Petrological, geochemical and Sr-Nd isotopic features of alkaline rocks from the Arraial do Cabo Frio peninsula (southeastern Brazil) (2002)
- Authors:
- USP affiliated authors: GOMES, CELSO DE BARROS - IGC ; RUBERTI, EXCELSO - IGC
- Unidade: IGC
- Subjects: GEOQUÍMICA; PETROLOGIA; ROCHAS ALCALINAS; MAGMATISMO
- Language: Inglês
- Abstract: The alkaline activity in the Cabo Frio region is made up mainly of intermediate and felsic differentiate rocks emplaced about 55 Ma ago into the crystalline basement as sills, plugs and dykes. Two magma suites can be distinguished: (a) a strongly silica-undersaturated tephriphonolite to phonolite serie; (b) a weakly silica-undersaturated to satured trachyandesite-trachyte series. Petrography, mineral chemistry, whole-rock chemistry trends and isotopic data strongly support a genetic link among the lithotypes of each suites consistent with fractional crystallization processes dominated by the observed phases. The same data, however appear to exclude a link between the two groups of rocks, supporting a petrogenesis by prolonged differentiation processes starting from two distinct parental magma with a slight difference in the Si02 saturation. The scarce basanites and trachybasalts reported in the same area could represent the most probable compositions for the parental magmas of the two suites. The initial 87Sr/86S r (0.70401- 0.70458) and I43Nd/I44Nd (0.51239-0.51247) isotopic ratios and the significant potassic component indicate derivation of these rocks from an enriched lithospheric mantle source.
- Imprenta:
- Source:
- Título do periódico: Periodico di Mineralogia
- ISSN: 0369-8963
- Volume/Número/Paginação/Ano: v. 71, n. 2, p. 137-158, 2002
-
ABNT
BENNIO, Lucia; GOMES, Celso B.; BROTZU, Pietro; et al. Petrological, geochemical and Sr-Nd isotopic features of alkaline rocks from the Arraial do Cabo Frio peninsula (southeastern Brazil). Periodico di Mineralogia, Roma, v. 71, n. 2, p. 137-158, 2002. Disponível em: < http://www.dst.uniroma1.it/riviste/permin/testi/V71/29.pdf >. -
APA
Bennio, L., Gomes, C. B., Brotzu, P., D'Antonio, M., Lustrino, M., Melluso, L., et al. (2002). Petrological, geochemical and Sr-Nd isotopic features of alkaline rocks from the Arraial do Cabo Frio peninsula (southeastern Brazil). Periodico di Mineralogia, 71( 2), 137-158. Recuperado de http://www.dst.uniroma1.it/riviste/permin/testi/V71/29.pdf -
NLM
Bennio L, Gomes CB, Brotzu P, D'Antonio M, Lustrino M, Melluso L, Morbidelli L, Ruberti E. Petrological, geochemical and Sr-Nd isotopic features of alkaline rocks from the Arraial do Cabo Frio peninsula (southeastern Brazil) [Internet]. Periodico di Mineralogia. 2002 ; 71( 2): 137-158.Available from: http://www.dst.uniroma1.it/riviste/permin/testi/V71/29.pdf -
Vancouver
Bennio L, Gomes CB, Brotzu P, D'Antonio M, Lustrino M, Melluso L, Morbidelli L, Ruberti E. Petrological, geochemical and Sr-Nd isotopic features of alkaline rocks from the Arraial do Cabo Frio peninsula (southeastern Brazil) [Internet]. Periodico di Mineralogia. 2002 ; 71( 2): 137-158.Available from: http://www.dst.uniroma1.it/riviste/permin/testi/V71/29.pdf - Petrologia do maciço alcalino de Itatiaia, RJ-MG-SP
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- Petrogenesis of coexisting SiO - undersaturated to SiO - oversaturated felsic igneous rocks: the alkaline complex of Itatiaia, southeastern Brazil
- Descrição das ocorrências I
- Associações petrográficas
- Investigação petrológica e geoquímica de rochas alcalinas
- Petrology of the tephrite-phonolite suite and cognate xenoliths of the Fortaleza district (Ceará, Brazil)
- Petrogenesis of the late cretaceous alkaline complex of Morro Sâo João (southeastern Brazil)
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