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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/2516

Title: Idade Pb-Pb E Aspectos Petrológicos Da Mineralização Em Sodalita Azul Do Maciço Nefelina-Sienítico Itarantim, Sul Do Estado Da Bahia
Other Titles: Revista Brasileira de Geociências
Authors: Rosa, Maria De Lourdes Da Silva
Conceição, Herbet
Macambira, Moacir José Buenano
Marinho, Moacyr Moura
Cunha, Mônica Prisgsheim Da
Menezes, Rita Cunha Leal
???metadata.dc.contributor.advisor???: blue sodalite
Keywords: Pb-Pb age;Idade Pb-Pb;Itarantim Nepheline-Syenitic Massif;Maciço Nefelina-Sienítico Itarantim;sodalita azul
Issue Date: 2004
Abstract: Pb-Pb AGE AND PETROOLOGICAL ASPECTS OF THE BLUE SODALITE MINERALIZATION OF THE ITARANTIM NEPHELINE-SYENITE MASSIF, SOUTHERN STATE OF BAHIA The Itarantim nepheline-syenite massif (220 km2) is a late proterozoic intrusion (727±30 Ma; Rb-Sr) of the southern region of the State of Bahia. It is mostly constituted by nepheline-bearing syenites, with biotite or aegirine, and by alkaline dykes. The dykes are more abundant in the biotite-nepheline-syenites and are the most evolved rocks of the massif. Recently, a blue sodalite-syenite dyke has been identified in the southwest part of the massif, hosted by biotite-nepheline syenites. The blue syenites have been exploited as dimension stone. The dyke has magmatic sodalite that crystallized between 720 ± 9 Ma and 732 ± 24 Ma (Pb-PbZr), and cuts the magmatic foliation of the host syenite, imprinting a metasomatism with sodalite formation. Petrographic data indicate that the magmatic sodalite formed during the late stages by a volatile rich magma (500–600o C). The high contents (ppm) of Zr (>5,000), Hf (141), Ta (169), U (74) and F (1200) of the blue syenite suggest that it represents a highly evolved product from differentiation of the nepheline-syenitic magma.
Description: p. 347-354
URI: http://www.repositorio.ufba.br/ri/handle/ri/2516
ISSN: 2177-4382
Appears in Collections:Artigos Publicados em Periódicos (IGEO)

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