of the secondary ruptures—linear zones of dynamic effects of faults with a strike-slip component in the acoustic basement—are mapped in the areas studied in detail. Some of these ruptures displace recent sediments. As a result, allochthonous blocks of Mesozoic or Paleozoic rocks occasionally barren of recent marine sediments arise under transpressional conditions. Other signs of the present-day secondary faulting include shallow-seated injection folds and a peculiar wavy topography of mud in deep areas of the bottom. The relationship of exotic submarine mounds and gas emissions in the eastern Pechora Sea with recent mud volcanoes controlled by the neotectonic activity of the Pai-Khoi-Novaya Zemlya Foldbelt under conditions of lateral compression is substantiated for the first time. A superimposed aggradational height is revealed in the most subsided portion of the Central Trench; the origin of this height is referred to the effect of seismic vibration of the seafloor that brings about partial fluidization of surficial marine mud and its ductile-viscous flow and local accumulation in a particularly favorable area of the bottom. The indications of neotectonic activity may be used as a tool for testing the tectonic concepts that are put forward. |
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