| 北仑河口柱状沉积物粒度特征 |
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| 引用本文： | 王恒波,许江.北仑河口柱状沉积物粒度特征[J].台湾海峡,2010,29(4):555-565. |
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| 作者姓名： | 王恒波 许江 |
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| 作者单位： | 国家海洋局第三海洋研究所,福建厦门361005 |
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| 基金项目： | 广西908专项资助项目 |
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| 摘 要： | 根据北仑河口3个钻孔柱状沉积物的粒度分析结果,结合14C测年和210Pb测年资料,分析了钻孔沉积物的粒度特征,结果表明：KL1柱样沉积物主要为粉砂质砂、砂质粉砂、中细砂、细中砂,沉积物由下到上由细到粗再变细,经历了2个沉积变化;KL2柱样沉积物单一,为细中砂;KL3柱样沉积物由下到上依次为砾石、砂砾、粗中砂、细中砂、砾砂、粉砂质砂、粘土质粉砂、砂-粉砂-粘土,沉积物粒度由下到上逐步细化,该孔早期离物源较近.3个孔的沉积物分选大多很差,反映当时水动力作用较强或者离物源较近.这些沉积物类型为晚更新世末次冰期以来的沉积,记录了晚更新世以来2个沉积变化.
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| 关 键 词： | 海洋地质学 北仑河口 粒度特征 沉积环境 |
Characteristics of grain size of core sediment in Beilun Estuary |
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| WANG Heng-bo,XU Jiang.Characteristics of grain size of core sediment in Beilun Estuary[J].Journal of Oceanography In Taiwan Strait,2010,29(4):555-565. |
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| Authors: | WANG Heng-bo XU Jiang |
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| Institution: | (Third Institute of Oceanography,SOA,Xiamen 361005,China) |
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| Abstract: | Grain size analysis of three cores of sediment from Beilun Estuary were combined with 14C and 210Pb dating data to evaluate their grain size distribution.The results revealed that the sediment types of core KL1 were silty sand,sandy silt,medium-fine sand and fine-medium sand and the grain size of the sediments from the bottom to the surface followed a fine-coarse-fine sequence.Additionally,the deposition in core KL1 had undergone two changes.The sediment of core KL2 consisted entirely of fine-medium sand.The sediments of core KL3 from the bottom to surface were gravel,sandy gravel,coarse-medium sand,fine-medium sand,gravel sand,silt sand,clayey silt,and sand-silt-clay i.e.in increasingly finer terms,and the core was near to the provenance at the early stage.The sediments of these three cores have bad sorting,reflecting a powerful water dynamic effect or a nearness to the sources at that time.The sediments were deposited from the Late Pleistocene period during the Last Ice Age and showed two sedimentary cycles in this area from the Late Pleistocene. |
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| Keywords: | marine geology Beilun Estuary characteristics of grain size sediment environment |
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