The tectonic interaction between subsequent basins in the external domain of the Araçuaí Orogen: a case study of Planalto de Minas Region, Minas Gerais
DOI:
https://doi.org/10.11606/issn.2316-9095.v17-397Keywords:
Rift Basins, Structural High of Planalto de Minas, Half-graben, Geophysics, Espinhaço Supergroup, Macaúbas Group.Abstract
In Minas Gerais state, the Southern Espinhaço Supergroup and Macaúbas Group are the major geotectonic expression of the crustal sucessives fragmentation cycles that shaped the São Francisco-Congo paleocontinent between the Statherian and Cryogenian periods. The geological mapping (1:25.000) in Planalto de Minas region (central-northern portion of Minas Gerais) revealed the occurrence of the São João da Chapada Formation (ca. 1.7 Ga, Espinhaço Supergroup) directly superimposed by a Tonian metavolcano-sedimentary sequence, here called Planalto de Minas Formation (Macaúbas Group), dated at ca. 889 Ma. The geological-geophysical data integration revealed that the Planalto de Minas region remained as a structural high, and this is a reflection of the complex structural arrangement of superimposed rifts, with the formation and interaction among one half-graben or branched system of half-grabens, being important for the tectonic-stratigraphy control — on architecture and evolution — of the Macaúbas basin.
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