Palynological record of the Late Pleistocene sedimentary deposits on the Rio Madeira, Rondônia, Brazilian Amazon

Authors

  • Maria Ecilene Nunes da Silva Meneses Universidade Federal do Tocantins
  • Etiene Fabbrin Pires Universidade Federal do Tocantins
  • Átila Augusto Stock da Rosa Universidade Federal de Santa Maria
  • Luciano Artemio Leal Universidade Estadual do Sudoeste da Bahia
  • Laís Aguiar da Silveira Mendes Universidade Federal do Tocantins
  • Milton José de Paula Universidade Federal do Tocantins
  • Francisco Edinardo Ferreira de Souza Universidade Federal do Tocantins
  • José Rafael Wanderley Benício Universidade Federal do Tocantins
  • Leomir dos Santos Campos Universidade Estadual do Sudoeste da Bahia

DOI:

https://doi.org/10.5935/0100-929X.20120009

Keywords:

Palynology, Late Pleistocene, Vegetation, Rondônia state, Brazilian Amazon.

Abstract

The present paper presents a study of identification of palynological assemblages from a layer of sediment taken from a modern forested area situated in the upper course of the Madeira River, within the region of influence of the AHE Jirau, Rondônia, Brazilian Amazon. Radiometric carbon dating using 14C (AMS method) furnished ages between 41,350 and 43,500 years Before Present (B.P.), or Late Pleistocene, for the studied layer. The results reveal a set of palynomorphs marked by low diversity of pollen families with predominantly tropical forest types showing an upward increase in pollen grains typical of wet environments, probably suggesting the installation of a swamp. No other vegetational change was observed during the period recorded in this study, and in general the data are in agreement to palynological records obtained from other areas of the Amazon forest region that indicate a steady forested environment for the same period.

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Published

2012-12-01

Issue

Vol. 33 No. 2 (2012)

Section

RIG050

License

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