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LAGOA SALGADA: AN OVERVIEW OF A BRAZILIAN HYPERSALINE LAGOON ENVIRONMENTAL STUDIES OVER THE LAST 5000 YEARS USING RADIOCARBON DATE CORRECTIONS

2023; Cambridge University Press; Volume: 65; Issue: 6 Linguagem: Inglês

10.1017/rdc.2023.83

1945-5755

MI Oliveira, Carla Carvalho, Ayrton Assumpção, Kita Macário, Daniel Rufino Amaral, Carlos Fernando Barbosa, Fabiana Oliveira, Anelize M. Bahniuk, Carlos Vasconcelos, Anna Paula Soares Cruz, A. Blanco,

Paleontology and Stratigraphy of Fossils

ABSTRACT The Lagoa Salgada is located in the Paraíba do Sul river delta plain on the coast of Rio de Janeiro state, Brazil, and is one of the few lagoons in the world that have well-developed recent stromatolites. Lagoa Salgada is a hypersaline lagoon formed in a very complex environmental system subjected to terrestrial and oceanic influences under different sea level regimes and climate variations. In addition, sediment and stromatolites are characterized by unusually positive inorganic δ 13 C VPDB values. For this reason, it has been the target of several geological and paleoenvironmental studies, which, in their great majority, require a geochronological technique in order to determine the changes in the environment over time. When radiocarbon ( 14 C) dating is used, it is necessary to consider some details as the source of 14 C in the environment and perform 14 C ages calibration accordingly. In the present paper, a bibliographic survey was carried out in order to review the data treatment and improve the environmental evolution discussion based on accurate calibration. Using the Marine20 curve and an undetermined ΔR, we generated growth and depositional models to establish an overview of the formation of this lagoon.