English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

O Complexo Campos Gerais e um fragmento da crosta sialica Arqueana, situado no extremo sudoestedo Craton do Sao Francisco. Com base em criterios de campo e petrografia, foi possivel subdividirseus componentes ortognaissicos em dois grupos. O Ortognaisse Campos Gerais possui como principalcaracteristica sua estrutura migmatitica e composicao tonalitica a monzogranitica. O Ortognaisse Serrado Quilombo caracteriza-se pelo seu bandamento composicional irregular herdado da deformacao deuma suite de rochas tonaliticas e graniticas. As parageneses metamorficas observadas, com presenca deortopiroxenio metamorfico reliquiar, indicam que o primeiro evento metamorfico da regiao atingiu a faciesgranulito, durante o Arqueano, sendo responsavel pela sua migmatizacao. Os ortognaisses sao intrudidospor corpos circunscritos de metatonalitos e pelos leucogranitos Corrego do Sapateiro e Itapixe. Todas asunidades litodemicas sofreram metamorfismo em facies xisto-verde durante o Neoproterozoico. Os elementosmetamorficos e estruturais presentes no conjunto sugerem que a regiao funcionou como antepais durante aorogenia paleoproterozoica, e foi afetada por zonas de cisalhamento sinistrogiras durante o Neoproterozoico,relacionadas ao evento Brasiliano. Palavras-chave: Arqueano; TTG; Craton do Sao Francisco. ABSTRACT: The Campos Gerais Complex is a fragment of typical Archean continental crust, located in the southwestborder of the Sao Francisco Craton. Based on field and petrographic criteria, the ortogneiss unit was separatedin two: the Campos Gerais Orthogneiss has migmatitic structure and compositional range from tonalite tomonzo-granite, with presence of relict orthopyroxene; and the Serra do Quilombo Orthogneiss, caracterizedby compositional banding, developed from the deformation of cross-cutting tonalitic to granitic rocks. Thepresence of orthopyroxene indicates that the first metamorphic event ocurred in granulite facies during theNeoarchean, and was responsible for the migmatization of the Campos Gerais orthogneisses. The migmatiticorthogneisses were intruded by homogeneous metatonalitic bodies and by the Corrego do Sapateiro adItapixe leucogranites. All rock units suffered Neoproterozoic upper greenschist facies metamorphism. Themetamorphic and structural features suggest that the region worked as the foreland zone to the Paleoproterozoicorogeny, and was transected by sinistral Neoproterozoic mylonite zones related to the Brasiliano event.

GEOLOGIA DO COMPLEXO CAMPOS GERAIS AO SUL DE ALPINÓPOLIS, SUDOESTE DE MINAS GERAIS