Transect variations and controlling factors of redox-sensitive trace element compositions of surface sediments in the South China Sea
文献类型：期刊论文
| 作者 | Cheng, Jun; Huang, Yi; Wang, Shuhong; Miao, Li; Yan, Wen |
| 刊名 | CONTINENTAL SHELF RESEARCH
 |
| 出版日期 | 2019 |
| 卷号 | 190页码:103978 |
| 关键词 | Redox-sensitive trace elements Surface sediments Transect variations Controlling factors South China Sea |
| DOI | 10.1016/j.csr.2019.103978 |
| 英文摘要 | Signatures of redox-sensitive trace elements (RSTEs; e.g., V, Cr, U, and Mo) preserved in marine sediments provide unique clues to the nature and changes of ocean oxygenation and redox states. There have, however, been few studies of the RSTE geochemistry of marine sediments in the South China Sea (SCS). Here we present the results of a study of concentrations of major elements Al2O3, TiO2, Fe2O3, CaO, and MnO and trace elements V, Cr, U, Mo, Sr, and Ba in 75 surface sediment samples collected along four longitudinal and latitudinal transects in the SCS with the aim of identifying the transect variations and main controlling factors of RSTE compositions as well as their redox indications. Variations in sediment V, Cr, and U concentrations along each transect are similar to those of Al2O3, TiO2, and Fe2O3 but are the inverse of CaO variations. Variations in Mo concentrations differ from those of V, Cr, U, Al2O3, TiO2, Fe2O3, and CaO, but are similar to those of MnO. V, Cr, and U in sediments are derived mainly from terrigenous materials, with significant proportions stored in detrital particulate matter rather than being deposited as redox-related precipitation under anoxic conditions. Sediment V, Cr, and U concentrations are diluted by biogenic carbonates. There is little detrital Mo. Although most samples are enriched in Mo relative to upper continental crust, the degree of enrichment is lower than that observed under anoxic or euxinic conditions and is due mainly to the adsorption by Mn-oxyhydroxides. The little or none of authigenic RSTE component in the surface sediments indicates the current generally oxic SCS seafloor environment, which is consistent with the higher seafloor dissolved oxygen content in the SCS. The assessment of detrital particulate flux and authigenic component of specific RSTEs is necessary for reliable redox interpretations. |
| 资助机构 | Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41576035]; National Special Project on Basic Research of Science and Technology [2008FY110100]; Science and Technology Basic Resource Investigation Program of China [2017FY201403]; Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDA13010102] ; Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41576035]; National Special Project on Basic Research of Science and Technology [2008FY110100]; Science and Technology Basic Resource Investigation Program of China [2017FY201403]; Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDA13010102] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18251]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Cheng, Jun,Huang, Yi,Wang, Shuhong,et al. Transect variations and controlling factors of redox-sensitive trace element compositions of surface sediments in the South China Sea[J]. CONTINENTAL SHELF RESEARCH,2019,190:103978. |
| APA | Cheng, Jun,Huang, Yi,Wang, Shuhong,Miao, Li,&Yan, Wen.(2019).Transect variations and controlling factors of redox-sensitive trace element compositions of surface sediments in the South China Sea.CONTINENTAL SHELF RESEARCH,190,103978. |
| MLA | Cheng, Jun,et al."Transect variations and controlling factors of redox-sensitive trace element compositions of surface sediments in the South China Sea".CONTINENTAL SHELF RESEARCH 190(2019):103978. |
入库方式： OAI收割
来源：南海海洋研究所
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