Proterozoic thermochronologic implications from 40 Ar/ 39 Ar and K-Ar dating of the Campo Belo metamorphic complex, Southern São Francisco craton, Brazil - Teixeira, Wilson; Onstott, T. C.; Makenya, M.; Szabó, Gergely Andres Julio (Anais da Academia Brasileira de Ciências, 1997)