Carbonatites from Southeastern Brazil: geochemistry, O-C, Sr-Nd-Pb isotopes and relationships with the magmatism from the Paraná-Angola-Namibia province - Comin-Chiaramonti, P.; Gomes, Celso B.; Marques, Leila Soares; Censi, Paolo; Ruberti, Excelso; Antonini, Paolo (Mesozoic to cenozoic alkaline magnetism in the brazilian plataform, 2005)