Abstract
The lithological and geochemical eharacteristics of metavolcanic and associated metaplutonic rocks cf the Arenopolis volcano-sedimentary sequence, in southwestern Goias. 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 Goias.
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