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    A Synthetic Haematite Reference Material for LA‐ICP‐MS U‐Pb Geochronology and Application to Iron Oxide‐Cu‐Au Systems

    Access Status
    Fulltext not available
    Authors
    Courtney-Davies, Liam
    Gilbert, Sarah
    Ciobanu, Cristiana
    Tapster, Simon
    Richardson, Marcus
    Cook, Nigel
    Wade, Bnejamin
    Verdugo-Ihl, Max
    Ehrig, Kathy
    Condon, Daniel
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Courtney-Davies, L. and Gilbert, S. and Ciobanu, C. and Tapster, S. and Richardson, M. and Cook, N. and Wade, B. et al. 2020. A Synthetic Haematite Reference Material for LA‐ICP‐MS U‐Pb Geochronology and Application to Iron Oxide‐Cu‐Au Systems. Geostandards and Geoanalytical Research.
    Source Title
    Geostandards and Geoanalytical Research
    DOI
    10.1111/ggr.12365
    ISSN
    1639-4488
    Faculty
    Faculty of Science and Engineering
    School
    John de Laeter Centre (JdLC)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/IH130200033
    URI
    http://hdl.handle.net/20.500.11937/81954
    Collection
    • Curtin Research Publications
    Abstract

    In both nature and synthetic experiments, the common iron oxide haematite (α‐Fe2O3) can incorporate significant amounts of U into its crystal structure and retain radiogenic Pb over geological time. Haematite is a ubiquitous component of many ore deposit types and, therefore, represents a valuable hydrothermal mineral geochronometer, allowing direct constraints to be placed on the timing of ore formation and upgrading. However, to date, no suitable natural haematite reference material has been identified. Here, a synthetic haematite U‐Pb reference material (MR‐HFO) is characterised using LA‐ICP‐MS and ID‐TIMS. Centimetre‐scale ‘chips’ of synthesised α‐Fe2O3 were randomly microsampled via laser ablation‐extraction and analysed using ID‐TIMS. Reproducible U/Pb and Pb/Pb measurements were obtained across four separate chips (n = 13). Subsequently, an evaluation of the suitability MR‐HFO in constraining U‐Pb data via LA‐ICP‐MS is presented using a selection of natural samples ranging from Cenozoic to Proterozoic in age. The MR‐HFO normalised U‐Pb ratios are more concordant and ages more accurate versus the same LA‐ICP‐MS spot analyses normalised to zircon reference material, when compared with independently acquired ID‐TIMS data from the same natural haematite grains. Results establish MR‐HFO as a suitable reference material for LA‐ICP‐MS haematite U‐Pb geochronology.

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