The effects of diagenetic processes and fluid migration on rare earth element and organic matter distribution in seep-related sediments: A case study from the South China Sea
文献类型：期刊论文
| 作者 | Chen, Linying; Jin, Meng3,5; Wang, Xudong3,5; Wang, Hongbin4; Li, Niu1,3,6 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2020 |
| 卷号 | 191页码:104233 |
| 关键词 | Cold seep Anaerobic oxidation of methane Rare-earth elements South China Sea |
| ISSN号 | 1878-5786 |
| DOI | 10.1016/j.jseaes.2020.104233 |
| 英文摘要 | Methane seepage is an important factor governing microbial activity in marine sediments, although its impact on the distribution of rare-earth elements (REEs) and organic matter in sediments is unclear. Here, we report isotope signatures of organic (delta C-13(TOC)) and inorganic (delta C-13(TIC)) carbon as well as total REEs contents of core sediments collected from a well-characterized seep area on the northern South China Sea. Previous studies have identified sediments corresponding to three methane-release events (MREs) in the studied core: MRE I at 4.0-5.5 m, MRE II at 7.4-8.2 m, and MRE III at 10.0-11.5 m depth intervals. Increased methane flux and reducing bottom waters during MRE I resulted in a higher accumulation of marine-sourced organic matter, as indicated by lower C/N ratios and higher delta C-13(TOC) values compared with those of MREs II and III. Sediments deposited during MRE I have relatively low total REE contents, which may be related to reduced REE adsorption on Mn oxyhydroxides. However, the absence of Ce anomaly at MRE I is more likely due to the detrital input that obscures the original Ce anomaly. In the MRE III sediments, a weak negative Eu anomaly relative to that in the MRE I and II may be attributed to the reduction of Eu3+ to Eu2+ under strongly reducing conditions that caused by intense methane seepage. These observations demonstrate that fluid flow may have an important effect on the distribution of both organic matter and REEs in methane-rich marine sediments. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18554]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 510301, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511458, Peoples R China 3.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China 4.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 5.Guangzhou Marine Geol Survey, Guangzhou 510740, Peoples R China 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Linying,Jin, Meng,Wang, Xudong,et al. The effects of diagenetic processes and fluid migration on rare earth element and organic matter distribution in seep-related sediments: A case study from the South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,191:104233. |
| APA | Chen, Linying,Jin, Meng,Wang, Xudong,Wang, Hongbin,&Li, Niu.(2020).The effects of diagenetic processes and fluid migration on rare earth element and organic matter distribution in seep-related sediments: A case study from the South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,191,104233. |
| MLA | Chen, Linying,et al."The effects of diagenetic processes and fluid migration on rare earth element and organic matter distribution in seep-related sediments: A case study from the South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 191(2020):104233. |
入库方式： OAI收割
来源：南海海洋研究所
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