Fate of reactive iron in inner shelf sediments of the East China Sea in response to environmental evolution since the last deglaciation
KONG Fanxing1, ZHANG Zheyuan2, XU Fangjian3, DONG Jiang4, LI Anchun5, GU Yu1, HU Limin1, CHEN Tianyu2, LIU Xiting1
1 Key Laboratory of Submarine Geosciences and Prospecting Technology,College of Marine Geosciences,Ocean University of China, Shandong Qingdao 266100,China; 2 Center for Marine Geochemistry Research, State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China; 3 School of Marine Science and Engineering,Hainan University,Haikou 570228,China; 4 Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography of Ministry of Natural Resources, Shandong Qingdao 266061,China; 5 Key Laboratory of Marine Geology and Environment,Institute of Oceanology of Chinese Academy of Sciences, Shandong Qingdao 266071,China
Abstract：The reactive iron in shelf sediments plays an important role in the marine iron biogeochemical cycle,however,its response mechanism to the evolution of shelf sedimentary environments is still unclear. This study focuses on shelf sediments of core EC2005 from the East China Sea inner shelf to explore the influence of sedimentary environmental evolution on the fate of reactive iron since the last deglaciation. The average ratio of total iron to aluminum(FeT/Al)in core EC2005 sediments is 0.54,and the average ratio of reactive iron to total iron(FeHR/FeT)is 0.29,indicating that terrigenous fine-grained sediments input from the Changjiang River are the main source of particulate iron in the study area. The average content of reactive iron speciation from high to low is easily reducible(oxyhydr)oxide iron(Feox1,0.64%),pyrite iron(Fepy,0.32%),reducible(oxyhydr)oxide iron(Feox2,0.23%)and carbonate iron(Fecarb,0.09%). The relative contents of Fepy and Fecarb exhibit opposite trends along the core depth,indicating competition between carbonate(bicarbonate)ions and sulfide ions for ferrous iron during the early diagenetic process. This competition is primarily controlled by the sedimentary environment and redox state of the East China Sea inner shelf since the last deglaciation. Feox1 is closely related to the change of organic carbon content and plays an important role in controlling the variations of Fepy and Fecarb contents. In continental environments(17.3-13.1 ka),Feox1 is mainly converted into Fecarb,and Fepy content is almost zero. In transitional environments(13.1-7.3 ka),Fecarb content decreases accompanied by an increase in Fepy content. In marine environments(7.3 ka to present),Fepy content reaches a maximum,and Fecarb content increases significantly in the surface layers. Our findings highlight the control of the sedimentary environment on the fate of reactive iron in shelf sediments,providing a new perspective for studying modern and deep-time marine C-S-Fe biogeochemical cycles.
KONG Fanxing,ZHANG Zheyuan,XU Fangjian et al. Fate of reactive iron in inner shelf sediments of the East China Sea in response to environmental evolution since the last deglaciation[J]. JOPC, 2024, 26(6): 1483-1497.
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