Abstract
The Pirai Trough and the Curitiba Basin, situated in the First Parana Plateau, are two areas of occurrence of clayey sediments accumulated during the Cenozoic in lowered faulted blocks. Both areas are little studied, the Curitiba Basin is included in the System of Cenozoic Rifts of Southeastern Brazil, the deposits of the Pirai Trough are still less known. Until recently characteristics and extension of lithofacies were not adequately known and neither the technological properties of the clayey sediments. This research aimed to study physical, chemical and morphologic characteristics of clays from these two areas. Methods included chemical and mineralogical characterization (scanning electron microscopy, energy dispersive spectrometry, X-ray diffractommetry, X-ray fluorescence, differential thermal analysis, thermogravimetric analysis) and technological characterization (sintering process, linear shrinkage, loss on ignition, apparent specific gravity, apparent porosity, water absorption, flexural resistance). The results indicate kaolinite predominance so much detrital how much diagenetic in the two studied depressions. In the Curitiba Basin occur also diagenetic smectite and illite. The technological properties indicate certain of the studied materials can be used in bricks and tiles.
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