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Did Sea-Level Changes Affect the Brazilian Amazon Forest during the Holocene?

Published online by Cambridge University Press:  02 August 2017

Mayra Nina Araujo Silva ,
Marcelo C L Cohen ,
Dilce F Rossetti  and
Luiz C R Pessenda
Mayra Nina Araujo Silva
Affiliation:
Graduate Program of Geology and Geochemistry, Federal University of Pará. Av. Perimentral 2651, Terra Firme, 66077–530, Belém (PA), Brazil
Marcelo C L Cohen*
Affiliation:
Graduate Program of Geology and Geochemistry, Federal University of Pará. Av. Perimentral 2651, Terra Firme, 66077–530, Belém (PA), Brazil
Dilce F Rossetti
Affiliation:
National Space Research Institute (INPE), Rua dos Astronautas 1758–CP 515, CEP:12245–970, São José dos Campos (SP), Brazil
Luiz C R Pessenda
Affiliation:
University of São Paulo, 14C Laboratory, Av. Centenário 303, 13400–000, Piracicaba, São Paulo, Brazil
*
*Corresponding author. Email: mcohen80@hotmail.com.
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Abstract

In order to contribute to the discussion of Holocene climate changes, four sediment cores were collected from the northern Brazilian Amazonia lowland. These cores were studied through pollen analysis and sedimentary features, and the results were discussed within a chronological framework provided by radiocarbon dating. The cores were sampled from fluvial terraces representative of channel, floodplain/lake and crevasse splay deposits formed since the mid-Holocene. The pollen samples derive from floodplain/lake deposits and the pollen grains are mainly composed by families Moraceae, Euphorbiaceae, Caesalpiniaceae, Fabaceae, Rubiaceae, Melastomataceae, Combretaceae, Sapindaceae, Poaceae, Cyperaceae, Aizoaceae, Apiaceae and genus Sebastiana. The pollen data suggest no significant vegetation changes in the study area for the past 4808–4886 cal yr BP. This led to proposing stable climatic conditions since at least the middle Holocene. Such a finding is contrary to the occurrence of a dry period during the middle Holocene. The stabilization of the relative sea level about 6000 cal yr BP along the northern Brazilian littoral may have influenced the water table, and favored the establishment and maintenance of Amazonian lowland forest during the mid- and late Holocene. In addition, this process may have attenuated the impact of that dry period in areas under most fluvial influence.

Keywords

AmazoniaBranco RiverclimateHolocenepalynologysea level
Type
Research Article
Information
Radiocarbon , Volume 60 , Issue 1 , February 2018 , pp. 91 - 112
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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