Evidence of magmatic activity related to middle jurassic and lower cretaceous rifting from northeastern Brazil (Ceara-Mirim): k/'AR' age, palaeomagnetism, petrology and 'SR'-'ND' isotope characteristics - Bellieni, Giuliano; Macedo, M. H. F; Petrini, Riccardo; Piccirillo, Enzo Michele; Cavazzini, Giancarlo; Comin-Chiaramonti, P.; Ernesto, Márcia; Macedo, J. W. P.; Martins, G; Melfi, Adolpho José; Pacca, Igor Ivory Gil; De Min, Angelo (Chemical Geology, 1992)