Mapeamento geológico básico em escala de semi-detalhe a sul do município de Goiandira, Goiás.

Abstract

Basic geological surveys are essential in the initial identification and characterization of existing natural resources. The scale of work is one of the most important requirements to define when one intends to carry out this type of work. Taking into consideration that the greater the detail, the better the understanding. A 1:50,000 scale geological mapping was carried out in the southeast of the state of Goiás, between the towns of Goiandira and Cumari, in order to understand the relationship between the gneissic rocks found in the area. The mapping resulted in the identification of six lithostratigraphic units described as Metamorphic-Metaultramafic Complex, Metasedimentary Unit A, Metasedimentary Unit B, Gneissic Unit A, Migmatitic Unit and Gneissic Unit B. Making it possible to associate and allocate the above mentioned units in the Araxá Group and in the Association of Orthogneissic and Migmatitic Rocks. The mapping also resulted in the recognition of two distinct structural domains and in the identification of a strong low grade retrometamorphic event in the lower green schist facies characterized by the albitization and saussuritization of the quartz-feldspathic rocks and by the sericitization of the schists.