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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Sedimentary processes shaping the eastern slope of the Faeroe-Shetland Channel
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Sedimentary processes shaping the eastern slope of the Faeroe-Shetland Channel

机译：沉积过程塑造了法罗-设得兰群岛海峡的东坡

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摘要

Sidescan sonar images, high-resolution seismic profiles, sediment samples and seabed photographs have been used to characterize the seabed sedimentary environment of the continental slope west the Shetland. The seabed morphology and sedimentary regime in this area result primarily from sediment deposition during the last glacial, modified by erosion and re-distribution of surficial sediments during the Holocene. Examples of glacial age features which have a significant effect on present day seafloor morphology include iceberg ploughmarks, glacigenic debris flows and channels cut into glacigenic sediment sequences. Holocene modification of the late glacial seafloor by bottom currents has given rise to large areas of gravel lag deposits and sand bedforms at scales ranging from tens of centimetres to kilometres. However, evidence for strong currents, directed towards the NE, is largely restricted to the upper slope. Much of the gravel covered seafloor on the lower slope shows little evidence for strong currents, suggesting that low sediment input during the Holocene is the main reason why gravel of glacial age remains at the seabed. A localised contourite sand deposit on the lower slope suggests peak current speeds of a few tens of cms(-1), with derivation of the sand from a relict sandwave field which occurs immediately up current and upslope from the contourite body. (C) 2001 Elsevier Science Ltd. All rights reserved. [References: 43]
机译：Sidescan声纳图像，高分辨率地震剖面，沉积物样本和海床照片已用于表征设得兰群岛以西大陆坡的海床沉积环境。该地区的海床形态和沉积方式主要来自上一次冰川时期的沉积物沉积，并受到全新世时期表层沉积物的侵蚀和重新分布的影响。对当今海底形态有重大影响的冰川时代特征的例子包括冰山犁痕，冰川成碎片流和切成冰川成因沉积物序列的通道。底部洋流对晚冰川期海底进行全新世改造，形成了大面积的砾石滞后沉积物和沙床，规模从几十厘米到千米不等。但是，流向NE的强电流的证据主要限于上坡。下坡的大部分砾石覆盖的海底几乎没有显示出强烈洋流的迹象，这表明全新世期间沉积物输入量低是冰川期砾石保留在海床的主要原因。在较低坡度上的局部砂岩沉积表明，峰值电流速度为几十厘米（-1），砂岩是从残余砂波场衍生而来的，而砂岩场是在刚好从砂岩体向上和向上倾斜时发生的。 （C）2001 Elsevier ScienceLtd。保留所有权利。 [参考：43]

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