Stable isotope study on margarite-corundum schists (matamorphosed high-sulfidation alteration zones) from the Serra do Itaberaba Group, Brazil - Pérez-Aguilar, Annabel; Juliani, Caetano; Monteiro, Lena Virgínia Soares; Fallick, Anthony (International Symposium on Applied Isotope Geochemistry, 2007)