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Depositional control on the fate of reactive iron in shelf sediments since the last deglaciation: A case study of the East China Sea

文献类型：期刊论文

作者Kong, Fanxing2; Liu, Xiting2,3; Li, Anchun4; Dong, Jiang8; Wang, Houjie2,3; Zhuang, Guangchao1; Zhang, Zihu5,6,7; Li, Chao5,6,7
刊名MARINE GEOLOGY
出版日期2024-09-01
卷号475页码:13
关键词Reactive iron Depositional environment Redox state Source-sink East China Sea
ISSN号0025-3227
DOI10.1016/j.margeo.2024.107358
通讯作者Liu, Xiting(liuxiting@ouc.edu.cn)
英文摘要The East China Sea (ECS) is located between the Eurasian continent and the Pacific Ocean with a wide continental shelf, which acts as a potential source of reactive iron in the Western Pacific. However, the source and fate of reactive iron in continental shelf sediments of the ECS remain poorly constrained. Here, we examined the influence of the depositional environment on the fate of reactive iron on the continental shelf of the ECS since the last deglaciation. The contents of redox-sensitive elements (U and Mo) indicate that the sediments in the ECS inner shelf have primarily deposited in oxic and suboxic environments since 18.5 ka. The ratio of reactive iron to total iron (Fe HR /Fe T ) ranges from 0.24 to 0.41, and the ratio of total iron to aluminum (Fe T /Al) is approximately 0.55 +/- 0.11. These ratios suggest that the majority of reactive iron is derived from fine-grained terrestrial sediments discharged by the Changjiang River. The contents of Fe py and Fe carb exhibit opposite trends with depth in the core, indicating competition between carbonate (bicarbonate) ions and sulfide ions for ferrous ions. This competition is primarily controlled by the depositional environment and redox state since 18.5 ka. The Fe carb is the dominant iron speciation throughout the core sediments, but its abundance declined since 13.2 ka when the ECS inner shelf was influenced by seawater transgression due to deglacial sea-level rise. The Fe py content reached its maximum when the ECS inner shelf was fully flooded. Our study highlights the depositional control on the source-sink processes of reactive iron, providing new insights into the fate of reactive iron on continental shelves in response to environmental evolution.
WOS关键词ORGANIC-CARBON ; CONTINENTAL-SHELF ; INNER SHELF ; PALEOREDOX PROXIES ; CHANGJIANG ESTUARY ; SURFACE SEDIMENTS ; PYRITE FORMATION ; SPECIATION ; SULFUR ; OCEAN
资助项目National Natural Science Foundation of China[42276060] ; Natural Science Foundation of Shandong Province[ZR2021YQ26]
WOS研究方向Geology ; Oceanography
语种英语
WOS记录号WOS:001267965300001
出版者ELSEVIER
源URL[http://ir.qdio.ac.cn/handle/337002/186287]  
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.Ocean Univ China, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China
2.Ocean Univ China, Coll Marine Geosci, Key Lab Submarine Geosci & Prospecting Technol, Qingdao 266100, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
5.Chengdu Univ Technol, Int Ctr Sedimentary Geochem & Biogeochem Res, Chengdu 610059, Peoples R China
6.Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China
7.Chengdu Univ Technol, State Key Lab Oil Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China
8.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China
推荐引用方式
GB/T 7714		 Kong, Fanxing,Liu, Xiting,Li, Anchun,et al. Depositional control on the fate of reactive iron in shelf sediments since the last deglaciation: A case study of the East China Sea[J]. MARINE GEOLOGY,2024,475:13.
APA Kong, Fanxing.,Liu, Xiting.,Li, Anchun.,Dong, Jiang.,Wang, Houjie.,...&Li, Chao.(2024).Depositional control on the fate of reactive iron in shelf sediments since the last deglaciation: A case study of the East China Sea.MARINE GEOLOGY,475,13.
MLA Kong, Fanxing,et al."Depositional control on the fate of reactive iron in shelf sediments since the last deglaciation: A case study of the East China Sea".MARINE GEOLOGY 475(2024):13.

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来源：海洋研究所

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