| Texto completo | |
| Autor(es): |
Ferreira, Paulo Alves de Lima
;
Figueira, Rubens Cesar Lopes
;
de Mahiques, Michel Michaelovitch
;
Kim, Bianca Sung Mi
;
Bicego, Marcia Caruso
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY; v. 332, n. 12, p. 19-pg., 2023-10-24. |
| Resumo | |
This study examines the impact of the constant sedimentation-CS premise on sedimentation rates, mass accumulation rates and age-depth results obtained from unsupported Pb-210 models. The investigation is based on vertical profiles of Pb-210, Ra-226, Ra-228, K-40, and Cs-137 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. (AU) | |
| Processo FAPESP: | 15/17763-2 - Mudbelts do Sul e Sudeste do Brasil: implicações sobre as influências antrópicas no ambiente marinho |
| Beneficiário: | Márcia Caruso Bícego |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |