| 东海陆架冰后期潮流沙脊地貌与内部结构特征 |
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| 引用本文： | 印萍.东海陆架冰后期潮流沙脊地貌与内部结构特征[J].海洋科学进展,2003,21(2):181-187. |
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| 作者姓名： | 印萍 |
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| 作者单位： | 国家海洋局第一海洋研究所,山东,青岛,266061 |
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| 基金项目： | 国家海洋局青年基金资助项目——晚第四纪东海潮流沙脊发育与海平面升降的响应(2000505)，华东师范大学河口海岸动力沉积和动力地貌综合国家重点实验室开放课题基金项目——晚第四纪东海潮流沙脊发育与海平面升降的响应(200005) |
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| 摘 要： | 东海陆架以宽平的地形、充分的陆源沉积物供应、快速沉降和强动力场为特征，中外陆架发育大规模潮流沙脊地貌。潮流沙脊走向大致为NW—SE向分布，与区域潮流主方向一致或成较小交角。东海陆架冰后期潮流沙脊以不对称横剖面为特征，陡坡倾向SW。沙脊内部发育典型的高角度前积斜层理，倾向与沙脊横剖面陡坡方向一致。这些斜层理可以划分为高达4组不同特征的组合，分别代表潮流沙脊发育的不同阶段，对应于冰后期海平面上升的不同时期。东海陆架潮流沙脊主体形成于冰后期海侵阶段，目前仍然受到陆架潮流场的影响，沙脊顶部为再沉积活动层。
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| 关 键 词： | 东海 陆架 冰后期 潮流沙脊 地貌 海面上升 流场 陡坡 |
| 文章编号： | 1671-6647(2003)02-0181-07 |
| 修稿时间： | 2003年3月22日 |
Geomorphology and Internal Structure of Postglacial Tidal Sand Ridges on the East China Sea Shelf |
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| Yin Ping.Geomorphology and Internal Structure of Postglacial Tidal Sand Ridges on the East China Sea Shelf[J].Advances in Marine Science,2003,21(2):181-187. |
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| Authors: | Yin Ping |
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| Abstract: | The East China Sea(ECS) shelf is characterized by gentle topography, large amount of sediment supply, high settling rate and strong dynamic field, and the tidal sand ridges are well developed and distributed on the ECS shelf. The tidal sand ridges feature a NW-SE strike, which is consistent with the local primary tidal current direction. The cross-section of tidal sand ridges is asymmetric with a steep slope inclining to the SW. The typical high-angle foreset inclined beddings are developed inside the sand ridges, and the trend of inclined beddings is the same as that of the steep slope. These inclined beddings can be divided into 4 bedding assemblages to represent different development stages of tidal sand ridges and to correspond to different postglacial sea-level rise periods. The tidal sand ridges on the ECS shelf were mainly formed during the postglacial transgression period, are still influenced by the tidal current field on the ECS shelf, and the top parts of sand ridges are mobile and redeposited beds. |
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| Keywords: | East China Sea shelf tidal sand ridge sea-level rise postglacial transgression |
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