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    Metallogeny and its link to orogenic style during the Nuna supercontinent cycle

    Access Status
    Fulltext not available
    Authors
    Pehrsson, S.
    Eglington, B.
    Evans, D.
    Huston, D.
    Reddy, Steven
    Date
    2016
    Type
    Book Chapter
    
    Metadata
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    Citation
    Pehrsson, S. and Eglington, B. and Evans, D. and Huston, D. and Reddy, S. 2016. Metallogeny and its link to orogenic style during the Nuna supercontinent cycle. In Geological Society Special Publication, 83-94.
    Source Title
    Geological Society Special Publication
    DOI
    10.1144/SP424.5
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/71512
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 The Geological Society of London. The link between observed episodicity in ore deposit formation and preservation and the supercontinent cycle is well established, but this general framework has not, however, been able to explain a lack of deposits associated with some accretionary orogens during specific periods of Earth history. Here we show that there are intriguing correlations between styles of orogenesis and specific mineral deposit types, in the context of the Nuna supercontinent cycle. Using animated global reconstructions of Nuna's assembly and initial breakup, and integrating extensive databases of mineral deposits, stratigraphy, geochronology and palaeomagnetism we are able to assess spatial patterns of deposit formation and preservation. We find that lode gold, volcanic-hosted-massive-sulphide and nickel-copper deposits peak during closure of Nuna's interior ocean but decline during subsequent peripheral orogenesis, suggesting that accretionary style is also important. Deposits such as intrusion-related gold, carbonate-hosted lead-zinc and unconformity uranium deposits are associated with the post-assembly, peripheral orogenic phase. These observations imply that the use of plate reconstructions to assess orogenic style, although challenging for the Precambrian, can be a powerful tool for mineral exploration targeting. Supplementary material including (1) tables (S1-S3) of Euler poles and palaeopoles used, summary of Nuna orogens; (2) a figure (S1) of modelled plate velocities; (3) mp4 files (S1 & S2) of the model with age data; ore deposits and VGPs; and (4) a zip file (S1) of the Gplates model is available at <a href="http://www.geolsoc.org.uk/SUP18822">http://www.geolsoc.org.uk/SUP18822</a>.

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