Sedimentation rates and provenance analysis in the Southwestern Okinawa Trough since the mid-Holocene
文献类型：期刊论文
| 作者 | Li ChuanShun1,2; Jiang Bo1,2,3; Li AnChun1; Li TieGang1 ; Jiang FuQing1
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| 刊名 | CHINESE SCIENCE BULLETIN
 |
| 出版日期 | 2009-04-01 |
| 卷号 | 54期号:7页码:1234-1242 |
| 关键词 | Southwesternmost Okinawa Trough Mid-holocene Sedimentation Rates Sediment Source |
| ISSN号 | 1001-6538 |
| DOI | 10.1007/s11434-009-0010-0 |
| 文献子类 | Article |
| 英文摘要 | As a high-sedimentation rate depocenter along the path of the Kuroshio Current, the southwesternmost part of the Okinawa Trough is a key area to understand the Kuroshio history and sediments transportation. A 34.17-m-long sediment core was obtained by the advanced piston corer of Marco Polo/IMAGES XII MARION DUFRESNE during the May 2005 from the Southern Okinawa Trough at site MD05-2908. The recovered sediments were analyzed by AMS (14)C dating, coarse size fraction (> 63 mu m) extraction and moisture content determination in order to study its sedimentation flux and provenance. The depth-age relationship of core MD05-2908 was well constrained by 17 (14)C dating points. The sediments span across the mid-Holocene (6.8 ka B.P.) and have remarkablely high sedimentation rates between 1.8 and 21-2 m/ka, which is well consistent with the modern observations from sediment traps. We identified five 70-200 a periods of abnormally rapid sedimentation events at 6790-6600 a B.P., 5690-5600 a B.P., 4820-4720 a B.P., 1090-880 a B.P., and 260-190 a B.P., during which the highest sedimentation rate is up to 21-2 m/ka. In general, the lithology of the sediments were dominated by silt and clay, associated with less than 5% coarse size fraction (a parts per thousand << 63 mu m). As the most significant sediment source, the Lanyang River in northeastern Taiwan annually deliver about 10Mt materials to the coastal and offshore region of northeast Taiwan, a portion of which could be carried northward by currents toward the study area. Therefore, we concluded that the 5 abnormally rapid sedimentation events may be related to intensified rainfall in Taiwan and thus increased materials to our study area at that time. However, a few extreme-rapid sedimentation events cannot be explained by normal river runoff alone. The large earthquakes or typhoons induced hyperpycnal discharge of fluvial sediment to the ocean may also act as a potential source supply to the Okinawa Trough.; As a high-sedimentation rate depocenter along the path of the Kuroshio Current, the southwesternmost part of the Okinawa Trough is a key area to understand the Kuroshio history and sediments transportation. A 34.17-m-long sediment core was obtained by the advanced piston corer of Marco Polo/IMAGES XII MARION DUFRESNE during the May 2005 from the Southern Okinawa Trough at site MD05-2908. The recovered sediments were analyzed by AMS C-14 dating, coarse size fraction (> 63 mu m) extraction and moisture content determination in order to study its sedimentation flux and provenance. The depth-age relationship of core MD05-2908 was well constrained by 17 C-14 dating points. The sediments span across the mid-Holocene (6.8 ka B.P.) and have remarkablely high sedimentation rates between 1.8 and 21-2 m/ka, which is well consistent with the modern observations from sediment traps. We identified five 70-200 a periods of abnormally rapid sedimentation events at 6790-6600 a B.P., 5690-5600 a B.P., 4820-4720 a B.P., 1090-880 a B.P., and 260-190 a B.P., during which the highest sedimentation rate is up to 21-2 m/ka. In general, the lithology of the sediments were dominated by silt and clay, associated with less than 5% coarse size fraction (a parts per thousand << 63 mu m). As the most significant sediment source, the Lanyang River in northeastern Taiwan annually deliver about 10Mt materials to the coastal and offshore region of northeast Taiwan, a portion of which could be carried northward by currents toward the study area. Therefore, we concluded that the 5 abnormally rapid sedimentation events may be related to intensified rainfall in Taiwan and thus increased materials to our study area at that time. However, a few extreme-rapid sedimentation events cannot be explained by normal river runoff alone. The large earthquakes or typhoons induced hyperpycnal discharge of fluvial sediment to the ocean may also act as a potential source supply to the Okinawa Trough. |
| 学科主题 | Multidisciplinary Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000264842600017 |
| 公开日期 | 2010-12-22 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/3683]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.China Ocean Press, Beijing 100081, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li ChuanShun,Jiang Bo,Li AnChun,et al. Sedimentation rates and provenance analysis in the Southwestern Okinawa Trough since the mid-Holocene[J]. CHINESE SCIENCE BULLETIN,2009,54(7):1234-1242. |
| APA | Li ChuanShun,Jiang Bo,Li AnChun,Li TieGang,&Jiang FuQing.(2009).Sedimentation rates and provenance analysis in the Southwestern Okinawa Trough since the mid-Holocene.CHINESE SCIENCE BULLETIN,54(7),1234-1242. |
| MLA | Li ChuanShun,et al."Sedimentation rates and provenance analysis in the Southwestern Okinawa Trough since the mid-Holocene".CHINESE SCIENCE BULLETIN 54.7(2009):1234-1242. |
入库方式： OAI收割
来源：海洋研究所
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