Mapeamento geológico-estrutural de uma porção da unidade independência do complexo Ceará localizada no município de Santa Quitéria-CE

Abstract

The present report address a geological mapping made in 1:25.000 scale in the municipality of Santa Quitéria, west to Itatiaia Uranium Deposit, mid-northern region of the State of Ceará. Executed during the period of April 24 to May 06 of 2017, the geological survey extended for an area of 64 km in a non regular polygon format. The referred mapping has as principal objective to interpret, comprehend and define the region’s tectonic environment and geological evolution. The mapped region belongs to the domain Ceará Central, located at the northern region of Borborema province and is inserted in Subunity Itatira (SUI), that belongs in the Independence of Ceará Complex unit. In the mapped area, the SUI is composed by shales, metatexts, quartzites, amphibolites, marbles, calcissilictic rocks and granites. The lithological assemblies found are from Neoproterozoic age formed from metamorphic paraderivate rocks in amphibolite facies during the Brasiliano cycle. It is interpreted that when this cycle began, the region was integrated by a QPC sequence (quartzites, pellets and carbonates) of a continental platform. In the Brasiliano orogeny, this sequence was metamorphosed and deformed until acquired the actual characteristics. The tecnonism of this cycle originated foliations with low angle folds with N and S direction and the bending axis with an E and W direction. The post brasiliano ruptile deformation is represented in the region by fractures and veins of diverse composition with preferential orientation to N and S.