Enhanced preservation of dark organic carbon by reactive iron in cold-seep sediments
文献类型：期刊论文
| 作者 | Zhao, Bin7,8; Fu, Lulu4; Yao, Peng3,7; Bianchi, Thomas S.1,2; Assavapanuvat, Prakhin1,10; Niu, Mingyang9; Yi, Menglin7; Shi, Yanhong7; Wang, Nan5; Zhu, Junjiang5 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2025-11-05 |
| 卷号 | 695页码:13 |
| 关键词 | Dark organic carbon Cold seep Reactive iron Organic carbon preservation Anaerobic oxidation of methane |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2025.123078 |
| 通讯作者 | Yao, Peng(yaopeng@ouc.edu.cn) ; Li, Chaolun(lcl@qdio.ac.cn) |
| 英文摘要 | Reactive iron (FeR) significantly influences sedimentary organic carbon (OC) preservation in marine systems, yet its role in cold seeps remains unclear. This study examines OC-FeR associations and microbial communities at the Formosa Ridge cold seep (South China Sea). Cold-seep sediments exhibit higher OC content and lower delta 13C values than non-seep sediments, suggesting dark OC formation, which is primarily derived from methane and consists of microbial biomass and its byproducts. The dark OC is formed through the assimilation of methanederived carbon by sulfur-oxidizing bacteria (SOB), sulfate-reducing bacteria (SRB), and anaerobic methanotrophic archaea (ANME). Above the sulfate-methane transition zone (SMTZ), the fraction of OC-FeR in bulk OC (fOC-FeR) remains comparable to non-seep sediments, despite a decrease in the availability of FeR due to iron sulfides formation. Within the SMTZ, Fe reduction driven by anaerobic oxidation of methane leads to OC-FeR loss. Below the SMTZ, high fOC-FeR and unchanged FeR demonstrate the role of FeR in long-term OC sequestration. A mixing model indicates significantly higher proportion of dark OC associated with FeR relative to bulk OC, especially exceeding 70 % within the SMTZ, suggesting either preferential association of dark OC with FeR or insitu OC-FeR formation. This indicates that FeR effectively preserves dark OC even under strongly reducing conditions. Compared to other marine environments, cold seeps show higher OC loadings but lower fOC-FeR due to anaerobic microbial activity. We demonstrate that FeR plays a critical role in preserving dark OC across redox gradients, supporting long-term OC burial in reducing environments. |
| WOS关键词 | DEEP-SEA SEDIMENTS ; ANAEROBIC OXIDATION ; CHANGJIANG ESTUARY ; METHANE ; SULFATE ; MATTER ; GULF ; FE ; ASSOCIATIONS ; DIVERSITY |
| 资助项目 | Fundamental Research Funds for the Central Universities[202172002] ; National Natural Science Foundation of China[42476044] ; National Natural Science Foundation of China[42376046] ; National Natural Science Foundation of China[42030407] ; National Natural Science Foundation of China[41906124] ; Basic Scientific Fund for National Public Research Institutes of China[2024Q05] ; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)[SML2023SP220] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001592232100002 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/203587]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Yao, Peng; Li, Chaolun |
| 作者单位 | 1.Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA 2.Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA 3.Qingdao Marine Sci & Technol Ctr, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China 4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 5.Ocean Univ China, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Coll Marine Geosci, Qingdao 266100, Peoples R China 6.Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China 7.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao, Peoples R China 8.Minist Nat Resources, Inst Oceanog 1, Qingdao 266061, Peoples R China 9.Sun Yat Sen Univ, Sch Environm Sci & Engn, Southern Marine Sci & Engn Guangdong Lab Zhuhai, State Key Lab Biocontrol,Environm Microbi Res Ctr,, Guangzhou 510006, Peoples R China 10.Chulalongkorn Univ, Fac Sci, Dept Geol, Bangkok 10330, Thailand |
| 推荐引用方式 GB/T 7714 | Zhao, Bin,Fu, Lulu,Yao, Peng,et al. Enhanced preservation of dark organic carbon by reactive iron in cold-seep sediments[J]. CHEMICAL GEOLOGY,2025,695:13. |
| APA | Zhao, Bin.,Fu, Lulu.,Yao, Peng.,Bianchi, Thomas S..,Assavapanuvat, Prakhin.,...&Yu, Zhigang.(2025).Enhanced preservation of dark organic carbon by reactive iron in cold-seep sediments.CHEMICAL GEOLOGY,695,13. |
| MLA | Zhao, Bin,et al."Enhanced preservation of dark organic carbon by reactive iron in cold-seep sediments".CHEMICAL GEOLOGY 695(2025):13. |
入库方式： OAI收割
来源：海洋研究所
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