Unraveling Anthropocene Paleoenvironmental Conditions Combining Sediment and Foraminiferal Data: Proof-of-Concept in the Sepetiba Bay (SE, Brazil)

Silva, Layla Cristine da; Martins, Maria Virgínia Alves; Figueira, Rubens César Lopes; Frontalini, Fabrizio; Pereira, Egberto; Mello, Thaise Machado Senez; Castelo, Wellen Fernanda Louzada; Saibro, Murilo Barros; Francescangeli, Fabio; Sousa, Silvia Helena de Mello e; Bergamaschi, Sérgio; Antonioli, Luzia; Bouchet, Vincent M. P.; Terroso, Denise; Rocha, Fernando

doi:10.3389/fevo.2022.852439

Cited by 8 publications

(1 citation statement)

References 145 publications

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“…No entanto, perante a tamanho aumento da interferência antrópica e a presença de duas usinas nucleares (Angra 1 e Angra 2; Eletronuclear. 2019), acredita-se que, com o passar dos anos, a enseada da Ribeira deixou de ser um modelo de área pristina para comparação e background (Silva et al, 2022). A área de estudo se encontra na enseada da Ribeira na baia da Ilha Grande, Costa Verde do estado do Rio de Janeiro.…”

Section: Introductionunclassified

Geoquímica dos Sedimentos de Fundo da Enseada de Ribeira – Rio de Janeiro, Brasil.

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Souza²,

Cunha

et al. 2022

Rev. Bras. Geog. Fis.

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A baia da Ilha Grande circunda Angra dos Reis e Ilha Grande e apresenta influência antrópica tanto pela dinâmica das cidades ali instaladas, quanto pelo aumento da população quando em período de alta temporada – uma vez que esta é uma região turística. Soma-se a isso, o fato de estarem situadas nessa mesma região o Porto de Bracuhy e as duas usinas nucleares brasileiras (Angra 1 e 2), que se valem da enseada da Ribeira, localizada dentro da baia, para seu arrefecimento. Portanto esse estudo visa identificar os possíveis contaminantes nessa região, utilizando as concentrações de metais, através da análise de sedimentos de fundo. A coleta do sedimento de fundo foi realizada utilizando amostrador Van Veen. A digestão da amostra foi realizada em solução ácida e quantificada por Espectrometria de Massa Induzida por Plasma (EMPI) na qual se obteve a concentração multielementar de elementos maiores, menores e traços. A enseada da Ribeira tem seus metais fornecidos pelas atividades industriais da região, além de ter influência nos processos de sedimentação, dada pelos efluentes oriundos das usinas nucleares, e controlados por temperatura e salinidade. A partir da correlação das fontes, relacionou-se fontes naturais e antrópicas e suas concentrações média de elementos maiores e menores variam entre 6,32 e 0,06% e, os elementos traços apresentam concentrações médias entre 0,07 e 639 mg.kg -1, sendo os valores mais altos para bário, estrôncio e manganês. Estes elementos têm origem tanto antrópica quanto natural e são controlados por fatores como temperatura, correntes, procedência e natureza química de cada elemento.Palavras-chave: geoquímica ambiental, metais pesados, geologia costeira Geochemistry of the Bottom Sediments of the Ribeira Cove – Rio de Janeiro, Brazil.AbstractThe Ilha Grande bay has anthropogenic influence both due to the dynamics of the cities as well as the increase in population during high season – since this is a tourist region. Added to this, the fact that the Port of Bracuhy and the two Brazilian nuclear power plants (Angra 1 and 2), which use Ribeira Bay water for cooling processes. Therefore, this study aims to identify possible contaminants in this region, using metal concentrations, through the analysis of bottom sediments. The sampling of the bottom sediment was carried out using a Van Veen sampler; Digestion of the sample was carried out in acid solution and quantified by Inductive Plasma Mass Spectrometry ( ICP-MS) in which the multielemental concentration of major and trace elements was obtained, respectively. The Ribeira Bay has its metals supplied by industrial activities in the region, in addition to the influence on the sedimentation process, given by the effluents of the nuclear power plants, and controlled by temperature and salinity. From the correlation of sources, natural and anthropogenic sources surface distribution patterns were characterized, and their average concentrations of major and minor elements vary between 6.32 and 0.06%, and trace elements have average concentrations between 0.07 and 639 mg.kg -1, the highest values being for barium, strontium and manganese. These elements have both human and natural origin and are controlled by factors such as temperature, currents, origin and chemical nature of each element. Regardless of the fact that the results reveal less likelihood of adverse effects occurring, the increase in significant human interference in the ecosystem is indisputable, requiring constant and effective monitoring of aquatic systems such as the Ribeira Bay and conservation programs, in order not to allow the evolution of environmental degradation.Keywords: environmental geochemistry, heavy metals, coastal geology

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Section: Introductionunclassified

Geoquímica dos Sedimentos de Fundo da Enseada de Ribeira – Rio de Janeiro, Brasil.

Veiga

Souza²,

Cunha

et al. 2022

Rev. Bras. Geog. Fis.

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Assessment of anthropogenic pollution in Guanabara Bay (SE Brazil) through biogeochemical data and stable isotope mixing models

Senez-Mello,

Martins,

de Lima Ferreira

et al. 2024

Environ Sci Pollut Res

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Transfer of industrial contaminants from the inner to the outer region of Sepetiba Bay (SE Brazil) by dredge spoil dumping activities: a temporal record

Saibro,

Martins,

Guerra

et al. 2023

Environ Earth Sci

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A multiproxy approach involving grain size, geophysical (resistivity, magnetic susceptibility, and P-wave velocity), mineralogical (XRD), and geochemical (elemental, stable isotopes) data has been applied to core SP9 (128 cm long) to reconstruct natural and anthropogenic changes since ≈1850 AD (anno domine) (dating by 210Pb and 127Cs methods) in a distal region of Sepetiba Bay (SB), Rio de Janeiro State (SE Brazil). The analyzed core is a fine-grained sedimentary sequence (except its upper 20 cm). It comprises detrital particles derived from felsic and intermediate source rocks, as suggested by the fields defined by the biplot Zr vs TiO2 and the Al2O3/TiO2 ratios. Despite the increase in particle size at the top of the core, there was a progressive increase in the organic matter and potentially toxic elements (PTEs) contents and nutrients such as N and P. The geophysical data allowed us to identify the presence of subsurface (biogenic) gas, which suggests the occurrence of eutrophication processes in the study area despite its location in the outer region of the bay. Core SP9 records cyclical changes over the last ≈170 years in the mineralogical and elemental composition of the sediments and type of organic matter supplied to the bottom. These changes are associated with phases of more significant oceanic influence, salinity variations in the study area, and greater or lesser oxygen depletion in the sediment. These changes may have resulted from climatic oscillations or variations in the configuration and extension of the Ponta da Pombeba spit. The extent of this structure and the anthropic activities have contributed to the contamination of this area since 1975 AD. However, statistical analyses (Pearson correlations and principal components analysis) suggest that the transport and accumulation of PTEs (mainly Cd and Zn) did not strictly follow the general pattern of sedimentary dynamics prevailing in the studied area. Results indicate that this area became strongly polluted by Cd and Zn and with high ecological risk due to dredging and spoil disposal activities at sites close to the study area. It is noted that the environmental degradation reached higher levels here than in areas close to the primary source of the metals, the disabled Ingá Mercantil Company, in Madeira Island. This work demonstrates the temporal effect of dredge disposal activities in a distal region of Sepetiba Bay for the first time. It is a strong indicator that dredged spoil areas must be selected carefully, since healthy areas can become degraded due to the dumping of polluted waste.

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Unraveling Anthropocene Paleoenvironmental Conditions Combining Sediment and Foraminiferal Data: Proof-of-Concept in the Sepetiba Bay (SE, Brazil)

Cited by 8 publications

References 145 publications

Geoquímica dos Sedimentos de Fundo da Enseada de Ribeira – Rio de Janeiro, Brasil.

Geoquímica dos Sedimentos de Fundo da Enseada de Ribeira – Rio de Janeiro, Brasil.

Assessment of anthropogenic pollution in Guanabara Bay (SE Brazil) through biogeochemical data and stable isotope mixing models

Transfer of industrial contaminants from the inner to the outer region of Sepetiba Bay (SE Brazil) by dredge spoil dumping activities: a temporal record

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