<italic/>In<i> </i>situ<italic/> geochemical analysis of Mg/Ca ratios of planktonic foraminifera shells in the northeastern continental slope of the South China Sea

ZHANG Guanglu; YANG Jun; LONG Haiyan; ZHAO Yanyan; ZOU Li; WEI Haotian; LIU Sheng; YANG Dandan; SUN Guojing

doi:10.16562/j.cnki.0256-1492.2021122101

Marine Geology & Quaternary Geology > 2022 > 42(6): 43-58. > DOI: 10.16562/j.cnki.0256-1492.2021122101

ZHANG Guanglu，YANG Jun，LONG Haiyan，et al. In situ geochemical analysis of Mg/Ca ratios of planktonic foraminifera shells in the northeastern continental slope of the South China Sea[J]. Marine Geology & Quaternary Geology，2022，42(6)：43-58. DOI: 10.16562/j.cnki.0256-1492.2021122101

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In situ geochemical analysis of Mg/Ca ratios of planktonic foraminifera shells in the northeastern continental slope of the South China Sea

1.
Frontier Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Submarine Geosciences and Prospecting Techniques, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
3.
College of Environmental Science and Engineering, Qingdao 266100, China

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Received Date: December 20, 2021
Revised Date: March 18, 2022
Accepted Date: March 18, 2022
Available Online: June 08, 2022

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Abstract

Abstract

Planktonic foraminifera is one of the important materials that can provide the information of the physico-chemical environments. The development of in-situ microscopic analysis technology provides a new opportunity to carry out the detailed and intuitive understanding of the distribution and variation of trace elements in biological shells. At the same time, it also promotes the rapid development of paleoenvironmental inversion related research by using the element contents and ratios of the foraminifera shells microregion. In this paper, we used electron microprobe analysis (EPMA), laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and scanning electron microscopy (SEM) to conduct in-situ geochemical analysis of Mg/Ca in the four planktonic foraminifera shells of Globigerinoides ruber, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata and Globorotalia inflata in the surface sediments of the northeastern slope of the South China Sea. The results of electron microprobe mapping showed that G.ruber had periodic bands with high Mg contents, which might be associated with symbionts. However, N.dutertrei, P.obliquiloculata and G.inflata had thicker calcite crusts with low Mg contents. The results of LA-ICP-MS also showed that there were obvious low Mg/Ca calcite crusts with of N.dutertrei, P.obliquiloculata and G.inflata, while multiple sets of Mg/Ca ratios can be seen in the shells of G. ruber, which were consistent with the results of electron microprobe mapping. The distribution of Mg/Ca ratios in shells were affected by the biomineralization process of foraminifera, and the presence of contaminants also led to higher Mg/Ca ratios. Therefore, we conclude that the large variations of Mg/Ca ratios in foraminifera shells are not only affected by the surrounding seawater temperature, but also constrained by other factors. In addition, we found that reliable Mg/Ca ratios can be obtained by the LA-ICP-MS test. The application of this method can avoid the complex pretreatment process, and provide a technical basis for efficient, fast, high spatial resolution and low sample volume testing in the future.
- LA-ICP-MS,
- electron microprobe analysis,
- Mg/Ca ratios,
- temperature

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References (89)

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In situ geochemical analysis of Mg/Ca ratios of planktonic foraminifera shells in the northeastern continental slope of the South China Sea