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Considerations on premises of recent (< 120 years) sedimentation rate models with unsupported 210Pb: a study case of sediment cores from mud shelf depocenters

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Abstract

This study examines the impact of the constant sedimentation—CS premise on sedimentation rates, mass accumulation rates and age-depth results obtained from unsupported 210Pb models. The investigation is based on vertical profiles of 210Pb, 226Ra, 228Ra, 40K, and 137Cs measured through gamma spectrometry from seven sediment cores collected from the coastal region of southern Brazil. This region is known for harboring mud shelf depocenters. The mean sedimentation rate in the study area was estimated to be between 0.33 and 0.58 cm yr−1. The geographical disposition of the sampling sites allowed the identification of distinct sedimentological features, including a northernmost, middle shelf depocenter, a more coastal depocenter, and a region with sandy sediments deposited by wave-driven dynamics. The findings of this study have revealed that the decision to consider or exclude the CS premise can be made through a thorough examination of the vertical profiles of activities and the application of robust statistical analysis to identify outliers in the vertical profiles of mass accumulation rates. These important considerations play a crucial role in guiding researchers toward selecting the most appropriate approach to investigate sediment cores.

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Acknowledgements

The authors acknowledge the São Paulo Research Foundation (FAPESP) for the research Grant 2015/17763-2. MMM acknowledges the National Council of Scientific and Technological Development (CNPq) for the research Grant 300962/2018-5. The authors would also like to express their gratitude to the anonymous reviewers for their unvaluable contributions to this manuscript.

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  1. Instituto Oceanográfico da Universidade de São Paulo (IO-USP), Pça. Do Oceanográfico, 191, Butantã, São Paulo, SP, 05508 120, Brazil

    Paulo Alves de Lima Ferreira, Rubens Cesar Lopes Figueira, Michel Michaelovitch de Mahiques & Márcia Caruso Bícego

  2. Departamento de Oceanografia da Universidade Federal de Pernambuco (DOCEAN-UFPE), Cidade Universitária, Av. Arquitetura, S/N, Recife, PE, 50740-550, Brazil

    Bianca Sung Mi Kim

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  1. Paulo Alves de Lima Ferreira
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by PALF, BSMK and MMM. The first draft of the manuscript was written by PALF and MMM and all authors commented on all versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Paulo Alves de Lima Ferreira.

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Ferreira, P.A.d., Figueira, R.C.L., de Mahiques, M.M. et al. Considerations on premises of recent (< 120 years) sedimentation rate models with unsupported 210Pb: a study case of sediment cores from mud shelf depocenters. J Radioanal Nucl Chem 332, 4897–4915 (2023). https://doi.org/10.1007/s10967-023-09192-w

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