Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    The recycling of chromitites in ophiolites from southwestern North America

    Access Status
    Fulltext not available
    Authors
    González-Jiménez, J.
    Camprubí, A.
    Colás, V.
    Griffin, W.
    Proenza, J.
    O'Reilly, S.
    Centeno-García, E.
    García-Casco, A.
    Belousova, E.
    Talavera, Cristina
    Farré-de-Pablo, J.
    Satsukawa, T.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    González-Jiménez, J. and Camprubí, A. and Colás, V. and Griffin, W. and Proenza, J. and O'Reilly, S. and Centeno-García, E. et al. 2017. The recycling of chromitites in ophiolites from southwestern North America. Lithos. 294-295: pp. 53-72.
    Source Title
    Lithos
    DOI
    10.1016/j.lithos.2017.09.020
    ISSN
    0024-4937
    School
    John de Laeter Centre
    URI
    http://hdl.handle.net/20.500.11937/58948
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier B.V. Podiform chromitites occur in mantle peridotites of the Late Triassic Puerto Nuevo Ophiolite, Baja California Sur State, Mexico. These are high-Cr chromitites [Cr# (Cr/Cr + Al atomic ratio = 0.61–0.69)] that contain a range of minor- and trace-elements and show whole-rock enrichment in IPGE (Os, Ir, Ru). That are similar to those of high-Cr ophiolitic chromitites crystallised from melts similar to high-Mg island-arc tholeiites (IAT) and boninites in supra-subduction-zone mantle wedges. Crystallisation of these chromitites from S-undersaturated melts is consistent with the presence of abundant inclusions of platinum-group minerals (PGM) such as laurite (RuS 2 )-erlichmanite (OsS 2 ), osmium and irarsite (IrAsS) in chromite, that yield T MA ˜ T RD model ages peaking at ~ 325 Ma. Thirty-three xenocrystic zircons recovered from mineral concentrates of these chromitites yield ages (2263 ± 44 Ma to 278 ± 4 Ma) and Hf-O compositions [? Hf (t) = - 18.7 to + 9.1 and 18 O values < 12.4‰] that broadly match those of zircons reported in nearby exposed crustal blocks of southwestern North America. We interpret these chromitite zircons as remnants of partly digested continental crust or continent-derived sediments on oceanic crust delivered into the mantle via subduction. They were captured by the parental melts of the chromitites when the latter formed in a supra-subduction zone mantle wedge polluted with crustal material. In addition, the Puerto Nuevo chromites have clinopyroxene lamellae with preferred crystallographic orientation, which we interpret as evidence that chromitites have experienced high-temperature and ultra high-pressure conditions ( < 12 GPa and ~ 1600 °C). We propose a tectonic scenario that involves the formation of chromitite in the supra-subduction zone mantle wedge underlying the Vizcaino intra-oceanic arc ca. 250 Ma ago, deep-mantle recycling, and subsequent diapiric exhumation in the intra-oceanic basin (the San Hipólito marginal sea) generated during an extensional stage of the Vizcaino intra-oceanic arc ca. 221 Ma ago. The T RD ages at ~ 325 Ma record a partial melting event in the mantle prior to the construction of the Vizcaino intra-oceanic arc, which is probably related to the Permian continental subduction, dated at ~ 311 Ma.

    Related items

    Showing items related by title, author, creator and subject.

    • Cold plumes trigger contamination of oceanic mantle wedges with continental crust-derived sediments: Evidence from chromitite zircon grains of eastern Cuban ophiolites
      Proenza, J.; González-Jiménez, J.; Garcia-Casco, A.; Belousova, E.; Griffin, W.; Talavera, Cristina; Rojas-Agramonte, Y.; Aiglsperger, T.; Navarro-Ciurana, D.; Pujol-Solà, N.; Gervilla, F.; O'Reilly, S.; Jacob, D. (2018)
      © 2018 China University of Geosciences (Beijing) and Peking University. The origin of zircon grains, and other exotic minerals of typical crustal origin, in mantle-hosted ophiolitic chromitites are hotly debated. We report ...
    • Early Eocene clinoenstatite boninite and boninite-series dikes of the ophiolite of New Caledonia; a witness of slab-derived enrichment of the mantle wedge in a nascent volcanic arc
      Cluzel, D.; Ulrich, M.; Jourdan, Fred; Meffre, S.; Paquette, J.; Audet, M.; Secchiari, A.; Maurizot, P. (2016)
      © 2016 Elsevier B.V.Clinoenstatite-bearing boninites (CE-boninite) from the serpentinite sole of the Cenozoic ophiolite of New Caledonia near Nepoui have been dated by the 40Ar/39Ar method, yielding two plateau ages of ...
    • Asthenosphere–lithosphere interaction triggered by a slab window during ridge subduction: Trace element and Sr–Nd–Hf–Os isotopic evidence from Late Carboniferous tholeiites in the western Junggar area (NW China)
      Tang, G.; Wyman, D.; Wang, Q.; Li, J.; Li, Zheng-Xiang; Zhao, Z.; Sun, W. (2012)
      Tholeiites occur in a variety of geological settings, e.g., mid-ocean ridge, back-arc basin, ocean island, island arc and intra-continent, and their geochemical and isotopic characteristics vary according to the corresponding ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.