U/PB SHRIMP geochronology of the augen gneisses from the Seridó belt (Borborema Province): geodynamic significance - Hollanda, Maria Helena Bezerra Maia de; Archanjo, Carlos José; Souza, Laécio Cunha de; Liu, Dunyi; Armstrong, Richard (Simpósio Nacional de Estudos Tectônicos, 2007)