Cite this paper:
Xie Xingwei, Yuan Huamao, Song Jinming, Duan Liqin, Liang Xianmeng, Wang Qidong, Ren Chengzhe, Wang Yueqi. Response of redox sensitive elements to changes of sedimentary environment in core sediments of seasonal low-oxygen zone in East China Sea[J]. Haiyang Xuebao, 2020, 42(2): 30-43

Response of redox sensitive elements to changes of sedimentary environment in core sediments of seasonal low-oxygen zone in East China Sea

Xie Xingwei1,2,3, Yuan Huamao1,2,3,4, Song Jinming1,2,3,4, Duan Liqin1,3,4, Liang Xianmeng1,2,3, Wang Qidong1,3,4, Ren Chengzhe1,2,3, Wang Yueqi1,2,3
1. Key Laboratory of Marine Ecology and Environmental Sciences of Chinese Academy Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China;
4. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
Redox sensitive elements (Redox Sensitive Elements, RSE) such as V, Cr, Mo and U, et al. are dissolved under oxidation conditions. They are reduced to low-valent state under reducing sedimentary environment and transferred to sediments for enrichment and accumulation. Therefore, the enrichment of redox sensitive elements in sediments can be used to invert the redox status of sedimentary environment. In this paper, the vertical distribution, enrichment characteristics and ratios of redox sensitive elements V, Cr, Ni, Cu, Zn, Mo and U in the Zb7 core sediment in the seasonal low-oxygen sea area of East China Sea were studied. It was found that RSE/Al and enrichment coefficient had increased since 1978, but had decreased since 2009. The overall RSE enrichment coefficient was less than 3, and no obvious enrichment had been observed. RSE ratios V/Cr<2, Ni/Co<5, U/Th<0.75, 0.25<(Cu+Mo)/Zn<0.55 and MoEF/UEF ratios were mainly distributed between 0.08 and 0.3 times of seawater Mo/U ratios, indicating the oxidized sedimentary environment. RSE/Al was significantly correlated with Fe/Al and Mn/Al, which indicated that RSE entered sediments mainly by combining with Fe and Mn oxides after removing terrigenous debris inputs, and also indicated the oxidized sedimentary environment. The results were inconsistent with the results of seasonal hypoxia reflected by the historical data of dissolved oxygen in this region. It may be related to the absence of RSE enrichment signals in the sediments during seasonal hypoxia in summer after the recovery of dissolved oxygen levels in autumn and winter. Although RSE can not effectively indicate the seasonal hypoxic environment in the East China Sea, the increase of RSE enrichment in Zb7 after 1978 and the decrease after 2009 reflected to some extent the trend of seasonal hypoxia aggravating in the region since 1978 and easing after 2009.
Key words:    redox sensitive elements    sedimentary environment    marine sediments    seasonal low-oxygen    East China Sea   
Received: 2019-02-18   Revised: 2019-12-09
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