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The initial exploration for 26Al chronology in deep-sea ferromanganese crust

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Abstract

Background

The deep-sea ferromanganese crust (DSFC) is a natural archive for recording the history of the Earth’s evolution, as one of the most common authigenic assemblages in marine sediments. Although the depositional age dating using meteoric 10Be has been successfully used in the study on the chronology of DSFC, the research on 26Al has not seen relevant reports in this aspect due to the influence of factors such as measurement sensitivity and 26Al in situ production.

Method

The first exploration for 26Al chronology in DSFC was carried out by using accelerator mass spectrometry (AMS) measurements of 10Be and 26Al, and the comparison of relationship between isotopic ratios and concentrations of Al and Be.

Results

The growth rates of G.R = (1.44 ± 0.09) mm/Ma, (3.58 ± 0.29) mm/Ma, (1.52 ± 0.10) mm/Ma and (2.93 ± 0.14) mm/Ma are derived using 10Be/9Be, 26Al/27Al ratios, 10Be and 26Al concentrations, respectively. 

Conclusion

The 26Al chronological methods have been explored based on a DSFC sample and encouraging results were obtained. The results are preliminary and insufficient; some information is still needed to explain the difference between 26Al and 10Be chronology.

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Acknowledgements

This work was mainly supported by the National Natural Science Foundations of China (NSFC), under Grant No.11775157, and the Central Government Guidance Funds for Local Scientific and Technological Development, China under Grant No. Guike ZY22096024. The authors gratefully acknowledge the China Ocean Sample Repository for the supply of the deep-sea ferromanganese crust sample.

Funding

National Natural Science Foundation of China, 11775157, Kejun Dong.

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Correspondence to Kejun Dong.

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Dong, K., Hu, Y., Cui, L. et al. The initial exploration for 26Al chronology in deep-sea ferromanganese crust. Radiat Detect Technol Methods 7, 297–303 (2023). https://doi.org/10.1007/s41605-023-00386-0

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