The southern Araçuaí belt and the Dom Silvério Group: geologic architecture and tectonic significance

Anais da Academia Brasileira de Ciências

Guilherme G. Peres¹  Fernando F. Alkimim¹  Hanna Jordt-evangelista¹ 

[1] ,Universidade Federal de Ouro Preto Departamento de Geologia Ouro Preto MG ,Brasil

关键词: Araçuaí-West Congo orogen;    Araçuaí belt;    Dom Silvério Group;    Brasiliano event;    Orógeno Araçuaí-Congo Ocidental;    Faixa Araçuaí;    Grupo Dom Silvério;    Evento Brasiliano;   

DOI  :  10.1590/S0001-37652004000400011

来源: SciELO

【 摘 要 】

The Araçuaí belt corresponds to the external portion of the western half of the Araçuaí-West Congo Neopro-terozoic orogen. TheAraçuaí belt fringes the São Francisco craton to east and is separated from the crystalline core of the orogen by the Abre Campo geophysical discontinuity. The southern Araçuaí belt involves four major lithologic units: the Archean and Paleoproterozoic gneisses of the Mantiqueira Complex, the Pedra Dourada Charnockite, the Paleoproterozoic Borrachudos Granitoid, and the metavolcanosedimentary rocks of the Dom Silvério Group. The Dom Silvério Group occurs in a NNE-SSW striking belt and consists of a thick package of metapelitic rocks with intercalations of quartzites, amphibolites, meta-ultramafics, banded iron formations, gondites and marbles. All units of the southern Araçuaí belt underwent four syn-metamorphic phases of deformation in the course of the Brasiliano event. The first phase, synchronous to a regional amphibolite facies metamorphism, was associated to a general tectonic transport towards north along the left-lateral Dom Silvério shear zone and its low angle segment. The second and third phases represent progressive stages of a west directed shortening, which led to the development of local thrusts and pervasive folds in several scales. The fourth phase is extensional and reflects the collapse of the orogen.

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