Probable geological significance of the OSL (optically stimulated luminescence) ages of the Itaquaquecetuba formation, SP

Authors

  • Kenitiro Suguio Universidade de Guarulhos; Centro de Pós-graduação Pesquisa e Extensão
  • Claudio Riccomini Universidade de Guarulhos; Centro de Pós-graduação Pesquisa e Extensão
  • Alethéa Ernandes Martins Sallun Secretaria do Meio Ambiente do Estado de São Paulo; Instituto Geológico
  • William Sallun Filho Secretaria do Meio Ambiente do Estado de São Paulo; Instituto Geológico
  • Pedro Aronchi Neto Universidade de São Paulo; Instituto de Geociências; Departamento de Geologia Sedimentar e Ambiental

DOI:

https://doi.org/10.5327/Z1519-874X2010000300004

Keywords:

Quaternary, Paleogene, Itaquaquecetuba Formation, São Paulo basin, OSL age, Fluvial deposits

Abstract

The Itaquaquecetuba Formation can be considered as relatively well-known from a paleontological viewpoint. Its fossil content, which is very rich and represented by plants (tree trunks, seeds and leaves) and palynomorphs, has been studied in detail, allowing several authors to suggest different ages and depositional conditions for this unit in terms of paleoclimate and paleoenvironment. At the present state of knowledge, the age assumed of this formation is Paleogene (upper Eocene to lower Oligocene) or Neogene (Miocene), although controversies still remain about the depositional paleoclimate and paleoenvironment. More recently, OSL (Optically Stimulated Luminescence) depositional ages between 47,000 ± 6,000 and 89,000 ± 12,000 years were obtained from samples of sands from the Itaquareia sand pit located in the city of Itaquaquecetuba (São Paulo state). These ages correspond to the Pleistocene (Quaternary) and are correlatable with the time of the Wisconsin Glaciation in North America. Considering these new data and some stratigraphic aspects which were unknown before this study, great part of the Itaquaquecetuba Formation, which outcrops in the Itaquareia sand pit, is here interpreted as a Quaternary fluvial channel deposit.

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Published

2010-10-01

Issue

Vol. 10 No. 3 (2010)

Section

Articles

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How to Cite

Suguio, K., Riccomini, C., Sallun, A. E. M., Sallun Filho, W., & Aronchi Neto, P. (2010). Probable geological significance of the OSL (optically stimulated luminescence) ages of the Itaquaquecetuba formation, SP . Geologia USP. Série Científica, 10(3), 49-56. https://doi.org/10.5327/Z1519-874X2010000300004