Produção Nacional
Revisado por pares
The Rio Doce Orogeny, Southeastern Brazil
1995; Elsevier BV; Volume: 8; Issue: 2 Linguagem: Inglês
10.1016/0895-9811(95)00002-w
ISSN1873-0647
AutoresMário da Costa Campos Neto, M.C.H. Figueiredo,
Tópico(s)Geological formations and processes
ResumoThe Neoproterozoic-Eopaleozoic superposed orogenic system of Southeastern Brazil, which was active during the Brasiliano-Pan-African Cycle during the assembly of this sector of the Gondwana Supercontinent, includes distinct terranes such as the Guanhães, Curitiba, Apiaí-Guaxupé and Serra do Mar microplates and the Juiz de Fora Thrust Belt. These orogenic systems also affected the reworked border of the São Francisco Craton. The collisional or ocean plate subduction-controlled “Brasiliano I” Orogeny was responsible for the generation of fold belts along the southeastern border of the São Francisco Craton, the accretion of different microplates and the formation of a magmatic arc associated with the roots of a northwestward trending thrust belt. The “Brasiliano I” evolution occurred during the Neoproterozoic and by 600 Ma was already in a post-orogenic stage in the Apiaí-Guaxupé Microplate, with the intrusion of rapakivi-like granitoids. The Rio Doce Orogeny is best characterized in the Serra do Mar Microplate by a magmatic arc, active between 590 and 570 Ma, with batholithic calc-alkaline plutonism exhibiting subduction zone components and a chemical zonation indicative of northwestward subduction. The collisional stage (560–530 Ma) accounted for the accretion of the Serra do Mar Microplate to the former orogenic domains. Anatexis of mostly metasediments producing peraluminous migmatites and granites, began at the calc-alkaline magmatic arc stage and culminated during crustal thickening associated with the northwesterly piling-up of large thrust slices. The post-collisional plutonism (520–480 Ma) is characterized by plutons and dikes of mainly alkali-calcic granitoids enriched in incompatible elements. Os sistemas orogênicos superpostos Neoproterozóico-Eopaleozóicos do sudeste brasileiro, ativos durante o Ciclo Brasiliano-Pan-Africano com a amalgamação desse setor do Supercontinente Gondwana, incluem terrenos diferentes, como as microplacas Guanhães, Curitiba, Apiaí-Guaxupé e Serra do Mar e o Cinturão de Cavalgamento Juiz de Fora. Estes sistemas orogênicos também afetaram a borda retrabalhada do Cráton do São Francisco. A Orogênese “Brasiliana I”, do tipo colisional ou relacionada com subducção de crosta oceânica, gerou cinturões de dobramentos na borda sudeste do Cráton do São Francisco e a acresção de distintas microplacas, além de um arco magmático associado ás raízes de um cinturão de cavalgamento. A evolução do “Brasiliano I” ocorreu durante o Neoproterozóico e atingiu, há cerca de 600 Ma, um estágio pós-orogênico com a intrusão de granitóides do tipo rapakivi, na Microplaca Apiaí-Guaxupé. A Orogenêse Rio Doce é melhor caracterizada na Microplaca Serra do Mar através de um arco magmático, de 590 a 570 Ma, com
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