Detalhes do Artigo
[296904] The importance of moisture content in Pb-210 dating in sediments – Case study of the Fundão dam – Mariana (MG)
Autores: Mariana Ferreira Gonçalves, Ana Cristina de Melo Ferreira, José Marcus de Oliveira Godoy
Resumo: The Fundão dam, in Mariana, broke in November 2015, releasing more than 59 million m³ of tailings that reached almost 700 kilometers along the river, crossing the states of Minas Gerais and Espírito Santo, reaching the estuary and reaching the Atlantic Ocean. After the accident, several environmental impacts were recorded along the path affected by the tailings mud. IBAMA requested a historical survey of contamination, due to the burial process, layer by layer of sediments. Because there are no bathymetric surveys, the changes that occurred in these places are unknown. To obtain this information, Pb-210 dating will be applied. In the present study, nine sediment cores were collected in different locations in the states of Minas Gerais and Espírito Santo. Based on the moisture profile, it was possible to identify the cores that had the potential to provide a Pb-210 profile that could be dated. After this analysis, three cores showed behavior within the expected range for Pb-210 dating.