Produção Nacional
Arcabouço tectono-estratigráfico e evolução das Bacias Caiuá e Bauru no Sudeste brasileiro
2010; Sociedade Brasileira de Geologia; Volume: 40; Issue: 2 Linguagem: Inglês
10.25249/0375-7536.2010402265285
ISSN2177-4382
Autores Tópico(s)Fish biology, ecology, and behavior
ResumoWith the ending of the eocretaceous volcanic manifestations (133 Ma) the Southeastern portion of the South American Plate was submitted by a process of tectonics reorganization generating basins that had sheltered continental sedimentary sequences. The responsible tectonics events for the accumulation of these sequences can be divided in two main phases. The first phase is related to the eocretaceous thermal subsidence, that was widely in the regions where if they point out the biggest thicknesses of basalts of the Serra Geral Formation, in the middle-west of the Rio Grande do Sul State, the northwest of the Paraná State and west of the São Paulo State, responsible for the formation of the basins Jacuí and Caiuá. During the second phase, in which if it originated the Bauru Basin, had it the neocretaceous uplifting in the southwestern region of Minas Gerais State and South of Goiás State, resultants of the magmatic activities associates to the Trindade Mantle Plume. The analyses had shown that the Caiuá Basin (Eocretaceous) was characterized by a depression whose depocenter would be located in the southern portion toward to the state of the Paraná and whose limit north would extend until the Southeast of Minas Gerais State. At this time, the arid climate was certified for an aeolian sedimentation. The Bauru Basin, generated in the Neocretáceo, presents depocenter situated between the west of the São Paulo State and southwestern of the Minas Gerais, sheltering flat arid - semi arid lacustrine (playa-lakes) and alluvial deposits, with suggestive characteristics of more humid climatic conditions.
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