Nonsulfide and sulfide-rich zinc mineralization of the Vazante Group, Minas Gerais: isotopic geochemistry and implications form regional exploration - Monteiro, Lena Virgínia Soares; Bettencourt, Jorge Silva; Juliani, Caetano; Bello, Rosa Maria da Silveira; DE Oliveira, Tolentino Flavio (Congresso Brasileiro de Geologia, 2004)