Zircon Geochronology and Petrology of Alkaline-Potassic Syenites, Southwestern Serrinha Nucleus, East São Francisco Craton, Brazil

Abundant syenitic magmatism occurred on the São Francisco Cráton (Bahia State, Brazil) during the Paleoproterozoic period. Two syenitic stocks (Serra do Pintado and Morro das Agulhas-Bananas) from the eastern part of the craton have been dated at 2098 ± 2 Ma (U-Pb) and 2086 ± 17 to 2067 ± 22 Ma (Pb-Pb evaporation), respectively, suggesting that these are contemporaneous intrusions correlated with a post-Transamazonian episode of magmatism. In …