ANALYSIS OF PARTICULATE ORGANIC MATTER IN HOLOCENE SEDIMENTS OF COASTAL PLAIN FROM PERO BEACH, CABO FRIO, RIO DE JANEIRO, BRAZIL

Authors

  • Taísa Camila Silveira de Souza Programa de Pós Graduação em Dinâmica dos Oceanos e da Terra, Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia, 24210 -346, Niterói, Rio de Janeiro, RJ, Brazil
  • Marcelo de Araujo Carvalho Laboratório de Paleoecologia Vegetal, Departamento de Geociências do Museu Nacional/ UFRJ. Av. D. Pedro II s/nº - Quinta da Boa Vista, Rio de Janeiro, RJ
  • Fabio Ferreira Dias Departamento de Análise Geoambiental, Universidade Federal Fluminense, Avenida Litorânea s/n, 24210-340 Niterói, RJ, Brasil
  • Cintia Ferreira Barreto Programa de Pós Graduação em Dinâmica dos Oceanos e da Terra, Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia, 24210 -346, Niterói, Rio de Janeiro, RJ, Brazil
  • Alex da Silva de Freitas Programa de Pós Graduação em Dinâmica dos Oceanos e da Terra, Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia, 24210 -346, Niterói, Rio de Janeiro, RJ, Brazil
  • João Wagner de Alencar Castro Laboratório de Geologia Costeira, Sedimentologia e Meio Ambiente, Departamento de Geociências do Museu Nacional/ UFRJ. Av. D. Pedro II s/nº - Quinta da Boa Vista, Rio de Janeiro, RJ, Brazil

DOI:

https://doi.org/10.12957/jse.2016.23096

Keywords:

palynofacies, paleoenvironmental reconstruction, Holocene, coastal region

Abstract

The study of palynofacies along a core drilled on the coastal plain of Cabo Frio, State of Rio de Janeiro, was carried out in order to contribute to the knowledge of the paleoenvironmental evolution of the Pero Beach region. The ages obtained from 14C datings allowed to verify that the studied core records the past 6761 ± 130 yrs cal BP. Thirty samples were prepared by standard methodology for palynofacies. About three hundred particles of the particulate organic material was classified and recorded for each sample. Statistical methods were employed for the associations of particulate organic matter (R-mode cluster analysis) and levels (samples; Q-mode cluster analysis) analyzed along the core. Furthermore, the ratio Phytoclast - Total Organic Carbon (Phy-TOC) was used to verify the proximity of the source area. The three major groups of particulate organic matter found along the studied core are Phytoclasts, Amorphous Organic Matter (AOM) and Palynomorphs. The samples showed in general, a predominance of phytoclasts (73.2%), followed by AOM (18.6%) and Palynomorphs (8.2%). Supported by statistical analysis, it was possible to deduce that the study area evolved since the middle Holocene from a marine environment to a paleolagoon

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Published

2016-06-28

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Section

Research article