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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2019-27
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-27
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 19 Mar 2019

Research article | 19 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Mid-Late Holocene event registered in organo-siliciclastic-sediments of Lagoa Salgada carbonate system, Southeast Brazil

Anna Paula Soares Cruz1, Cátia Fernandes Barbosa1, Angélica Maria Blanco1, Camila Areias de Oliveira1, Cleverson Guizan Silva2, and José Carlos Sícoli Seoane3 Anna Paula Soares Cruz et al.
  • 1Programa de Pós-Graduação em Geoquímica, Departamento de Geoquímica, Universidade Federal Fluminense, Outeiro São João Batista, s/n, Centro, Niterói, Rio de Janeiro CEP 24.020-141, Brazil
  • 2Programa de Pós-Graduação em Dinâmica dos Oceanos e da Terra, Departamento de Geologia, Universidade Federal Fluminense, Niterói, Rio de Janeiro, CEP 24.210-346, Brazil
  • 3Programa de Pós-Graduação em Geologia, Departamento de Geologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, CEP 21.941-916, Brazil

Abstract. The formation of Paraiba do Sul river delta plain in the coast of Rio de Janeiro state, Brazil, gave rise to diverse lagoons formed under different sea level regimes and climate variations. Sedimentary core lithology, organic matter geochemistry, and isotopic composition (δ13C and δ15N) were analyzed to interpret the sedimentation of the paleoenvironment of the Lagoa Salgada carbonate system. Different lithofacies reflect variations of the depositional environment. The abundance of silt and clay between 5.8 to 3.7 ka B.P., enhances the interpretation of a transgressive system, which promoted the stagnation of coarse sediment deposition due to coast drowning. Geochemistry data from this period (5.8–3.7 ka B.P.) suggest the dominance of a wet climate, with an increase of C3 plant and a marked dry event between 4.2–3.8 ka B.P. This dryer event also matches with previous published records from around the world, indicating a global event at 4.2 ka B.P. Between 3.8–1.5 ka B.P., Lagoa Salgada was isolated, sand and silt arrived at the system by erosion with the retreat of the ocean and less fluvial drainage. Geochemistry from this moment marks the changes to favourable conditions for microorganisms active in the precipitation of carbonates, forming microbial mats and stromatolites in the drier phase.

Anna Paula Soares Cruz et al.
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Short summary
Lagoa Salgada is a hipersaline lake investigated for its sedimentation history in order to interpret past climatic events. We studied the geochemistry of sediments from 5800 years ago until the present, finding sea level oscillations, different climatic conditions, and proxies for vegetation cover and productivity, which highlight a dry event 4200 years ago, which matches a global event of the same age, marking changes to favorable conditions for carbonates microbial mats and stromatolites.
Lagoa Salgada is a hipersaline lake investigated for its sedimentation history in order to...
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