Organic matter diagenesis in hadal setting: Insights from the pore-water geochemistry of the Mariana Trench sediments | |
Liu, Shuangquan1,2; Peng, Xiaotong2 | |
刊名 | DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS |
2019-05-01 | |
卷号 | 147期号:1页码:22-31 |
关键词 | Hadal Sediments Organic Matter Diagenesis Aerobic Respiration Denitrification |
ISSN号 | 0967-0637 |
DOI | 10.1016/j.dsr.2019.03.011 |
英文摘要 | The diagenetic processes of organic matter (OM) in hadal sedimentary environments (> 6000 m water depth) are much less studied than those in other accessible environments. In this study, we quantify OM oxidation processes using pore-water geochemical measurements, fluxes, and diagenetic rate calculations in sediments along a depth transect from abyssal to hadal sites (5500-10257 m) in the Mariana Trench. The total benthic O-2 consumption, and depth-integrated rates of nitrification and denitrification are positively correlated with water depth, indicating that OM diagenesis is enhanced in the deep sites of the hadal zone. The negative linear correlation between water depth and oxygen/nitrate penetration depths further supports this conclusion. In the abyssal sites, aerobic respiration dominates OM degradation, and anaerobic processes are negligible. In contrast, denitrification plays an important role in anaerobic OM degradation, and accounts for approximately 5% of the depth-integrated total OM mineralization at the deepest hadal site. Moreover, our results suggest that direct coupling between nitrification and denitrification is significant, and may define the turnover of N in hadal sediments. Although they are not without uncertainties, our results shed new light on the importance of denitrification in sedimentary diagenesis in the deepest part of the Earth's ocean, and could have important implications for understanding the current state of biogeochemical cycles in the hadal zone. |
资助项目 | National Key Research and Development Plan of China[2016YFC0304900] ; Strategic Priority Research Program of the Chinese Academy of Science[XDB06020000] ; National Natural Science Foundation of China[41576038] |
WOS关键词 | Benthic Carbon Mineralization ; Sulfate Reduction ; Marine-sediments ; Sea-floor ; Oxygen ; Deep ; Nitrate ; Rates ; Denitrification ; Nitrification |
WOS研究方向 | Oceanography |
语种 | 英语 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
WOS记录号 | WOS:000470043200003 |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.idsse.ac.cn/handle/183446/6775] |
专题 | 研究生部 深海科学研究部_深海地质与地球化学研究室 专家咨询委员会 |
通讯作者 | Peng, Xiaotong |
作者单位 | 1.Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Lab Deep Sea Geol & Geochem, Inst Deep Sea Sci & Engn, Sanyo 572000, Peoples R China |
推荐引用方式 GB/T 7714 | Liu, Shuangquan,Peng, Xiaotong. Organic matter diagenesis in hadal setting: Insights from the pore-water geochemistry of the Mariana Trench sediments[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2019,147(1):22-31. |
APA | Liu, Shuangquan,&Peng, Xiaotong.(2019).Organic matter diagenesis in hadal setting: Insights from the pore-water geochemistry of the Mariana Trench sediments.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,147(1),22-31. |
MLA | Liu, Shuangquan,et al."Organic matter diagenesis in hadal setting: Insights from the pore-water geochemistry of the Mariana Trench sediments".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 147.1(2019):22-31. |
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