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doi: 10.24412/2687-1092-2022-9-78-86 1 Geological Institute RAS, Moscow, Russia 2 Lomonosov Moscow State University, Moscow, Russia 3 N.N. Zubov State Oceanographic Institute, Moscow, Russia
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Abstract. Based on the results of multibeam survey and high-frequency seismic profiling performed in 2021 during the 51st cruise of the R/V " Akademik Boris Petrov", a widespread of glacial and glacialfluvial landforms was revealed in the northeastern part of the Barents Sea shelf. Glacial relief is represented by moraine ridges and megascale glacial linearity. Among the forms of Glacialfluvial relief is represented by eskers, hollows of runoff of thawed glacial waters and zander plains. Forms of ice exaration (modern and relict), were also identified at the study region. Relict iceberg ploughmarks were recorded at depths of 340 m. Signs of degassing in the relief are expressed in the form of orbed pockmarks with a diameter of 70-80 m and a depth of 4-5 m. Some pockmarks are collected in chains of 4-5 pieces. Acoustic anomalies were detected on seismic profiles, which indicate the rise of fluids. In the upper part of the sedimentary cover, they are represented by bright spots and acoustic blanking, in the water column – by gas flares and areal areas of increased acoustic turbidity. Acoustic anomalies and pockmarks are confined to the areas of range of the glacialfluvial landforms, which is associated with sufficient permeability of fluvioglacial deposits having aleurite and pelitic-aleurite composition. Keywords: Litke Plateau, multibeam bathymetric survey, high-frequency seismic profiling, degassing, acoustic anomalies, pockmarks
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Cite this article:
Denisova A.P., Moroz Е.А., Eremenko Е.А., Sukhikh E.A., Arkhipov V.V. 2022. Signs of degassing within the glacial shelf in the north-eastern part of the Barents sea // Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. Issue 9. P. 78-86. doi: 10.24412/2687-1092-2022-9-78-86
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