Contrasting Copper And Chromium Metallogenic Evolution Of Terranes In The Palaeoproterozoic Itabuna-salvador-curaçá Orogen, São Francisco Craton, Brazil: New Zircon (shrimp) And Sm-nd (model) Ages And Their Significance For Orogen-parallel Escape Tectonics

dc.creatorOliveira E.P.
dc.creatorWindley B.F.
dc.creatorMcNaughton N.J.
dc.creatorPimentel M.
dc.creatorFletcher I.R.
dc.date2004
dc.date2015-06-26T14:23:48Z
dc.date2015-11-26T14:12:10Z
dc.date2015-06-26T14:23:48Z
dc.date2015-11-26T14:12:10Z
dc.date.accessioned2018-03-28T21:12:45Z
dc.date.available2018-03-28T21:12:45Z
dc.identifier
dc.identifierPrecambrian Research. , v. 128, n. 1-2, p. 143 - 165, 2004.
dc.identifier3019268
dc.identifier10.1016/j.precamres.2003.09.018
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-1142297734&partnerID=40&md5=9f8846a861521c9fc578ae5162d63567
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/94256
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/94256
dc.identifier2-s2.0-1142297734
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1241921
dc.descriptionThe northern segment of the Palaeoproterozoic Itabuna-Salvador- Curaçá collisional orogen in the São Francisco craton (Brazil) comprises two high-grade terranes separated by the 150km long, N-S-trending Itiúba Syenite. The Curaçá terrane to the west contains copper sulphide deposits hosted by hypersthenite-norite complexes (e.g. Caraíba 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 Caraíba (2580±10Ma) and the Medrado (2085±5Ma) 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 Curaçá terrane having younger ages (2.4-2.8Ga) than the Jacurici terrane (2.9-3.2Ga), suggesting that they represent two independent fragments of continental crust accreted during the Palaeoproterozoic orogeny. Emplacements of the Itiúba Syenite (ca. 2084Ma) and of the Medrado complex were apparently coeval, probably controlled by orogen-parallel block displacement, or escape tectonics, following continent-continent collision. © 2003 Elsevier B.V. All rights reserved.
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dc.relationPrecambrian Research
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dc.titleContrasting Copper And Chromium Metallogenic Evolution Of Terranes In The Palaeoproterozoic Itabuna-salvador-curaçá Orogen, São Francisco Craton, Brazil: New Zircon (shrimp) And Sm-nd (model) Ages And Their Significance For Orogen-parallel Escape Tectonics
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