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    Emplacement age and thermal footprint of the diamondiferous Ellendale E9 lamproite pipe, Western Australia

    Access Status
    Fulltext not available
    Authors
    Evans, Noreen
    McInnes, Brent
    McDonald, Bradley
    Danisik, M.
    Jourdan, Fred
    Mayers, C.
    Thern, Eric
    Corbett, D.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Evans, Noreen J. and McInnes, Brent I.A. and McDonald, Bradley and Danisik, Martin and Jourdan, Fred and Mayers, Celia and Thern, Eric and Corbett, Dudley. 2013. Emplacement age and thermal footprint of the diamondiferous Ellendale E9 lamproite pipe, Western Australia. Mineralium Deposita. 48 (3): pp. 413-421.
    Source Title
    Mineralium Deposita
    DOI
    10.1007/s00126-012-0430-7
    ISSN
    00264598
    URI
    http://hdl.handle.net/20.500.11937/8361
    Collection
    • Curtin Research Publications
    Abstract

    The diamondiferous Ellendale 9 (E9) pipe is a funnel-shaped maar-diatreme volcano consisting of inward-dipping tuff sequences intruded by lamproite plugs and dykes. The host rocks for the E9 pipe are Permian sandstones. The multiple lithological contacts exposed within the mined maar volcano provide a natural laboratory in which to study the effect of volcanic processes on U–Th–Pb–He systematics. Zircon from the regional sandstone and E9 lamproite display a bimodal distribution of ages on (U–Th)/He–U/Pb plots. The zircon U/Pb ages for the E9 pipe (n = 52) range from 440 to 2,725 Ma, while the cluster of (U–Th)/He ages for the lamproite dyke zircon indicate that dyke emplacement occurred at 20.6 ± 2.8 Ma, concordant with a maximum emplacement age of about ≤22 Ma from phlogopite 40Ar/39Ar. These ages indicate a xenocrystic origin for the zircon entrained in the E9 dyke. The U/Pb ages of detrital zircon from the regional sandstone host (373–3,248 Ma; n = 41) are indistinguishable from those of the lamproite zircon xenocrysts, whereas the detrital zircon in the host sandstone yield (U–Th)/He ages from 260 to 1,500 Ma. A thermochronology traverse across the E9 lamproite dyke reveals that the zircon (U–Th)/He ages in the host sandstone have not been significantly thermally reset during dyke emplacement, even at the contact. The capability of the zircon (U–Th)/He method to distinguish deep, mantle source lithologies from upper crustal source lithologies could be used in geochemical exploration for diamonds. Pre-screening of detrital samples using etching and helium assay methods will improve the efficiency and decrease the cost of greenfields exploration.

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