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

Anais da Academia Brasileira de Ciências

Arildo H. Oliveira¹  MaurÍcio A. Carneiro¹ 

[1] ,Universidade Federal de Ouro Preto Escola de Minas Departamento de Geologia

关键词: Craton;    Archean;    tectonic evolution;    lithodemic units;    metamorphic complex;    Cráton;    Arqueano;    evolução tectônica;    unidades litodêmicas;    Complexo Metamórfico;   

DOI  :  10.1590/S0001-37652001000300009

来源: SciELO

【 摘 要 】

Systematic geological studies performed in the study area allowed the characterization of six lithodemic units: three gneissic, one amphibolitic, one supracrustal and one fissure mafic. The mineral assemblage and the structural record of these lithodemic units indicate that the study area was affected by five tectonothermal events. The structural pattern of the first and oldest event occurred under granulite facies conditions and reveals essentially a sinistral kinematic pattern. The second event, showing dominant extensional characteristics, is related to the generation of an ensialic basin filled by the volcano-sedimentary sequence of the supracrustal lithodemic unit. The third event, which is the most expressive in the study region, is characterized by a vigorous regional migmatization process and by the generation of the Claudio Shear Zone, presenting dextral kinematic movement. The fourth event is represented by a fissure mafic magmatism (probably two different mafic dike swarms) and finally, the fifth event is a regional metamorphic re-equilibration that reached the greenschist facies, closing the main processes of the tectonic evolution of the Campo Belo Metamorphic Complex.

【 授权许可】

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