| 东山岛以东近岸海域水下沙丘及其环境 |
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| 引用本文： | 杨顺良,骆惠仲,梁红星.东山岛以东近岸海域水下沙丘及其环境[J].台湾海峡,1996(4). |
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| 作者姓名： | 杨顺良 骆惠仲 梁红星 |
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| 作者单位： | 福建海洋研究所!厦门361012 |
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| 摘 要： | 1990～1991年，我所对东山岛海域进行海底地形、底质调查、水文泥沙测验时发现：1）沿东山岛一古雷半岛的NNE、NE向断裂在海域呈现为落差可达20m左右“V”字型深糟；2）在东山岛东部10m等深线以东海域发育众多的水沙丘群，水深15m左右有一地形坡折线，水深20～25m海底为水下一级阶地。据底质粒度、石英电镜扫描、重矿物、地球化学指标等分析表明，水下沙丘群分布区的沉积为准残留沉积，水下一级阶地及水下沙丘为早期滨岸的准残留地貌作，又受到后期现代水动力的改造。
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| 关 键 词： | 水下沙丘 水下阶地 准残留沉积 东山岛 |
Submarine dunes and their sedimentary environment of eastern sea area of Dongshan Island, Fujian |
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| Yang Shunliang, Luo Huizhong and Liang Hongxing.Submarine dunes and their sedimentary environment of eastern sea area of Dongshan Island, Fujian[J].Journal of Oceanography In Taiwan Strait,1996(4). |
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| Authors: | Yang Shunliang Luo Huizhong and Liang Hongxing |
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| Abstract: | Investigation on the submarine relief, bottom sediment and suspended silt were made in the eastern sea area of Dongshan Island in 1990-1991. Following results were obtained:1)The fractures along the NNE and NE directions of the Dongshan lsland and the Gulei Peninsula are shown by V-shape troughs with a depth drop of about 2o m. 2)In the area many submariae dune-groups were developed from lom depth and deeper, the slope break appears in 15 m contour or so. From 20 m to 25 m depth area there is a submarine terrace.Based on the analytical results of grain-size, quartz electron microscope scanning, heavy mineral and sediment chemistry, the sediment of submarine dunes are composed of plimpsest sediments. The submarine dunes and the submarine terrace belong to the plimpsest goemorphology of the earlier coastal zone, which have been reworked by modern hydrodynamics. |
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| Keywords: | Submarine dunes submarine terrace plimpsest sediment Dongshan Island Fujian |
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