Contribution to the stratigraphy of the onshore Paraíba Basin, Brazil

Anais da Academia Brasileira de Ciências

Dilce F. Rossetti²  Ana M. Góes¹  Francisco H.r. Bezerra¹  Márcio M. Valeriano²  Benjamim B. Brito-neves¹  Felipe L. Ochoa¹ 

[1] ,Instituto Nacional de Pesquisas Espaciais Divisão de Sensoriamento Remoto São José dos Campos SP ,Brasil

关键词: morphology;    sedimentology;    stratigraphy;    chronology;    tectonics;    Paraíba Basin;    morfologia;    sedimentologia;    estratigrafia;    cronologia;    tectônica;    Bacia Paraíba;   

DOI  :  10.1590/S0001-37652012005000026

来源: SciELO

【 摘 要 】

Several publications have contributed to improve the stratigraphy of the Paraíba Basin in northeastern Brazil. However, the characterization and distribution of sedimentary units in onshore areas of this basin are still incomplete, despite their significance for reconstructing the tectono-sedimentary evolution of the South American passive margin. This work provides new information to differentiate among lithologically similar strata, otherwise entirely unrelated in time. This approach included morphological, sedimentological and stratigraphic descriptions based on surface and sub-surface data integrated with remote sensing, optically stimulated luminescence dating, U+Th/He dating of weathered goethite, and heavy mineral analysis. Based on this study, it was possible to show that Cretaceous units are constrained to the eastern part of the onshore Paraíba Basin. Except for a few outcrops of carbonatic rocks nearby the modern coastline, deposits of this age are not exposed to the surface in the study area. Instead, the sedimentary cover throughout the basin is constituted by mineralogically and chronologically distinctive deposits, inserted in the Barreiras Formation and mostly in the Post-Barreiras Sediments, of early/middle Miocene and Late Pleistocene-Holocene ages, respectively. The data presented in this work support tectonic deformation as a factor of great relevance to the distribution of the sedimentary units of the Paraíba Basin.

【 授权许可】

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