Contribution to the Stratigraphy of the Onshore Paraiba Basin, Brazil

Autor(es)

Rossetti, Dilce F. ^[1] ; Goes, Ana M. ^[2] ; Bezerra, Francisco H. R. ^[3] ; Valeriano, Marcio M. ^[1] ; Brito-Neves, Benjamin B. ^[2] ; Ochoa, Felipe L. ^[2]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, Div Sensoriamento Remoto, BR-12245910 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo - Brazil

^[3] Univ Fed Rio Grande do Norte UFRN, Dept Geol, Ctr Ciencias Exatas & Terra, BR-59078970 Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 84, n. 2, p. 313-333, JUN 2012.
• Citações Web of Science: 10

Resumo

Several publications have contributed to improve the stratigraphy of the Paraiba 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 Paraiba 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 Paraiba Basin. (AU)

• Processo FAPESP: 06/04687-7 - Integração de sedimentologia, sensoriamento remoto e geoquímica aplicada ao mapeamento da sucessão Cretáceo-Terciária na porção Central da Bacia Paraíba
• Beneficiário: Dilce de Fátima Rossetti
• Modalidade de apoio: Auxílio à Pesquisa - Regular