Abstract
The central segment of the Neoproterozoic Ribeira belt in the studied area is composed of four tectonic units: the Occidental, Oriental, Paraiba do Sul and Embu terranes. The metasedimentary sequence of the Occidental Terrane represents the reworked margin of the Sao Francisco Craton. The Oriental Terrane comprises the cordilleran magmatic arc that collided with the Sao Francisco Plate at ca. 580 Ma. The Paraiba do Sul Terrane is composed of Paleoproterozoic orthogneisses and metasedimentary rocks, and the Embu Terrane comprises supracrustal succession and undated orthogneisses. Granitoid rocks intrude all terranes. These terranes were thrust-stacked during the main deformational phase related to the collisional stage of the Brasiliano Orogeny, when the Occidental Terrane was covered by the other ones. The nature and the paleogeography of the Paraiba do Sul and Embu terranes are unclear, but a relation to a magmatic arc environment can be suggested.
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