Influence of Modern Geodynamic Processes on the Formation of the Coastal Relief and Seabed of the White Sea

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-06-19 DOI:10.1134/s0016852124700031
A. E. Rybalko, V. A. Shcherbakov, M. Yu. Tokarev, A. A. Kudinov, P. Yu. Belyaev, T. Yu. Repkina, N. E. Zaretskaya, Ya. E. Terekhina, V. V. Ivanova, V. I. Slichenkov
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Abstract

The article presents the results of a study of modern geodynamic movements in bottom structures of the White Sea (Baltic Shield). Based on expeditionary work in the White Sea, data were obtained on the formation of the seabed relief and thickness of unconsolidated sediments under the influence of modern seismotectonic events and geodynamic movements, as well as long-term neotectonic processes. It is shown that the Kandalaksha Bay depression is a modern graben developing along faults activated in the Quaternary. Graben development continues to the northwest, where a new Quaternary structure is being formed. Signs of modern geodynamic movements have been identified. The authors demonstrate the role of disjunctive tectonics in the formation of slopes and tectonic structures transverse to the strike of the bay, morphologically represented by relief ridges cutting the Sredny Ludy rise in Kandalaksha Bay. The influence of modern geodynamic processes on the distribution of thicknesses of Quaternary sediments of various genesis and the mosaic distribution of modern bottom sediments has been established. The influence of gravitational processes involved in the formation of underwater landslides, leading to the appearance of abnormally thick layers of the unconsolidated sedimentary cover, has been studied.

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现代地球动力过程对白海沿岸地形和海底形成的影响
摘要 本文介绍了对白海(波罗的海地盾)海底结构中现代地球动力运动的研究结果。根据在白海的考察工作,获得了关于在现代地震构造事件和地球动力运动以及长期新构造过程影响下海底地貌形成和未固结沉积厚度的数据。研究表明,坎达拉克沙湾洼地是沿第四纪活化断层发育的现代地堑。地堑继续向西北方向发展,那里正在形成新的第四纪结构。已发现现代地球动力运动的迹象。作者证明了不连续构造在形成横向于海湾走向的斜坡和构造结构中的作用,在形态上表现为切割坎达拉克沙湾 Sredny Ludy 隆起的地脊。现代地球动力过程对不同成因的第四纪沉积物厚度分布和现代海底沉积物镶嵌分布的影响已经确定。还研究了水下滑坡形成过程中重力作用的影响,这导致了异常厚的未固结沉积覆盖层的出现。
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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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