Rb-Sr and Sm-Nd geochronology of the Cana Brava leyred mafic-ultramafic intrusion, Brazil, and considerations regarding its tectonic evolution - Correia, Ciro Teixeira; Girardi, Vicente Antonio Vitorio; Tassinari, Colombo Celso Gaeta; Jost, Hardy (Revista Brasileira de Geociências, 1997)