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首页> 外文期刊>Marine Geology >Late Weichselian depositional processes, fluxes, and sediment volumes on the margins of the Norwegian Sea (62-75 deg N)
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Late Weichselian depositional processes, fluxes, and sediment volumes on the margins of the Norwegian Sea (62-75 deg N)

机译：挪威海边缘（北纬62-75度）的Weichselian晚期沉积过程，通量和沉积物量

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摘要

Quaternary continental margin sedimentation in the Norwegian-Greenland Sea has been a response to a combination of tectonic, oceanographic, and glacial activity. Using geophysical survey data (6.5 kHz side-scan sonar and 3.5 kHz penetration echo sounding), in association with bathymetric datasets, the magnitude and frequency of the main forms of margin sedimentation into the Lofoten and Norwegian Basins of the Norwegian Sea during the Late Weichselian and Holocene are estimated. By comparing these geophysically determined estimates of sediment fluxes with numerically modelled ice-sheet sediment delivery, the role of ice-sheets in shaping the processes acting on this margin is assessed. Sediment flux at the shelf edge during the Late Quaternary is dominated by ice-sheet delivery of sediments, focused at the mouths of fast-flowing ice streams formed in bathymetric troughs. Interglacials are, by contrast, characterised by comparatively little sediment accumulation. Submarine fans, at the margins of cross-shelf troughs, are major depocentres on this glacier-influenced margin. However, occasional large-scale failures of the continental slope account for approximately 75 percent of the basin sediment accumulation during the past 30000 yr, by eroding substantial quantities of pre-Quaternary deposits. Trough mouth fan and a combination of hemipelagic and glacimarine processes are responsible for the accumulation of the remaining 15 percent and 7 percent of basin sediments, respectively.
机译：挪威-格陵兰海的第四纪大陆边缘沉积是对构造，海洋和冰川活动的综合反应。利用地球物理调查数据（6.5 kHz侧扫声纳和3.5 kHz穿透回波测深），与测深数据集相结合，得出魏氏世代晚期进入挪威罗弗敦海峡和挪威海盆的主要边缘沉积形式的幅度和频率和全新世的估计。通过将这些由地球物理方法确定的泥沙通量估算值与数值模拟的冰盖沉积物输送进行比较，可以评估冰盖在塑造作用于该边界的过程中的作用。在第四纪末期，陆架边缘的泥沙通量主要由沉积物的冰盖输送所致，集中在测深槽中形成的快速流动的冰河口处。相反，间冰期的特征是沉积物相对较少。在跨冰川槽边缘的海底爱好者是受冰川影响的边缘的主要沉积中心。然而，在过去的30000年中，大陆坡偶尔发生大规模破坏，约占盆地沉积物堆积的75％，这是由于侵蚀了大量的第四纪前沉积物。槽扇和半海和冰川湖相结合的过程分别负责剩余15％和7％的盆地沉积物的积累。

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