Sequential extraction procedure and element occurrence states of hydrothermal sediments from the South Atlantic Ridge

Zhang Ying; Yang Baoju; Li Chuanshun; Wang Xiaojing; Wang Hongmin; Liu Jihua

doi:10.12284/hyxb2021057

Volume 43 Issue 3

Apr. 2021

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Zhang Ying，Yang Baoju，Li Chuanshun, et al. Sequential extraction procedure and element occurrence states of hydrothermal sediments from the South Atlantic Ridge[J]. Haiyang Xuebao，2021, 43(3)：90–104 doi: 10.12284/hyxb2021057

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Sequential extraction procedure and element occurrence states of hydrothermal sediments from the South Atlantic Ridge

doi: 10.12284/hyxb2021057

Zhang Ying^{1, 2, 3
,},
Yang Baoju^{1, 2, 3},
Li Chuanshun^{1, 2, 3},
Wang Xiaojing^{1, 2, 3},
Wang Hongmin^{1, 2, 3},
Liu Jihua^{1, 2, 3
,
,}

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Key Laboratory of Marine Geology and Metallogeny, Ministry of Natural Resources, Qingdao 266061, China
3.
Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China

Received Date: 2020-02-14
Rev Recd Date: 2020-06-28

Available Online: 2021-02-25

Publish Date: 2021-04-23

Abstract

Abstract

In this study, elemental and mineral compositions of three surface sediments collected from the South Atlantic Ridge affected by hydrothermal activities of various degrees were analyzed, and series of extraction experiments for carbonate phase, Fe-Mn oxide phase and insoluble residual phase were carried out. Mixed reagent of hydroxylamine hydrochloride (HH) with different concentrations and 25% acetic acid (HAc) were used to extract Fe-Mn oxide phase from the sample. In order to corroborate the reliability of the extracting methods, Ti/Nd and Ti/Pb ratios of the Fe-Mn oxide phase, rare earth elements (REE) patterns as well as δCe and δEu ratios of different chemical phase were used to determine that the ideal reagent conditions for extracting Fe-Mn oxide phase from three different types of hydrothermal sediments were all 0.5 mol/L HH in 25% acetic acid. The results show that the higher the degree of influence of hydrothermal activities, the higher the contents of Fe, Cu, Zn and other elements in the sediments, and the contents of Ca, Sr and Ba show an opposite trend. Manganese, Pb and REE are not significantly affected by hydrothermal activities. As the influence of hydrothermal activity increases, the proportion of Ca, Sr and Nd increases in the Fe-Mn oxide phase and decreases in the residual phase, while Mn, Co, Ni and Zn have an opposite trend, and the proportion of Cu increases in the carbonate phase and decreases in the residual phase. Lead is not affected by the influence strength of hydrothermal activity and mainly occurs in the Fe-Mn oxide phase. REE mainly occur in the residue state. The occurrence state of REE shows that the more significant influence by the hydrothermal activities of the sediments, the more enrichment of REE in the residual phase. And the chondrite-normalized REE patterns of the residual phase exhibit that the enrichment of light REE are less obvious. This study provides methods for extracting hydrothermal fractions and valuable geochemical data for further understanding of the characteristics of hydrothermal sediments and the effects of hydrothermal activities on the occurrence state of elements in the South Atlantic Ridge.
- South Atlantic Ridge,
- hydrothermal sediment,
- sequential leaching,
- element occurrence states

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References

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