Continental dunes in Brazil as geochronometers of paleoclimatic variations
a review of the state of the art of knowledge
DOI:
https://doi.org/10.18055/Finis28868Abstract
Continental dunes are key features for the study of climatic oscillations that occurred
during the Quaternary. These deposits occur in different spatial contexts in Brazil and reflect
their formative paleoenvironmental and paleoclimatic conditions. The present work proposes
a synthesis of the literature on the subject over the last 30 years, integrating geochronological and environmental information on the continental dunes present in the Brazilian territory.
The data from dating by LOE and TL indicate the occurrence of wind deposition from the
Middle Pleistocene (253.8±19.0ka) to the present (0.165±0.025ka) with alternation between
periods of lower and higher activity. Parabolic dunes, sand sheets, and deflation basins
(blowouts) predominate in the studied areas. Cyclical and anomalous mechanisms, such as
Palei-ENSO, appear to have been responsible for the onset of drier phases, leadind to a greater
supply of sediments and the consequent formation of dune deposits. The good resolution of
the chronological data also suggests that the dunes act as important geo-archives for studying
environmental changes with medium to short recurrence intervals.
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