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LITOESTRATIGRAFIA RELAÇÕES ESTRATIGRÁFICAS E EVOLUÇÃO PALEOGEOGRÁFICA DOS GRUPOS CANASTRA E PARANOÁ (REGIÃO DE VAZANTE-LAGAMAR, MG)

1984; Sociedade Brasileira de Geologia; Volume: 14; Issue: 2 Linguagem: Inglês

10.25249/0375-7536.19848191

2177-4382

Mário da Costa Campos Neto,

Fish biology, ecology, and behavior

Thís paper attemps to define the terrigenous and carbonate facíes, lithostratigraphy and Middle Riphean paleogeographic evolution of the Paranoá Group. From west to east, three contemporaneous regressive zones can be recognized: the Paracatu Zone, with basal black schists, phyllites of the Western Facies and turbidites of the Eastern Facies; the Vazante Zone, a dolomitic barrier reef complex; and the State Zone on the continental platform, which contains patch reefs of the Lagamar Facies. These three zones were buried by the carbonate-pelitic psamitic sediments of the Cover Sequences. The líthostratígraphy of the Canastra Group is also defined showing the superpositíon of two deltaic cycles (the Lower Quartzitic Unit and the Middle Quartzitic Unit) overlain by sub-littoral to littoral deposits of the Upper Psamo-Pelitic Unit. During deposition of this sequence, an are evolued which separated the flyshoid basin of the Ibiá Formation to the west from the Cover Sequence to the east. The contemporaneous zones of the Paranoá Group are stratigraphically related to the Upper Psamo-Pelitic Unit of the Canastra Group.