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

    Cretaceous age, composition, and microstructure of pseudotachylyte in the Otago Schist, New Zealand

    145433_24278_Barker_pseudotachylyte_low.pdf (1.385Mb)
    Access Status
    Open access
    Authors
    Barker, S.
    Sibson, R.
    Palin, J.
    FitzGerald, J.
    Reddy, Steven
    Warr, L.
    van der Pluijm, B.
    Date
    2010
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Barker, Shaun and Sibson, Richard and Palin, J. Michael and FitzGerald, John and Reddy, Steven and Warr, Laurence and van der Pluijm, Ben. 2010. Cretaceous age, composition, and microstructure of pseudotachylyte in the Otago Schist, New Zealand. New Zealand Journal of Geology and Geophysics. 53 (1): pp. 15-29.
    Source Title
    New Zealand Journal of Geology and Geophysics
    DOI
    10.1080/00288301003631764
    ISSN
    00288306
    School
    Department of Applied Geology
    Remarks

    Copyright 2010 The Royal Society of New Zealand

    URI
    http://hdl.handle.net/20.500.11937/46765
    Collection
    • Curtin Research Publications
    Abstract

    At Tucker Hill, in Central Otago, New Zealand, a series of pseudotachylyte veins are hosted in quartzofeldspathic schist. Chilled margins, microlites, flow banding, and the crystallisation of mineral phases absent from the host rock provide unequivocal evidence for melting during pseudotachylyte formation. Whole rock analyses of pseudotachylyte reveal c. 3 enrichment of K2O, Ba, and Rb, and similar depletion of Na2O, CaO, Sr, and Eu, as compared to host schist. Formation age of pseudotachylyte is 95.9±1.8 Ma as measured by total fusion 40Ar/39Ar analyses. Stepwise heating of pseudotachylyte matrix yields an excellently defined 40Ar/39Ar plateau age of 96.0±0.3 Ma. These well-defined ages are attributed to the presence of potassium feldspar, low abundance of inherited lithic material from the host rock, and few fluid inclusions containing extraneous Ar. We propose that formation of these pseudotachylyte veins was related to Cretaceous extensional uplift and exhumation of the Otago Schist.

    Related items

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

    • New P–T and U–Pb constraints on Alpine Schist metamorphism in south Westland, New Zealand
      Scott, J.; Auer, A.; Muhling, J.; Czertowicz, T.; Cooper, A.; Billia, M.; Kennedy, Allen (2015)
      Metamorphic mineral compositions of a staurolite-bearing greyschist from the middle reaches of the Moeraki River valley in south Westland reveal peak equilibration at c. 558 ± 50 °C and c. 6.1 ± 1.2 kbar. Two c. 83 Ma ...
    • Sequestration of Zn into mixed pyrite-zinc sulfide framboids: A key to Zn cycling in the ocean?
      Hu, S.; Evans, Katy; Rempel, Kirsten; Guagliardo, P.; Kilburn, M.; Craw, D.; Grice, Kliti; Dick, J. (2018)
      Zinc (Zn) is an important micronutrient in the ocean, and fixation of Zn into organic, trace element-rich sediments is an important contributor to Zn cycling in the ocean. Framboidal sulfides are considered to be the major ...
    • Associations between sulfides, carbonaceous material, gold and other trace elements in polyframboids: Implications for the source of orogenic gold deposits, Otago Schist, New Zealand
      Hu, Si-Yu; Evans, Katy; Fisher, L.; Rempel, Kirsten; Craw, D.; Evans, Noreen; Cumberland, S.; Robert, Aileen; Grice, Kliti (2016)
      Intimately intergrown micron-scale framboidal pyrite, carbonaceous material (CM), chalcopyrite, sphalerite and cobaltite form polyframboids in prehnite-pumpellyite facies rocks of the Otago Schist, New Zealand. This study ...
    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.