Abstract
Middle Precambrian rocks of the southern Serra do Espinhaço were examined with respect to facies, petrography, tectonics and metamorphism. An Archaean basement (Pre-Minas Supergroup) consists of an older granitic unit and a younger unit composed of schists (type: greenstone belt). An unconformity separates basement rocks from the Proterozoic Espinhaço Supergroup (approx. 2500-1600 Ma). On the eastern margin of the São Francisco Craton there has developed a NS-trending shelf-sea with shallow-water deposits (sands, conglomerates, pelites) and ferruginous and iron-rich sediments. The Espinhaço orogeny (approx. 2000-1300 Ma) caused west vergent fault and fold tectonics. Volcanic activity is mainly restricted to a late stage of orogeny. Regional dynamothermal metamorphism (?1400-1100 Ma) produced retrograde overprinting of the basement and progressive overprinting of the Espinhaço Supergroup. The Brazilian Cycle (approx. 700-450 Ma) caused moderate thermometamorphism and E-W compression.
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