Aeolian Deposition and Barrier Stratigraphy of the Transition Region between a Regressive and a Transgressive Barrier: an example from Southern Brazil

The transition region between regressive and transgressive barriers on the northern and central coastal sectors of Rio Grande do Sul (RS) in southern Brazil is represented by a 170 km long stretch of coast where the barrier shows a general aggradational/stationary (a/s) behavior on a long term time...

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Bibliographic Details
Published in:Journal of coastal research 2013-01, Vol.1 (65), p.464-464
Main Authors: Dillenburg, Sergio R, Barboza, Eduardo G, Tomazelli, Luiz J, Rosa, Maria L C C, Maciel, Gustavo S
Format: Article
Language:English
Subjects:
Aggradation
Barriers
Brazil
Coastal
Coastal environments
Coasts
Deposition
Eolian deposits
Morphology
Stratigraphy
Wind
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Summary:The transition region between regressive and transgressive barriers on the northern and central coastal sectors of Rio Grande do Sul (RS) in southern Brazil is represented by a 170 km long stretch of coast where the barrier shows a general aggradational/stationary (a/s) behavior on a long term time scale. In this study, approximately 50 km of this transition region was analyzed at four sites: Tramandai, Jardim do Eden, Cidreira and Dunas Altas. All barriers began forming around 7.8-7.2 ka. The northernmost site (Tramandai) has a typical a/s stratigraphy, and barrier morphology is dominated by transgressive dunefields. Ten km to the south, at Jardim do Eden, the barrier shows a transgressive stratigraphy, and barrier morphology is also dominated by transgressive dunefields. At Tramandai the maximum barrier height is around 4 m, with a maximum of 6 m, while at Jardim do Eden it averages 6 m, with a maximum of 11 m.
ISSN:0749-0208
1551-5036
DOI:10.2112/SI65-079