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

    A new geochronological framework for mineralization and alteration in the Selwyn-Mount Dore Corridor, Eastern Fold Belt, Mount Isa Inlier, Australia: Genetic implications for iron oxide copper-gold deposits

    Access Status
    Fulltext not available
    Authors
    Duncan, R.
    Stein, H
    Evans, Katy
    Hitzman, M.
    Nelson, E.
    Kirwin, D.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Duncan, Robert J. and Stein, Holly J. and Evans, Katy A. and Hitzman, Murray W. and Nelson, Eric P. and Kirwin, Doug J. 2011. A new geochronological framework for mineralization and alteration in the Selwyn-Mount Dore Corridor, Eastern Fold Belt, Mount Isa Inlier, Australia: Genetic implications for iron oxide copper-gold deposits. Economic Geology. 106 (2): pp. 169-192.
    Source Title
    Economic Geology
    DOI
    10.2113/econgeo.106.2.169
    ISSN
    03610128
    School
    WASM - Western Australian School of Mines
    Remarks

    Copyright © 2011 Society of Economic Geologists. This article is published in the Economic Geology journal. Society of Economic Geologists, 7811 Shaffer Parkway, Littleton, CO 80127, USA (http://www.segweb.org)

    URI
    http://hdl.handle.net/20.500.11937/15012
    Collection
    • Curtin Research Publications
    Abstract

    New Re-Os in molybdenite and U-Pb in titanite and zircon age data have been used to discern several dis- crete alteration, mineralization, and igneous events that occurred in iron oxide-copper-gold (IOCG) deposits in the Selwyn-Mount Dore corridor of the Proterozoic Mount Isa inlier. Two distinct sodic-calcic alteration events that occurred prior to mineralization have been recognized. This suggests that sodic-calcic alteration may be a fundamental precursor to IOCG mineralization as it mobilizes large amounts of metals, including Fe, K, and Cu. Sodic-calcic alteration at Starra was early synmetamorphic (Isan orogeny) at 1594 ± 8 Ma. Some ironstone-hosted mineralization at Starra may have formed during this event, but an Re-Os molybdenite age of 1568 ± 7 Ma suggests that mineralization also occurred during a (late) metamorphic tectonic event. These ages demonstrate that the Starra system is unrelated to igneous activity; a metamorphic fluid source is pro- posed. Titanite from a preore alteration assemblage at Mount Elliott yields a U-Pb age of 1530 ± 11 Ma which is within error of the ~1515 Ma Re-Os molybdenite ages from both Mount Elliott and the adjacent SWAN de- posit. A magmatic-related origin for the Mount Elliott and SWAN deposits is favored given that the titanite and main-stage molybdenite ages are similar to the emplacement ages for the nearby Squirrel Hills Granite. Molyb- denite-bearing calcite veins that crosscut main-stage IOCG mineralization at SWAN have been dated at ~1355 Ma, indicating that this paragenetic stage is unrelated to the Squirrel Hills Granite. U-Pb SHRIMP zircon analyses of volumetrically minor trachyandesitic dikes from Mount Elliott and SWAN reveal relatively young crystallization ages of 1119 ± 15 and 1096 ± 10 Ma, therefore they are not a suitable fluid or metal source for these deposits.Two Re-Os molybdenite analyses from Mount Dore (1503 ± 5 and 1508 ± 5 Ma) are similar to the ~1515 Ma ages from Mount Elliott and SWAN emplacement age of and the Mount Dore Granite. How- ever, two other Re-Os dates (1497 ± 6 and 1501 ± 5 Ma) demonstrate that parts of the Mount Dore system may be slightly younger than Mount Elliott and SWAN. This younger timing is consistent with relative timing criteria that demonstrate mineralization postdates the crystallization of the Mount Dore Granite. Molybdenite from Lady Ella gives an age of 1487 ± 5 Ma. Mineralization at Mount Dore and Lady Ella is probably related to a late-stage, evolved magmatic fluid that generated more potassic alteration. The revised geochronological framework for alteration and mineralization in the Cloncurry district partially explains the fundamental differ- ences in geologic characteristics between IOCG deposits in the district and clearly demonstrates that not all of the IOCG occurrences are related to the intrusion of the voluminous Williams-Naraku batholith. Instead metal-rich reservoirs were generated under the Mount Isa inlier by subduction along the southern margin of the North Australia craton; these reservoirs have been periodically tapped during tectonothermal events, in- cluding metamorphism during the Isan orogeny and hot spot activity that generated extensive A-type magma- tism that have contributed to the significant metal enrichment across the Mount Isa inlier.

    Related items

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

    • Timing and Duration of High-Temperature Gold Mineralization and Spatially Associated Granitoid Magmatism at Chalice, Yilgarn Craton, Western Australia
      Bucci, L.; McNaughton, Neal; Fletcher, Ian; Groves, D.; Kositcin, N.; Stein, H.; Hagemann, S. (2004)
      The Chalice gold deposit, in the Eastern Goldfields province, Yilgarn Craton, Western Australia, is located in a middle to upper amphibolite facies metamorphic domain and is hosted by a mafic-ultramafic rock sequence that ...
    • The unique Katugin rare-metal deposit (southern Siberia): Constraints on age and genesis
      Gladkochub, D.; Donskaya, T.; Sklyarov, E.; Kotov, A.; Vladykin, N.; Pisarevskiy, Sergei; Larin, A.; Salnikova, E.; Saveleva, V.; Sharygin, V.; Starikova, A.; Tolmacheva, E.; Velikoslavinsky, S.; Mazukabzov, A.; Bazarova, E.; Kovach, V.; Zagornaya, N.; Alymova, N.; Khromova, E. (2017)
      © 2017 Elsevier B.V. We report new geological, mineralogical, geochemical and geochronological data about the Katugin Ta-Nb-Y-Zr (REE) deposit, which is located in the Kalar Ridge of Eastern Siberia (the southern part of ...
    • Opening the magmatic-hydrothermal window: high-precision U-Pb geochronology of the mesoproterozoic Olympic Dam Cu-U-Au-Ag deposit, South Australia
      Courtney-Davies, Liam ; Ciobanu, Cristiana; Tapster, Simon; Cook, Nigel; Ehrig, Kathy; Crowley, James; Verdugo-Ihl, Max; Wade, Benjamin; Condon, Daniel (2020)
      Establishing timescales for iron oxide copper-gold (IOCG) deposit formation and the temporal relationships between ores and the magmatic rocks from which hydrothermal, metal-rich fluids are sourced is often dependent on ...
    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.