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Paleoenvironmental reconstruction of a Late Quaternary lagoon system in southern Brazil (Jaguaruna region, Santa Catarina state) based on multi-proxy analysis

Authors

  • Paula Garcia Carvalho do Amaral,

    Corresponding author
    1. Instituto de Geociências, Departamento de Geologia Sedimentar e Ambiental, Universidade de São Paulo, São Paulo, Brazil
    2. CEREGE, Aix-Marseille Université-CNRS-IRD, Aix-en-Provence, France
    Current affiliation:
    1. CEREGE, Europôle de l'Arbois BP 80, 13545, Aix-en-Provence Cedex 4, France.
    • P. G. C. Amaral, at †present address below.
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  • Paulo César Fonseca Giannini,

    1. Instituto de Geociências, Departamento de Geologia Sedimentar e Ambiental, Universidade de São Paulo, São Paulo, Brazil
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  • Florence Sylvestre,

    1. CEREGE, Aix-Marseille Université-CNRS-IRD, Aix-en-Provence, France
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  • Luiz Carlos Ruiz Pessenda

    1. Laboratório de Carbono 14, CENA/USP, Piracicaba, SP, Brazil
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Abstract

This paper provides a paleoenvironmental reconstruction of a Late Quaternary lagoon system in the Jaguaruna region of Santa Catarina state, southern Brazil. Integrated results of bulk sedimentary organic matter characterization (δ13C, δ15N and C/N), microfossil (pollen and diatom) and grain-size analysis from three shallow cores (∼2.5 m depth) allowed us to propose an evolving paleogeographic scenario in this coastal region for the last ca. 5500 cal a BP. The lagoonal system in this area was more extensive during the mid-Holocene than today, with a gradual and continuous lagoon–sea disconnection until the present. We add to the debate regarding relative sea-level (RSL) variations for the Brazilian coast during the Holocene and discuss the importance of sedimentary dynamics for interpreting changes in coastal ecosystems. The multi-proxy analysis suggests that changes in coastal ecosystems could be directly related to local sedimentary processes, which are not necessarily linked to RSL fluctuations and/or to climatic variations. Copyright © 2011 John Wiley & Sons, Ltd.

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