Revista Brasileira de GeociênciasABSTRACT Mesozoic-Cenozoic transcurrent tectonics in the Lages Dome, Santa Catarina. This work presents the multiscale study of structural lineaments that affect alkaline rocks associated to the Lages Dome, situated in the Eastern edge of the Paraná Basin, Santa Catarina state, Brazil. We analyzed satellite images (Landsat-TM) and Shuttle Radar Topography Mission (SRTM) project and carried out structural studies of alkaline rocks in quarries of the dome. The results show correlation between the lineaments extracted from the images and faults analyzed in quarries, especially around the NS directions (NNE to NNW) and EW (ENE to ESE) and, secondarily, NE and NW. These structures are largely related to reactivation of basement discontinuities. The first two directions correspond to dextral and sinistral transcurrent faults, respectively. Formation of these structures is compatible with a field of tension with axis oriented NE-SW, whose age ranges from the Late Cretaceous and Tertiary.
Este trabalho apresenta o estudo dos lineamentos estruturais na região do Domo de Lages, porção centro-sul do Estado de Santa Catarina, e sua relação com as diferentes unidades estratigráficas da Bacia do Paraná que ocorrem na região. Os lineamentos estruturais foram interpretados a partir da análise digital de imagens de satélite e de mapas de relevo sombreado, com o uso de técnicas de geoprocessamento. Os resultados mostram lineamentos estruturais com orientações NW, NNE, NE, ENE e E-W. Os lineamentos maiores (4-50 km) foram interpretados a partir dos mapas de relevo sombreado, enquanto os menores (1-3 km) foram interpretados a partir da imagem de satélite. De acordo com os dados de campo, estes linea mentos afetam rochas vulcânicas da Formação Serra Geral da Bacia do Paraná e rochas alcalinas associadas ao domo. Em todas estas direções estruturais são encontradas evidências de falhas transcorrentes. A formação das falhas transcorrentes destrais NNE tem sido relacionada a uma tensão compressiva orientada NE-SW. Considera-se que a idade máxima de geração dessas orientações estruturais situa-se no limite do Cretáceo Superior ao Paleógeno. A formação dessas estruturas tem sido relacionada à reativação de estruturas mais antigas presentes na bacia e no seu embasamento.
Revista Brasileira de GeociênciasABSTRACT Mesozoic-Cenozoic transcurrent tectonics in the Lages Dome, Santa Catarina. This work presents the multiscale study of structural lineaments that affect alkaline rocks associated to the Lages Dome, situated in the Eastern edge of the Paraná Basin, Santa Catarina state, Brazil. We analyzed satellite images (Landsat-TM) and Shuttle Radar Topography Mission (SRTM) project and carried out structural studies of alkaline rocks in quarries of the dome. The results show correlation between the lineaments extracted from the images and faults analyzed in quarries, especially around the NS directions (NNE to NNW) and EW (ENE to ESE) and, secondarily, NE and NW. These structures are largely related to reactivation of basement discontinuities. The first two directions correspond to dextral and sinistral transcurrent faults, respectively. Formation of these structures is compatible with a field of tension with axis oriented NE-SW, whose age ranges from the Late Cretaceous and Tertiary.
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