Campo Belo Metamorphic Complex: Tectonic evolution of an Archean sialic crust of the southern Sao Francisco Craton in Minas Gerais (Brazil)

Systematic geological studies performed in the study area allowed the chara cterization of six lithodemic units: three gneissic, one amphibolitic, one supracrustal and one fissure mafic. The mineral assemblage and the structur al record of these lithodemic units indicate that the study area was affect ed by five tectonothermal events. The structural pattern of the first and o ldest event occurred under granulite facies conditions and reveals essentia lly a sinistral kinematic pattern. The second event, showing dominant exten sional characteristics, is related to the generation of an ensialic basin f illed by the volcano-sedimentary sequence of the supracrustal lithodemic un it, The third event, which is the most expressive in the study region, is c haracterized by a vigorous regional migmatization process and by the genera tion of the Claudio Shear Zone, presenting dextral kinematic movement. The fourth event is represented by a fissure mafic magmatism (probably two diff erent mafic dike swarms) and finally, the fifth event is a regional metamor phic re-equilibration that reached the greenschist facies, closing the main processes of the tectonic evolution of the Campo Belo Metamorphic Complex.