Utilização do Mmicroscópio Eletrônico de Varredura (MEV) para o reconhecimento de revestimentos argilosos
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Data
2003
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Resumo
Many authors have been pointing out the difficulties of identification of clay coatings in field and laboratory
observations. This work aims at estimating the importance of the Scanning Electron Microscopy (SEM) at the
characterization and identification of these pedologicals features found in Alfisols in Bauru (SP) region.
The studied region is located in the western part of São Paulo State, where the regional geology is
dominated by sedimentary rocks from Marília Formation of Bauru Group (Cretaceous period), associated with
soils of Alfisol and Oxisol type (figure 1).
The studies were developed at the INRA/Rennes Soil Science laboratory. A Phillips XL20 scanning
electron microscopy connected to an EDS spectrometer make the observation and punctual chemistry
characterization of the samples possible. Soil thin blades of small dimensions (4,5 X 7,0 cm) and small soil
lumps (1,0 cm³) with preserved structure were used.
The SEM showed to be an effective tool in soils genesis studies. The results showed that the clay
coatings found in the chambers porosity from the superior portion of argillic horizon in Alfisols present a clear
boundary with the immediately underlying soil materials, strong birrefringence, micro lamination, besides the
orientation of the clays parallel to the pores wall, indicating a mechanic illuviation process of the clay (figures
2 to 6).
The microanalyses done in clay coatings found in the argillic horizon, gave additional information to
those acquired from the micromorphological studies, especially for showing the existence of a strong variation
of the oxides elements through the micro laminations (figure 9 and table 1).
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Revestimentos argilosos, Clay coatings, Microscópio eletrônico de varredura, Argissolos, Scanning electron microscopy, Alfisols
Citação
SANTOS, Leonardo José Cordeiro; BERRIER, Janine; GRIMALDI, Michel; CASTRO, Selma Simões de. Utilização do Mmicroscópio Eletrônico de Varredura (MEV) para o reconhecimento de revestimentos argilosos. Boletim Paranaense de Geociências, Curitiba, n. 53, p. 35-43, 2003.