Geochemical modelling of the tonalitic and trondhjemitic granulites from the Itabuna-Salvador-Curaçá Block,Bahia, Brazil |
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| Authors: | Ivana Conceição de Araújo Pinho Johildo Salomão Figueiredo Barbosa Angela Beatriz de Menezes Leal Hervé Martin Jean-Jacques Peucat |
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| Institution: | 1. Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australian Resources Research Centre, PO Box 1130, Bentley, WA 6102 Australia;2. Centre for Exploration Targeting (CET), Department of Earth and Environmental Science, The University of Western Australia, M006, 35 Stirling Highway, Crawley, WA 6009, Australia;3. U.S. Geological Survey, Central Mineral and Environmental Resources Science Center, MS 973 Denver Federal Center, Denver, CO 80225, USA;4. Commonwealth Scientific and Industrial Research Organisation (CSIRO), Energy Technology, PO Box 52, North Ryde, NSW 1670, Australia;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Siberian Research Institute of Geology, Geophysics and Mineral Resources, Krasnyi pr. 67, Novosibirsk, 630091, Russia;3. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia;4. Geological Institute, Kola Research Center of the Russian Academy of Sciences, ul. Fersmana 14, Apatity, 184209, Russia |
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| 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. |
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