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 metamorphic sole of New Caledonia ophiolite: 40Ar/39Ar, U-Pb, and geochemical evidence for subduction inception at a spreading ridge

    189626_73340_Cluzel-Tectonics2012_New_Caledonia.pdf (1.246Mb)
    Access Status
    Open access
    Authors
    Cluzel, Dominique
    Jourdan, Fred
    Meffre, Sébastien
    Maurizot, Pierre
    Lesimple, Stéphane
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Cluzel, Dominique and Jourdan, Fred and Meffre, Sébastien and Maurizot, Pierre and Lesimple, Stéphane. 2012. The metamorphic sole of New Caledonia ophiolite: 40Ar/39Ar, U-Pb, and geochemical evidence for subduction inception at a spreading ridge. Tectonics. 31:TC3016.
    Source Title
    Tectonics
    DOI
    10.1029/2011TC003085
    ISSN
    0278-7407
    Remarks

    Copyright © 2012 American Geophysical Union.

    URI
    http://hdl.handle.net/20.500.11937/14199
    Collection
    • Curtin Research Publications
    Abstract

    Amphibolite lenses that locally crop out below the serpentinite sole at the base of the ophiolite of New Caledonia (termed Peridotite Nappe) recrystallized in the high-temperature amphibolite facies and thus sharply contrast with blueschists and eclogites of the Eocene metamorphic complex. Amphibolites mostly display the geochemical features of MORB with a slight Nb depletion and thus are similar to theyoungest (Late Paleocene–Eocene) BABB components of the allochthonous Poya Terrane. Thermochronological data from hornblende (40Ar/39Ar), zircon, and sphene (U-Pb) suggest that these mafic rocks recrystallized at ~56 Ma. Using various geothermobarometers provides a rough estimate of peak recrystallization conditions of ~0.5 GPa at ~80–95°C. The thermal gradient inferred from the metamorphic assemblage (~60°C km-1), geometrical relationships, and geochemical similarity suggest that these mafic rocks belong to the oceanic crust of the lower plate of the subduction/obduction system and recrystallized when they subducted below young and hot oceanic lithosphere. They were detached from the down-going plate and finally thrust onto unmetamorphosed Poya Terrane basalts. This and the occurrence of slab melts at ~53 Ma suggest that subduction inception occurred at or near to the spreading ridge of the South Loyalty Basin at ~56 Ma.

    Related items

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

    • Twenty-five million years of subduction-accretion-exhumation during the Late Cretaceous-Tertiary in the Northwestern Caribbean: The Trinidad dome, Escambray complex, Central Cuba
      Despaigne-Diaz, A.; Garcia-Casco, A.; Cáceres Govea, D.; Jourdan, Fred; Wilde, S.; Trujillo, G. (2016)
      The Trinidad dome, Escambray complex, Central Cuba, forms part of an accretionary wedge built-up during intra-oceanic subduction in the Caribbean from the Late Cretaceous (~75 Ma) to Tertiary. Fieldwork, microscopic ...
    • Sulfur isotope evolution in sulfide ores from Western Alps: Assessing the influence of subduction-related metamorphism
      Giacometti, F.; Evans, Katy; Rebay, G.; Cliff, J.; Tomkins, A.; Rossetti, P.; Vaggelli, G.; Adams, D. (2014)
      Sulfides entering subduction zones can play an important role in the release of sulfur and metals to the mantle wedge and contribute to the formation of volcanic arc-associated ores. Fractionation of stable sulfur isotopes ...
    • Geochronology of Paleoproterozoic Augen Gneisses in the Western Gneiss Region, Norway: Evidence for Sveconorwegian Zircon Neocrystallization and Caledonian Zircon Deformation
      Røhr, T.; Bingen, B.; Robinson, P.; Reddy, Steven (2013)
      The Western Gneiss Region, Western Norway, consists of Palaeoproterozoic crust of Baltica ancestry (Baltican Basement), partly subducted to high- and ultrahigh-pressure (HP-UHP) conditions during the Scandian Orogeny ...
    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.