1. This thesis examines the Rio Apa Block in southwest Mato Grosso do Sul, Brazil, and presents new geological, geochemical, and geochronological data.
2. The block consists of Paleoproterozoic crust that was formed during the evolution of the supercontinent Columbia, comprising segments of the Amoguijá Magmatic Arc constructed between 1.88-1.71 Ga along the southern margin of the Amazon Craton.
3. The thesis establishes a revised tectono-stratigraphic framework for the Rio Apa Block based on the analysis of its lithological units and structural evolution during multiple accretionary orogenic events between 2.07-1