Abstract
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.
Highlights
The vast region of the Doce and Jequitinhonha river basins, located between the São Francisco craton and the eastern continental margin of Brazil, is encompassed by the northern and central sectors of the Neoproterozoic Mantiqueira structural province (Almeida and Hasui 1984)
Based on discussion of the results of a structural analysis performed at micro, meso and macro scales, we suggest a model for the tectonic evolution of the southern Araçuaí belt during the Brasiliano event
The Dom Silvério Group comprises an approximately 10 km wide belt that extends in a NNE direction for about 150 km in eastern Minas Gerais (Fig. 3)
Summary
The vast region of the Doce and Jequitinhonha river basins, located between the São Francisco craton and the eastern continental margin of Brazil, is encompassed by the northern and central sectors of the Neoproterozoic Mantiqueira structural province (Almeida and Hasui 1984). The main lithological units of the southern Araçuaí belt are (Fig. 4): the Dom Silvério Group, the Mantiqueira Complex, the Pedra Dourada Charnockite, and the Borrachudos Granitoid. The mineral parageneses of the metapelitic rocks of the Dom Silvério Group are the most important data sources regarding the main synkinematic metamorphism of the southern Araçuaí belt.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
