Compositions of foraminifera-rich turbidite sediments from the Shenhu area on the northern slope of the South China Sea: Implication for the presence of deep water bottom currents
文献类型：期刊论文
| 作者 | Li, N; Feng, D; Chen, LY; Wang, HB; Chen, DF; liniu@mail.sysu.edu.cn; feng@scsio.ac.cn |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2017 |
| 卷号 | 138页码:148-160 |
| 关键词 | Trace Metals Turbidites Redox Condition South China Sea |
| 英文摘要 | The sediments in gravity core DH-1, collected from Shenhu area on the northern slope of the South China Sea, are composed of two dark grey clay silt layers (A(1) and A(3)) and two foraminifera-rich layers (A(2) and A(4)) (A(1) is the top layer and A(4) is the bottom layer). Major and trace metal contents, along with grain size and mineralogic data suggest that these silt layers represent background hemipelagic sedimentation. Unlike silt layers, the intervening foraminifera-rich layerA(4) exhibits a fining-upward trend, is distal turbidite. Grain size CM diagram and the sharp contacts between the foraminifera-rich layer A(2) and the upper and lower layers suggest layer A(2) is the result of depositional interaction between turbidite and bottom currents. AMS 14C dating of planktonic foraminifera indicate the age of the turbidite in A(2) is between15.3 ka and 22.6 ka. We hypothesize that turbidite formation in this period was related to the increase supply of terrigenous matter since the Last Glacial Maximum. The rapid deposition of each turbidite led to reduced rates of oxygen diffusion into the sediment, allowing anoxic conditions develop in sediments and fostering U enrichment (> 3.1 mu g/g) in foraminifera-rich layer A(4b). In contrast, decrease concentration of U and U/Mo ratios in foraminifera-rich layerA(2), which is possibly due to U remobilization as a consequence of downward penetration of the oxidation front from the oxygen rich bottom currents. These new data suggest that authigenic U was quite sensitive to the inflow of bottom currents, and U/Mo ratios may indicate the depositional environmental change in relation to the bottom current action on the turbidite. (C) 2017 Elsevier Ltd. All rights reserved. |
| 资助项目 | MSG |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/16493]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 通讯作者 | liniu@mail.sysu.edu.cn; feng@scsio.ac.cn |
| 推荐引用方式 GB/T 7714 | Li, N,Feng, D,Chen, LY,et al. Compositions of foraminifera-rich turbidite sediments from the Shenhu area on the northern slope of the South China Sea: Implication for the presence of deep water bottom currents[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,138:148-160. |
| APA | Li, N.,Feng, D.,Chen, LY.,Wang, HB.,Chen, DF.,...&feng@scsio.ac.cn.(2017).Compositions of foraminifera-rich turbidite sediments from the Shenhu area on the northern slope of the South China Sea: Implication for the presence of deep water bottom currents.JOURNAL OF ASIAN EARTH SCIENCES,138,148-160. |
| MLA | Li, N,et al."Compositions of foraminifera-rich turbidite sediments from the Shenhu area on the northern slope of the South China Sea: Implication for the presence of deep water bottom currents".JOURNAL OF ASIAN EARTH SCIENCES 138(2017):148-160. |
入库方式： OAI收割
来源：南海海洋研究所
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