Artigo de periodico

An 11,000-year record of depositional environmental change based upon particulate organic matter and stable isotopes (C and N) in a lake sediment in southeastern Brazil (2018)

• Autores:
  • Lorente, Flávio Lima
  • Pessenda, Luiz Carlos Ruiz
  • Oboh-Ikuenobe, Francisca
  • Buso Júnior, Antonio Alvaro
  • Rossetti, Dilce
  • Giannini, Paulo César Fonseca
  • Cohen, Marcelo Cancela Lisboa
  • Oliveira, Paulo Eduardo de
• Autores USP: GIANNINI, PAULO CESAR FONSECA - IGC ; OLIVEIRA, PAULO EDUARDO DE - IGC ; PESSENDA, LUIZ CARLOS RUIZ - CENA ; LORENTE, FLAVIO LIMA - IO
• Unidades: IGC; CENA; IO
• DOI: 10.1016/j.jsames.2018.04.006
• Assuntos: HOLOCENO; ISÓTOPOS ESTÁVEIS; PALEOAMBIENTES
• Agências de fomento:
  • Financiamento CNPq
  • Financiamento FAPESP
• Idioma: Inglês
• Resumo: The aim of this paper is to reconstruct an 11,000-year history of depositional environmental change in southeastern Brazil, based upon the integration of particulate organic matter and stable isotope (C and N) data from a 136-cm sediment core from Lake Canto Grande. These proxies are used to explore the evolution of terrestrial and marine influence on the lake. Isotopic (δ13C: -7.8‰ to -31.9‰; δ15N: -0.07‰–4.9‰) and elemental (total organic carbon - TOC: 0.58%–37.19%; total nitrogen - TN: 0.08%–1.73%; C/N: 0.3 to 54.7) values recorded in Lake Canto Grande suggest that the sedimentary organic matter was derived from mostly C3 land plants and freshwater phytoplankton. Particulate organic matter and cluster analyses distinguished four associations characterized by the predominance of amorphous organic matter, followed by phytoclasts and palynomorphs. These results indicate two different phases of lake evolution. The first phase (136 - 65 cm; ∼10,943 cal yr. B.P. to ∼8529 cal yr. B.P.) is recorded by sand layers interbedded with mud, which contain amorphous organic matter (AOM, 45–59%) and phytoclasts (opaques - OP: 6–18%; non-opaques – NOP: 17–23%) which indicate a floodplain area. The second phase (65–0 cm; ∼8529 cal yr. B.P. to ∼662 cal yr. B.P.) comprises mud, AOM (68–86%) and palynomorphs (PAL, 8–16%) related to lake establishment comparable to modern conditions. Thus, characterizing particulate organic matter, in combination with stable isotopes, proved to be invaluable proxies for lacustrine paleoenvironmental change through the Holocene.
• Fonte:
  • Título: Journal of South American Earth Sciences
  • ISSN: 0895-9811
  • Volume/Número/Paginação/Ano: v. 84, p. 373-384, 2018

Informações sobre o DOI: 10.1016/j.jsames.2018.04.006 (Fonte: oaDOI API)
• Este periódico é de assinatura
• Este artigo é de acesso aberto
• URL de acesso aberto
• Cor do Acesso Aberto: green

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• ABNT

  LORENTE, Flávio Lima et al. An 11,000-year record of depositional environmental change based upon particulate organic matter and stable isotopes (C and N) in a lake sediment in southeastern Brazil. Journal of South American Earth Sciences, v. 84, p. 373-384, 2018Tradução . . Disponível em: https://doi.org/10.1016/j.jsames.2018.04.006. Acesso em: 10 out. 2025.

• APA

  Lorente, F. L., Pessenda, L. C. R., Oboh-Ikuenobe, F., Buso Júnior, A. A., Rossetti, D., Giannini, P. C. F., et al. (2018). An 11,000-year record of depositional environmental change based upon particulate organic matter and stable isotopes (C and N) in a lake sediment in southeastern Brazil. Journal of South American Earth Sciences, 84, 373-384. doi:10.1016/j.jsames.2018.04.006

• NLM

  Lorente FL, Pessenda LCR, Oboh-Ikuenobe F, Buso Júnior AA, Rossetti D, Giannini PCF, Cohen MCL, Oliveira PE de. An 11,000-year record of depositional environmental change based upon particulate organic matter and stable isotopes (C and N) in a lake sediment in southeastern Brazil [Internet]. Journal of South American Earth Sciences. 2018 ; 84 373-384.[citado 2025 out. 10 ] Available from: https://doi.org/10.1016/j.jsames.2018.04.006

• Vancouver

  Lorente FL, Pessenda LCR, Oboh-Ikuenobe F, Buso Júnior AA, Rossetti D, Giannini PCF, Cohen MCL, Oliveira PE de. An 11,000-year record of depositional environmental change based upon particulate organic matter and stable isotopes (C and N) in a lake sediment in southeastern Brazil [Internet]. Journal of South American Earth Sciences. 2018 ; 84 373-384.[citado 2025 out. 10 ] Available from: https://doi.org/10.1016/j.jsames.2018.04.006

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