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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/5263

Title: Geochemical modelling of the tonalitic and trondhjemitic granulites from the Itabuna-Salvador-Curaçá Block, Bahia, Brazil
Other Titles: Journal of South American Earth Sciences
Authors: Pinho, Ivana Conceição de Araújo
Barbosa, Johildo Salomão Figueirêdo
Leal, Angela Beatriz de Menezes
Martin, Hervé
Peucat, Jean-Jacques
Keywords: High temperature metamorphism;Geochemical modelling;Paleoproterozoic granulites;São Francisco craton;Bahia;Brazil
Issue Date: 2011
Abstract: The studied tonalitic and trondhjemitic granulites are located in the SSE granulitic domain of the São Francisco craton, Bahia, Brazil, where they represent most of the southern part of the Archean and Paleoproterozoic Itabuna-Salvador-Curaçá Block (ISCB). Chemically, the tonalitic and trondhjemitic granulites belong to a low-K calc-alkaline suite; their REE patterns are steep with strong LREE/HREE fractionation and no significant Eu anomaly. Garnet-bearing mafic granulites that occur as enclaves in the tonalitic and trondhjemitic granulites were derived from basalts and/or gabbros of tholeiitic affinity. Geochemical modelling showed that the tonalitic and trondhjemitic granulites were produced by moderate fractional crystallization of an assemblage of hornblende and plagioclase, with subordinate amounts of magnetite, apatite, allanite and zircon. The garnet-bearing mafic granulites would be the source of the magmas that generated these rocks. Partial melting left a residue made up of plagioclase, garnet, orthopyroxene and hornblende.
Description: p.312-323
URI: http://www.repositorio.ufba.br/ri/handle/ri/5263
ISSN: 0895-9811
Appears in Collections:Artigos Publicados em Periódicos (IGEO)

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