Depositional control on carbon and sulfur preservation onshore and offshore the Oujiang Estuary: Implications for the C/S ratio as a salinity indicator

doi:10.1016/j.csr.2021.104510

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Depositional control on carbon and sulfur preservation onshore and offshore the Oujiang Estuary: Implications for the C/S ratio as a salinity indicator
	Liu, Xiting 2,5; Zhang, Mingyu 2; Li, Anchun 1,5; Fan, Daidu 3; Dong, Jiang 4,5; Jiao, Chaoqun 2; Chang, Xin 2; Gu, Yu 2; Zhang, Kaidi 1; Wang, Houjie 2,5
刊名	CONTINENTAL SHELF RESEARCH
	2021-09-15
卷号	227 页码:11
关键词	Pyrite Organic carbon Sulfur biogeochemistry Mud sediments East China Sea
ISSN号	0278-4343
DOI	10.1016/j.csr.2021.104510
通讯作者	Liu, Xiting(liuxiting@ouc.edu.cn)
英文摘要	Carbon and sulfur preserved in estuary and shelf sediments play a critical role in controlling sediment diagenesis related to the global biogeochemical cycle. Their ratio (C/S = 2.8) in mud sediments has been widely used to distinguish freshwater from marine environments; however, this ratio can be influenced by depositional evolution, physical reworking, and other sedimentological parameters. We present a new C/S ratio data set from surface sediments of five rivers (Aojiang, Feiyunjiang, Jiaojiang, Oujiang, and Qiantangjiang Rivers), as well as core sediments offshore of the Oujiang Estuary (core EC2005, 60 m), to discuss how the evolution of the depositional environment influenced carbon and sulfur preservation since the last deglaciation. To this aim, we measured the contents of total organic carbon (TOC), total sulfur (TS), and carbonate in the collected samples. Our results demonstrate that a C/S ratio of 2.8 can effectively separate freshwater environments (river sediments and core sediments deposited before 13.1 ka), suggesting the initial impact of sulfate-enriched seawater on carbon and sulfur perseveration at similar to 13.1 ka. However, the TS content is independent of the TOC content after 13.1 ka, implying that pyrite sulfur is derived not only from organoclastic sulfate reduction (OSR) but also from sulfate-driven anaerobic oxidation of methane (AOM) under anoxic diagenetic conditions. In the shallowest core section (shallower than 5 m; < 1.5 ka), the C/S ratios gradually increase from 1 to 2.8, which corresponds to an interval with sulfide reoxidation under suboxic conditions caused by strong physical reworking. When the sediment is buried to a certain depth (deeper than 5 m; > 1.5 ka), a high sedimentation rate is conducive to an AOM reaction, resulting in the generation of a large amount of pyrite and finally causing the minimum value of the C/S ratio to be approximately 1. However, during the transitional period of 13.1-11.0 ka, sediments deposited in the tidal environment show overlap with those deposited in the marine shelf environment, and C/S ratios decrease from >10 to similar to 1. In addition, we propose that C/S and C/N ratios could be combined to reveal the depositional evolution from terrestrial to marine environments, which is sensitive to sea level and climatic changes. Therefore, our new findings suggest that the sedimentation process can modulate the diagenetic path of mud sediments (e.g., OSR versus AOM), and geochemical indicators of environmental evolution should be carefully used in combination with sedimentological parameters in shallow depositional environments.
资助项目	National Natural Science Foundation of China[41976053] ; Laboratory for Marine Geology, Qingdao Pilot National Laboratory for Marine Science and Technology[MGQNLM-TD201901] ; State Key Laboratory of Marine Geology, Tongji University[MGK1824]
WOS研究方向	Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000689549600005
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/176299]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Liu, Xiting
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Ocean Univ China, Coll Marine Geosci, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China 3.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 4.Minist Nat Resources, Key Lab Marine Geol & Metallogeny, Inst Oceanog 1, Qingdao 266061, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266237, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiting,Zhang, Mingyu,Li, Anchun,et al. Depositional control on carbon and sulfur preservation onshore and offshore the Oujiang Estuary: Implications for the C/S ratio as a salinity indicator[J]. CONTINENTAL SHELF RESEARCH,2021,227:11.
APA	Liu, Xiting.,Zhang, Mingyu.,Li, Anchun.,Fan, Daidu.,Dong, Jiang.,...&Wang, Houjie.(2021).Depositional control on carbon and sulfur preservation onshore and offshore the Oujiang Estuary: Implications for the C/S ratio as a salinity indicator.CONTINENTAL SHELF RESEARCH,227,11.
MLA	Liu, Xiting,et al."Depositional control on carbon and sulfur preservation onshore and offshore the Oujiang Estuary: Implications for the C/S ratio as a salinity indicator".CONTINENTAL SHELF RESEARCH 227(2021):11.