TECTONOSTRATIGRAPHIC TERRANE ANALYSIS ON NEOPROTEROZOIC TIMES: THE CASE STUDY OF ARAXÁ SYNFORM, MINAS GERAIS STATE, BRAZIL: IMPLICATIONS TO THE FINAL COLLAGE OF THE GONDWANALAND.

Abstract

The Araxá Synform is a regional fold with gently WNW plunging. The outcrops of the Araxá, Ibiá and Canastra Groups occur at their limbs. The region is the type locality of these units. These Groups belong to the Brasilia Fold Belt, a Neoproterozoic tectonic unit evolved at the western margin of the São Francisco-Congo Craton. Geological mapping, structural analysis, whole rock geochemistry, mineral chemistry, petrography and geochronology are the main tools to understand the tectonic evolution of these geological units. In this paper we apply tectonostratigraphic terrane analysis to the solution of stratigraphic problems in the Brasília Belt and Gondwanaland collage.