info:eu-repo/semantics/article
ORIGEM E EVOLUÇÃO DAS ROCHAS METAVULCÂNICAS E METAPLUTÔNICAS DA REGIÃO DE ARENÓPOLIS (GO)
ORIGEM E EVOLUÇÃO DAS ROCHAS METAVULCÂNICAS E METAPLUTÔNICAS DA REGIÃO DE ARENÓPOLIS (GO)
Autor
PIMENTEL, MÁRCIO MARTINS
FUCK, REINHARDT ADOLFO
Institución
Resumen
The lithological and geochemical eharacteristics of metavolcanic and associated metaplutonic rocks cf the Arenópolis volcano-sedimentary sequence, in southwestern Goiás. Brazil, suggest an origin in a tectonic setting similar to modern volcanic arcs in a subduction zone environment. The mafic rocks are geochemically similar to the low-K tholeiites, typical to the early stages of development of recent island arcs, and the intermediate to felsic metavolcanic and metapyroclastic rocks are cale-alkaline. A multi-arc model is proposed for the geotectonic evolution of the Upper Proterozoic terranes that include the volcano-sedimentary sequence, in southwestern Goiás. Resumo indisponível.