Abstract
In the Pontalina region, Goiás, many metamafic bodies presenting various sizes are associated to gneiss and metasedimentary rocks occur within the Goiás Magmatic Arc. Geochemical data shows that the metamafic rocks are of magmatic origin, present alkaline to sub alkaline compositions and tholeiitic affinities. The signatures in relation to the incompatible elements may be compared to that of the enriched mid ocean ridge basalt (E-MORB) or to that of island arc basalt (IAB). Isotopic studies indicate Neoproterozoic ages with TDM between 1.0 and 1.2 Ga and possibly they are related to oceanic crust subduction and formation of island arcs.
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