Petrogenesis of coexisting SiO - undersaturated to SiO - oversaturated felsic igneous rocks: the alkaline complex of Itatiaia, southeastern Brazil - Brotzu, Pietro; Gomes, Celso B.; Melluso, Leone; Morbidelli, Lucio; Morra, Vincenzo; Ruberti, Excelso (Lithos, 1997)