Morphology and pattern of Quaternary sedimentation in the North Sea Basin (52–62°N)
Morphology and pattern of Quaternary sedimentation in the North Sea Basin (52–62°N)
复制标题
北海盆地第四纪沉积形态与模式（52-62°N）
DOI：
10.1016/j.marpetgeo.2018.08.022
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发表时间：
2018
影响因子：
4.2
通讯作者：
H. Løseth
中科院分区：
文献类型：
--
作者：
D. Ottesen;C. Batchelor;J. Dowdeswell;H. Løseth
第四纪北海盆地从欧洲大陆西北部的南纬 11 度（北纬 52 度）一直延伸到北纬 62 度的挪威海，包含厚达 1 公里的 12 沉积层序，记录了过去约 13 世纪周围 13 个陆地区域的沉积物供给性质的变化。 2.6马。我们使用广泛的 2D 和 3D 地震 14 数据库来关联北海主要第四纪地震地层表面和单元 15 ，并重建整个第四纪北海 16 盆地的大尺度填充模式。北海第四纪沉积物总体积（350,000平方公里）约为c。 140,000 17 km 3 ，而第四纪基底表面 500 m 等高线以内的区域体积为 18 109,000 km 3 。第四纪早期 19 年间，北海盆地发育了两个基本独立的沉积中心：南部和中部次盆地被来自东部和东南部的陆架河流三角洲 20 和前三角洲沉积物充填，而北部次流域 21 主要被挪威大陆以 22 为中心的冰块沉积的冰川生成泥石流所填充。等高流是沉积物 23 沉积和改造的重要机制，盆地内的水循环可能沿逆时针方向发生 24 。虽然北海盆地南部的大部分地区在 1.6-25 1.7 Ma 左右被充填，但北海中部的洼地一直持续到 1 Ma 左右。对 26 个地貌的 3D 地震数据分析表明，芬诺斯坎迪亚冰盖 (FIS) 在第 28 第四纪最早期间间歇性地延伸至北海北部的古陆架断裂处，并在挪威 29 海峡开挖之前扩展到北海中部。 30
The Quaternary North Sea Basin, which extends from northwest mainland Europe in the 11 south (52 N) to the Norwegian Sea in the north (62 N), contains a thick (up to 1 km) 12 sedimentary succession that records the changing nature of sediment supply from 13 surrounding land areas during the last c. 2.6 Ma. We use an extensive 2D and 3D seismic 14 database to correlate major Quaternary seismo-stratigraphic surfaces and units across the 15 North Sea and reconstruct the broad-scale infill pattern of the entire Quaternary North Sea 16 Basin. The total volume of Quaternary sediments in the North Sea (350,000 km²) is c. 140,000 17 km 3, while the area inside the 500 m contour of the base-Quaternary surface has a volume of 18 109,000 km 3. Two largely independent depocentres developed in the North Sea Basin during 19 the early Quaternary: the southern and central sub-basin was infilled by shelf fluvio-deltaic 20 and prodeltaic sediments delivered from the east and south-east, whilst the northern sub-basin 21 was infilled mainly by prograding glacigenic debris-flows deposited from an ice mass centred 22 on the Norwegian mainland. Contour currents were an important mechanism of sediment 23 deposition and reworking, with water circulation in the basin probably occurring in an anti-24 clockwise direction. Whilst most of the southern North Sea Basin was infilled by around 1.6-25 1.7 Ma, a depression persisted in the central North Sea until around 1 Ma. The analysis of 26 landforms on 3D seismic data suggests that the Fennoscandian Ice Sheet (FIS) extended 27 intermittently to the palaeo-shelf break in the northern North Sea during the earliest 28 Quaternary and expanded into the central North Sea prior to the excavation of the Norwegian 29 Channel. 30