Mesozoic acid volcanics from southern Angola: petrology, Sr-Nd isotope characteristics and correlation with the acid stratoid volcanic suites of the Paranà basin (south-eastern Brazil)
Alberti, Antonio; Piccirillo, Enzo Michele; Bellieni, Giuliano; Civetta, Lucia; Comin-Chiaramonti, Piero; Morais, Eduardo A.A.
European Journal of Mineralogy Volume 4 Number 3 (1992), p. 597 - 604
published: Jun 11, 1992
manuscript accepted: Oct 18, 1991
manuscript received: Mar 19, 1991
ArtNo. ESP147050403018, Price: 29.00 €
Abstract The Angolan Mesozoic volcanic suites are concentrated along the continental margin and are characterized by voluminous sheet-like acid rock-types overlying stratoid tholeiitic basalts. The acid volcanics closely correspond in terms of stratigraphy, petrology and Sr-Nd isotope compositions to those of Lower Cretaceous age (135 ± 3 Ma) in the northern Parana basin (SE-Brazil). The Mesozoic tholeiitic volcanic suites of Angola (and Namibia), which crop out close to the continental margin represent the easterly extension of the vast volcanic activity of the Parana basin which occurred before the opening of the S. Atlantic ocean