Sulfur, carbon, oxygen and strontium isotopic evidences for the genesis of the hydrothermal zinc non-sulfide and sulfide mineralizations in the vazante, Ambrósia and Fagundes deposits, MG, Brazil - Monteiro, Lena Virgínia Soares; Bettencourt, Jorge Silva; Bello, Rosa Maria da Silveira; Juliani, Caetano; Tassinari, Colombo Celso Gaeta; De Oliveira, Tolentino Flávio; Pérez-Aguilar, Annabel (South American Symposium on Isotope Geology, 2003)