TY - JOUR

T1 - НОВЫЕ ДАННЫЕ О СТРОЕНИИ ЧЕТВЕРТИЧНОГО ПОКРОВА КАНДАЛАКШСКОГО ЗАЛИВА БЕЛОГО МОРЯ ПО МАТЕРИАЛАМ ВЫСОКОРАЗРЕШАЮЩЕГО СЕЙСМИЧЕСКОГО ПРОФИЛИРОВАНИЯ

AU - Рыбалко, Александр Евменьевич

AU - Токарев, Михаил Юрьевич

AU - Рябчук, Дарья Владимировна

AU - Кудинов, Артем Анатольевич

AU - Терёхина, Яна Евгеньевна

AU - Алешин, Михаил Игоревич

AU - Беляев, Павел Юрьевич

AU - Хлебникова, Оксана Александровна

AU - Бабушкина, Ксения Владимировна

AU - Аксенов, Алексей Олегович

PY - 2025

Y1 - 2025

N2 - The article examines the features of the transition zone from the deep-water to the shallow-water part of the Kandalaksha Bay of the White Sea, which is represented by a ridge of heterogeneous (structural, glacial, and water-glacial) origin. The materials are based on new data obtained through continuous seismic-acoustic profiling (CSP). Multi-channel high-frequency modifications of seismic equipment were used. This allowed to execute a more detailed seismic-stratigraphic division of the thicknesses of subglacial (glacio-lacustrine and glacio-marine) and marine nepheloid deposits. In particular, three horizons were distinguished in the thickness of layered supraglacial sediments by textural features. They reflect the evolution of primary glacial-lake basin into glacial-marine. Large ice-proximal fans with high sediment thickness are distinguished in the upper part of the ridge. These fans mainly formed the relief of the studied ridge. These and other obtained data allow us to raise the question of the transformation of the continental glacier into a shelf glacier in a certain period of time within the process of degradation of the Scandinavian glacier. The wide development of modern geodynamic movements, significantly affecting the nature of the bottom relief and the accompanying gravitational processes, is shown. Stepped relief, alternation of local basins of Holocene nepheloid accumulation, separated by relatively steep slopes lacking sedimentary cover, are associated with these movements. Seismotectonic phenomena were a trigger for gravitational processes, which are also clearly visible on seismograms. The obtained materials allow for a substantial detalization of the paleogeographic conditions in the Late Pleistocene-Holocene, in particular, to more fully characterize the stage of environmental evolution from the glacial conditions to the glacial-marine and marine.

AB - The article examines the features of the transition zone from the deep-water to the shallow-water part of the Kandalaksha Bay of the White Sea, which is represented by a ridge of heterogeneous (structural, glacial, and water-glacial) origin. The materials are based on new data obtained through continuous seismic-acoustic profiling (CSP). Multi-channel high-frequency modifications of seismic equipment were used. This allowed to execute a more detailed seismic-stratigraphic division of the thicknesses of subglacial (glacio-lacustrine and glacio-marine) and marine nepheloid deposits. In particular, three horizons were distinguished in the thickness of layered supraglacial sediments by textural features. They reflect the evolution of primary glacial-lake basin into glacial-marine. Large ice-proximal fans with high sediment thickness are distinguished in the upper part of the ridge. These fans mainly formed the relief of the studied ridge. These and other obtained data allow us to raise the question of the transformation of the continental glacier into a shelf glacier in a certain period of time within the process of degradation of the Scandinavian glacier. The wide development of modern geodynamic movements, significantly affecting the nature of the bottom relief and the accompanying gravitational processes, is shown. Stepped relief, alternation of local basins of Holocene nepheloid accumulation, separated by relatively steep slopes lacking sedimentary cover, are associated with these movements. Seismotectonic phenomena were a trigger for gravitational processes, which are also clearly visible on seismograms. The obtained materials allow for a substantial detalization of the paleogeographic conditions in the Late Pleistocene-Holocene, in particular, to more fully characterize the stage of environmental evolution from the glacial conditions to the glacial-marine and marine.

KW - Kandalaksha Bay

KW - White Sea

KW - glacial deposits

KW - glacio-lacustrine and glacio-marine sediments

KW - gravitational processes

KW - modern geodynamic movements

KW - seismoacoustic profiling

UR - https://www.mendeley.com/catalogue/befc7937-93b5-315c-b328-2bb3d6221d63/

U2 - 10.21638/spbu07.2025.108

DO - 10.21638/spbu07.2025.108

M3 - статья

VL - 70

SP - 143

EP - 165

JO - Вестник Санкт-Петербургского университета. Науки о Земле

JF - Вестник Санкт-Петербургского университета. Науки о Земле

SN - 2541-9668

IS - 1

ER -