Large submarine slides on the Norwegian continental margin: Sediments, transport and timing
Large submarine slides on the Norwegian continental margin: Sediments, transport and timing
复制标题
挪威大陆边缘的大型海底滑坡：沉积物、运输和时间
DOI：
10.1016/0025-3227(87)90069-7
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发表时间：
1987
期刊：
影响因子：
2.9
通讯作者：
H. Sejrup
中科院分区：
文献类型：
--
作者：
E. Jansen;S. Befring;T. Bugge;T. Eidvin;H. Holtedahl;H. Sejrup
描述了挪威西部外大陆坡Storegga的一个大型海底滑坡区。三个主要的滑动事件已被确认涉及的新生代沉积物的总体积为5580 km 3。第一个幻灯片包括3880 km 3，而第二个和最后一个幻灯片共包括1700 km 3。第二个滑道覆盖了3500米的水深和至少800公里的距离。滑坡沉积物由不同类型的泥石流沉积物和浊积岩组成。在主要滑动事件之后，以浊积岩和海底蠕动沉积物形式出现了较小的块体运动。从粗碎屑流到浊积岩的连续过渡是常见的。第一次滑坡由年轻的未固结沉积物组成，而第二次滑坡在法罗群岛-设得兰群岛陡崖以东更深地切入第四纪、新近纪和古近纪沉积物。第一次滑动发生在30，000 B. P.之前，第二次和最后一次滑动发生在全新世8000 - 5000 B. P.之间。地震可能与天然气水合物分解释放的气体一起被认为是最可能的触发机制。
A large submarine slide area at Storegga on the continental slope off western Norway is described. Three main slide events have been recognized involving a total volume of 5580 km3of Cenozoic sediments. The First Slide comprised 3880 km3, while the Second and Last Slides together comprised 1700 km3. The Second Slide covered 3500 m of water depth and a distance of at least 800 km. The sediments deposited by the slides consist of different types of debris flow deposits and turbidites. Smaller mass movements in the form of turbidites and submarine creep deposits have occurred after the main slide events. A continuous transition from coarse debris flows into turbidites is common. The First Slide comprised young, unconsolidated deposits, while the Second Slide cut deeper into Quaternary, Neogene and Paleogene sediments east of the Faeroe-Shetland Escarpment. The First Slide took place before 30,000 B.P., the Second and Last Slides took place in the Holocene between 8000 and 5000 B.P. Earthquakes possibly together with gas released from decomposition of gas hydrates are considered to be the most likely triggering mechanisms.