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The Parnaíba Basin, like other Brazilian Paleozoic intracratonic basins, contains intrusive igneous bodies in its sedimentary section in the form of dykes and, mainly, thick sills. The identification of the geometry and the emplacement mechanism are important for the determination of the traps controlling gas and/or oil accumulations. A variety of models available in the literature suggests a complex relationship between the magma and the host rock. Several factors, such as the density and pressure of the magma injection, steam generation, regional and local stress fields, and the rheology of the host rock, work together controlling emplacement, expansion and...

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