Grupo Açungui, Proterozóico, estratigrafia, tectônica
Abstract
The stratigraphic order of the Açungui Group was significantly altered by thrust stacking of tectonic slices during basin closure. These slices presently show one or more regularly ordered internai lithological assemblages, which correspond to only a part of the original stratigraphic column. In Paraná, the Açungui Group is made up by the Capiru, Votuverava and Antinha Formations, each including three distinct lithologic assemblages, which are frequenüy limited by thrust faults. The Capiru Formation comprises the Juruqui, Rio Branco and Morro Grande assemblages; the Votuverava Formation comprises the Bromado, Coloninha and Saivá assemblages; and the Antinha Formation comprises the Tacaniça, Capivara and Vuturuvu assemblages. The spectrum of lithologic assemblages shows contrasting depositional environments, from very shallow carbonate platform to continental slope with turbidite deposits. Climatic conditions varied from hot and wet to glacial or subglacial.
