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Quaternary reactivation of a basement structure in the Barreirinhas Basin, Brazilian Equatorial Margin

Published online by Cambridge University Press:  20 January 2017

Raimundo Almeida-Filho ,
Dilce F. Rossetti ,
Fernando P. Miranda ,
Francisco J. Ferreira ,
Clauzionor Silva  and
Carlos Beisl
Raimundo Almeida-Filho*
Affiliation:
National Institute for Space Research-INPE, Caixa Postal 512, São José dos Campos, SP, Brazil
Dilce F. Rossetti
Affiliation:
National Institute for Space Research-INPE, Caixa Postal 512, São José dos Campos, SP, Brazil
Fernando P. Miranda
Affiliation:
Petrobras Research and Development Center-CENPES, Rio de Janeiro, RJ, Brazil
Francisco J. Ferreira
Affiliation:
Federal University of Paraná-UFPR, Curitiba, PR, Brazil
Clauzionor Silva
Affiliation:
Federal University of Amazonas, UFAM, Manaus, AM, Brazil
Carlos Beisl
Affiliation:
Federal University of Rio de Janeiro-UFRJ, Rio de Janeiro, RJ, Brazil
*
⁎Corresponding author. Fax: +55 12 39456488.

E-mail address:[email protected] (R. Almeida-Filho).

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Abstract

The Pirapemas Lineament is a remarkable 200-km-long, NE–SW trending structure in the Barreirinhas Basin, one of the several Brazilian coastal basins. This lineament splits the study area in two sectors of distinctive morphology, drainage patterns, and sedimentary covers. Terrain northward of the lineament presents a smooth topography with sub-parallel to sub-dendritic drainage patterns, whereas a dissected plateau characterized by incised valleys and rectangular drainage pattern occurs southward, suggesting a structural control by joints and faults. Geological field data, crossed with thermal luminescence (TL) and optically stimulated luminescence (OSL) dating, revealed that the surface southward of the lineament consists mostly of Miocene and late Pleistocene sedimentary deposits, represented by the Barreiras Formation and the Post-Barreiras sediments, respectively. In contrast, relatively younger sands mantle most of the northward terrain, as indicated by well-preserved paleodune deposits that grade into active aeolian dunes of the Lençóis Maranhenses National Park. Geomorphological and geological data analysis suggests that the northern sector is under the effect of subsidence, proving that the Pirapemas Lineament is an active agent modeling the landscape in the region. Geophysical data (gravity and seismic) confirm that such a structural feature is the surface expression of an active deep-seated basement fault.

Keywords

Remote sensingDeep-seated basement structureQuaternary reactivation
Type
Research Article
Information
Quaternary Research , Volume 72 , Issue 1 , July 2009 , pp. 103 - 110
Copyright
University of Washington

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