Poços de Caldas alkaline complex (Minas Gerais- São Paulo states, Brazil): geochemistry and SR-ND isotope characteristics, a revies

Poços de Caldas alkaline complex (Minas Gerais- São Paulo states, Brazil): geochemistry and SR-ND isotope characteristics, a revies (2002)

Authors:
- Comin-Chiaramonti, P.
- Gomes, Celso B.
Autor USP: GOMES, CELSO DE BARROS - IGC
Unidade: IGC
Subjects: CRETÁCEO; GEOQUÍMICA ISOTÓPICA
Language: Inglês
Abstract: The Late Cretaceous Poços de Caldas alkaline massif intrudes the Proterozoic Socorro-Guaxupé Nappe, a structure dividing the Brasilia and Ribeira mobile belts. Detailed geochemical analyses show that the Poços de Caldas complex is composed by almost three main magmatic clans, i.e. prevailing phonolites- nepheline syenites, followed by subordinate ankaratrites - teprites and by lamprophyric dykes. The three clans have different characteristics, i.e. phonolites - nepheline syenites form a potassic and tendentially agpaitic suite, whereas ankaratrites - tephrites and lamprophyres are sodic and strongly potassic, respectively, with alkali index < 0.8. Incompatible elements, REE and Sr-Nd isotope results are also consistent with three indipentent magmatic suites, well distinct with respect to the Serra do Mar and Alto Paranaíba igneous provinces. In particular, the isotope' systematics suggest lithospheric mantle sources, variously metasomatized during Late Proterozoic times.
Imprenta:
- Publisher: Facoltà di Ingegneria
- Publisher place: Trieste
- Date published: 2002
Source:
- Título do periódico: Quaderni di mineralogia, petrografia e geochimica applicate
- Volume/Número/Paginação/Ano: v. 2, p. 50-65, 2002

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ABNT

COMIN-CHIARAMONTI, P.; GOMES, Celso B. Poços de Caldas alkaline complex (Minas Gerais- São Paulo states, Brazil): geochemistry and SR-ND isotope characteristics, a revies. Quaderni di mineralogia, petrografia e geochimica applicate[S.l: s.n.], 2002.
APA

Comin-Chiaramonti, P., & Gomes, C. B. (2002). Poços de Caldas alkaline complex (Minas Gerais- São Paulo states, Brazil): geochemistry and SR-ND isotope characteristics, a revies. Quaderni di mineralogia, petrografia e geochimica applicate. Trieste: Facoltà di Ingegneria.
NLM

Comin-Chiaramonti P, Gomes CB. Poços de Caldas alkaline complex (Minas Gerais- São Paulo states, Brazil): geochemistry and SR-ND isotope characteristics, a revies. Quaderni di mineralogia, petrografia e geochimica applicate. 2002 ; 2 50-65.
Vancouver

Comin-Chiaramonti P, Gomes CB. Poços de Caldas alkaline complex (Minas Gerais- São Paulo states, Brazil): geochemistry and SR-ND isotope characteristics, a revies. Quaderni di mineralogia, petrografia e geochimica applicate. 2002 ; 2 50-65.