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    Contrasting copper and chromium metallogenic evolution of terranes in the Palaeoproterozoic Itabuna-Salvador-Curaca orogen, Sao Francisco craton, Brazil: new zircon (SHRIMP) and Sm-Nd (model) ages and their significance for orogen-parallel escape tectonics

    Access Status
    Fulltext not available
    Authors
    Oliveira, E.
    Windley, B.
    McNaughton, Neal
    Pimental, M.
    Fletcher, Ian
    Date
    2004
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Oliveira, Elson and Windley, Brian and McNaughton, Neal and Pimental, Marcio and Fletcher, Ian. 2004. Contrasting copper and chromium metallogenic evolution of terranes in the Palaeoproterozoic Itabuna-Salvador-Curaca orogen, Sao Francisco craton, Brazil: new zircon (SHRIMP) and Sm-Nd (model) ages and their significance for orogen-parallel escape tectonics. Precambrian Research. 128 (1-2): pp. 143-165.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2003.09.018
    ISSN
    03019268
    Faculty
    John De Laeter Centre For Mass Spectrometry (JdL
    Faculty of Science and Engineering
    School
    John de Laeter Centre for Mass Spectrometry (COE)
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/503357/description#description. Copyright © 2004 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/33996
    Collection
    • Curtin Research Publications
    Abstract

    The northern segment of the Palaeoproterozoic Itabuna-Salvador-Cura collisional orogen in the Sao Francisco craton (Brazil) comprises two high-grade terranes separated by the 150 km long, N-S-trending Itiba Syenite. The Cura terrane to the west contains copper sulphide deposits hosted by hypersthenite-norite complexes (e.g. Caraiba body), whereas the Jacurici terrane to the east contains chromite deposits hosted by peridotite-norite sills (e.g. Medrado body). SHRIMP U-Pb dating of zircons, combined with a significant major element compositional gap indicates that the Caraiba (2580±10 Ma) and the Medrado (2085±5 Ma) mafic-ultramafic complexes are not related by fractional crystallisation as previously thought. Depleted-mantle Nd model ages for the regional gneisses are also distinct, with the Cura terrane having younger ages (2.4-2.8 Ga) than the Jacurici terrane (2.9-3.2 Ga), suggesting that they represent two independent fragments of continental crust accreted during the Palaeoproterozoic orogeny. Emplacements of the Itiba Syenite (ca. 2084 Ma) and of the Medrado complex were apparently coeval, probably controlled by orogen-parallel block displacement, or escape tectonics, following continent-continent collision.

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