Formação serra geral, noroeste de Santa Catarina: mapeamento e petrologia

Abstract

The present work presents a petrographic and petrological study of the volcanic rocks and the features of volcano-sedimentary interactions of the Serra Geral Formation in the region of Guaraciaba-SC (Paraná Basin). The objectives of this research were to promote the discussion about the evolution between the spills, to understand their genesis as well as the events that condition these volcanic rocks, the volcano-sedimentary records and the hydrovolcanic records present in the study area. The systematic of the study consisted of field activities, with obtaining samples of volcanic, volcano-sedimentary and hydrovolcanic rocks, as well as photographs and description of features of significant importance for the scope of the work. Through the mesoscopic, macroscopic and microscopic analysis it was possible to characterize the occurrence of the Cordilheira Alta and Campo Erê facies, which in general are characterized by the occurrence of basaltic rocks, with grayish coloration in fresh face, varying from aphanitic to fine phaneritic, as well as, the existence of numerous records of volcano-sedimentary interaction, in the same way it was possible to verify the occurrence of hydrovolcanic records, which condition numerous occurrences of alteration and hydrothermal mineralization. In this way the present study contributed to the petrographic and petrogenetic understanding of the rocks and features belonging to the Serra Geral Formation.