NORTHEAST GUANABARA BAY AND COASTAL PLAIN HOLOCENE SEDIMENTARY EVOLUTION (BRAZIL): A CONTRIBUTION

Rodrigo Coutinho Abuchacra, Kita Chaves Damasio Macario, Maria Isabela Nascimento de Oliveira, Paula Ferreira Falheiro Abuchacra, Guilherme Borges Fernandez, Sérgio Cadena de Vasconcelos, Vitor Calôr de Oliveira, Yuri Nogueira Ressiguier, Alberto Garcia de Figueiredo Jr.

Abstract


Sedimentological and radiocarbon investigations are part of an ongoing research on the Bay-head delta of northeast Guanabara Bay, Rio de Janeiro State. Sediment accumulation indicates that the Holocene infill of the bay-head delta started around 8.2 kyr BP and was not in pace with the eustatic sea-level rise. Sediment accumulation was faster during the transgressive phase (0.56 cm.yr-1). However, during the regressive phase, progradation driven by base-level fall was predominant over vertical sediment accumulation (0.02 cm.yr-1). Based on coring, three sedimentary units were defined: fluvial sands (U1), estuarine deposits (U2) and fluvial mud (U3).


Keywords


Guanabara Bay. Sediment Accumulation. Marine Transgression and Regression

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DOI: https://doi.org/10.12957/jse.2017.27951

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