| Sedimentary processes in Zenisu deep-sea channel revealed by side-scan imagery |
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| 作者姓名： | 吴时国 郭军华 TOKUYAMA Hidekazu |
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| 作者单位： | [1]Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049, China [3]Ocean Research Institute, University, of Tokyo, Tokyo 2370061, Japan |
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| 基金项目： | Financially supported by the NSFC （Grant No.40276022）, Knowledge Innovation Program of Chinese Academy of Sciences （KZCX3-SW-219） and JSPS international cooperation program, and the Ministry of Science and Technology Project （G200046704）.ACKN0LEDGEMENT We thank Dr. Kodera for the side-scan sonar data processing. |
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| 摘 要： | 1 INTRODUCTIONThe eastern Nankai Trough is a submarinetrench reflecting subduction zone where the earth'soceanic crust plunges beneath Japan Islands andcharacterized by extreme topographic relief (Fig.1).The convergent margin off Japan is characterizedmorphologically by numerous deep sea channels(such as the Nankai channel and Zenisu channel),which are closely related to the subduction proc-esses. Channel systems are considered to represent adistinct deep water sedimentation environmen…
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| 关 键 词： | 声纳 声波定位仪 沉积物 深海海峡 |
| 收稿时间： | 2004-06-02 |
| 修稿时间： | 2005-04-15 |
Sedimentary processes in Zenisu deep-sea channel revealed by side-scan imagery |
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| Wu Shiguo,Guo Junhua,Tokuyama Hidekazu.Sedimentary processes in Zenisu deep-sea channel revealed by side-scan imagery[J].Chinese Journal of Oceanology and Limnology,2005,23(4):368-375. |
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| Authors: | Wu Shiguo Guo Junhua Tokuyama Hidekazu |
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| Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;(2) Graduate School of the Chinese Academy of Sciences, 100049 Beijing, China;(3) Ocean Research Institute, University of Tokyo, 2370061 Tokyo, Japan |
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| Abstract: | Side-scan sonar data collected by Cruises 99-09 Leg 2 and 00-06 Leg l of R/V Yokosuka were used to reveal the sedimentary processes in Zenisu deep-sea channel. The middle and lower segments of the channel are rich in turbidite and other debrite deposits. By high-resolution imaging, three sedimentary processes were distinguished with distinct acoustic features. 1. Slumps and slides occur with contrasting backscatter, rough surface textures, blockings, and acoustic shadows at headwalls. They are very extensive and often in lobate form downslope. 2. Debris flow has uniform, general medium backscatter, sometimes showing marbling/lineation in lobate form. 3. Turbidity current is characterized by low backscatter confined to the channel as acoustic signal is attenuated. Regional tectonics must be the dominating factor that controls deposition pattern in this area. |
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| Keywords: | side-scan sonar image sedimentary processes deep-sea channel Nankai Trough |
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