| 深圳西冲湾的海蚀地貌与海滩沉积研究 |
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| 引用本文： | 滕建彬,沈建伟,Kevin Pedoja. 深圳西冲湾的海蚀地貌与海滩沉积研究[J]. 现代地质, 2007, 21(3): 511-517 |
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| 作者姓名： | 滕建彬 沈建伟 Kevin Pedoja |
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| 作者单位： | 1中国科学院 边缘海地质重点实验室南海海洋研究所，广东 广州510301; 2中国科学院 研究生院, 北京100039 |
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| 基金项目： | 中国科学院"百人计划";国家自然科学基金;中国科学院南海海洋研究所资助项目;广州地球化学研究所边缘海地质重点实验室基金 |
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| 摘 要： | 利用对深圳西冲湾两个岬角之间的海蚀地貌及其海滩沉积物的野外调查资料，鉴定出三级海蚀平台，对其分别进行了高程换算，并借助于海蚀拱门和海蚀刻槽的测定，以及对典型沙层沉积剖面序列的分析和14C测年，认为：虽然西冲湾海蚀平台的岩石类型是不易被侵蚀的花岗岩，但是此处的海蚀地貌（主要是海蚀平台）以及海滩沉积物（主要是海滩岩）可以作为全新世存在高海平面的证据。此外，针对我国海岸带人口密度大，人类活动对海岸影响程度大的现况，提出了未来研究南海北部海岸新构造运动存在的问题以及其解决方案。研究成果对于认识南海北部海岸全新世的构造运动、海平面变化以及与其他地区新构造运动的对比研究都具有重要的意义。
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| 关 键 词： | 海蚀平台 海蚀阶地 海蚀拱门 海滩岩 西冲湾 |
| 文章编号： | 1000-8527（2007）03-0511-07 |
| 收稿时间： | 2006-11-20 |
| 修稿时间： | 2007-01-15 |
Study on Marine-erosion Topography and Deposits in Xichong Bay, Shenzhen |
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| TENG Jian-bin,SHEN Jian-wei,Kevin Pedoja. Study on Marine-erosion Topography and Deposits in Xichong Bay, Shenzhen[J]. Geoscience of Geosciences, 2007, 21(3): 511-517 |
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| Authors: | TENG Jian-bin SHEN Jian-wei Kevin Pedoja |
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| Affiliation: | 1CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, ;Guangzhou, Guangdong510301,China;2Graduate School of the Chinese Academy of Sciences, Beijing100039,China |
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| Abstract: | By field techniques of topographic surveys of Holocene beach and platform profiles in Xichong Bay,3 abrasion platforms including the presently eroding one are detected.According to the altimeter and tide tables,all altitudes are given in meters above mean sea level.The sand profile were divided into 6 layers and samples of seashells collected from the sand profile were performed 14C dating.Specimens of beachrock were examined using microscopy on thin sections.We conclude that although the rock of the platforms is granite which is hardly carved,the abrasion features,especially the platform,can be interpreted as an evidence of Holocene sea level.The altitudes of the beachrock and the platform represent that the mean sea level around 2,000 yr is at least 2.0 m higher than present mean sea level.We also point out a proposal on how to assess the eustatic sea-level movement and tectonic vertical motion of northern coast of South China Sea. |
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| Keywords: | abrasion platform marine terrace marine bridge beachrock Xichong Bay |
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