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Organic matter diagenesis in hadal setting: Insights from the pore-water geochemistry of the Mariana Trench sediments
Liu, Shuangquan1,2; Peng, Xiaotong1
2019-05-01
Source PublicationDEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
ISSN0967-0637
Volume147Issue:1Pages:22-31
Abstract

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.

KeywordHadal Sediments Organic Matter Diagenesis Aerobic Respiration Denitrification
DOI10.1016/j.dsr.2019.03.011
Indexed BySCI
Language英语
Funding ProjectNational 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 KeywordBenthic Carbon Mineralization ; Sulfate Reduction ; Marine-sediments ; Sea-floor ; Oxygen ; Deep ; Nitrate ; Rates ; Denitrification ; Nitrification
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000470043200003
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/6775
Collection深海科学研究部_深海地质与地球化学研究室
所领导
Corresponding AuthorPeng, Xiaotong
Affiliation1.Chinese Acad Sci, Lab Deep Sea Geol & Geochem, Inst Deep Sea Sci & Engn, Sanyo 572000, Peoples R China
2.Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
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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