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    CO2 fluid inclusions in Jack Hills zircons

    Access Status
    Fulltext not available
    Authors
    Menneken, M.
    Geisler, T.
    Nemchin, Alexander
    Whitehouse, M.
    Wilde, S.
    Gasharova, B.
    Pidgeon, R.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Menneken, M. and Geisler, T. and Nemchin, A. and Whitehouse, M. and Wilde, S. and Gasharova, B. and Pidgeon, R. 2017. CO2 fluid inclusions in Jack Hills zircons. Contributions to Mineralogy and Petrology. 172 (8): Article ID 66.
    Source Title
    Contributions to Mineralogy and Petrology
    DOI
    10.1007/s00410-017-1382-9
    ISSN
    0010-7999
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/54739
    Collection
    • Curtin Research Publications
    Abstract

    The discovery of Hadean to Paleoarchean zircons in a metaconglomerate from Jack Hills, Western Australia, has catalyzed intensive study of these zircons and their mineral inclusions, as they represent unique geochemical archives that can be used to unravel the geological evolution of early Earth. Here, we report the occurrence and physical properties of previously undetected CO 2 inclusions that were identified in 3.36–3.47 Ga and 3.80–4.13 Ga zircon grains by confocal micro-Raman spectroscopy. Minimum P–T conditions of zircon formation were determined from the highest density of the inclusions, determined from the density-dependence of the Fermi diad splitting in the Raman spectrum and Ti-in-zircon thermometry. For both age periods, the CO 2 densities and Ti-in-zircon temperatures correspond to high-grade metamorphic conditions (=5 to =7 kbar/~670 to 770 °C) that are typical of mid-crustal regional metamorphism throughout Earth’s history. In addition, fully enclosed, highly disordered graphitic carbon inclusions were identified in two zircon grains from the older population that also contained CO 2 inclusions. Transmission electron microscopy on one of these inclusions revealed that carbon forms a thin amorphous film on the inclusion wall, whereas the rest of the volume was probably occupied by CO 2 prior to analysis. This indicates a close relationship between CO 2 and the reduced carbon inclusions and, in particular that the carbon precipitated from a CO 2 -rich fluid, which is inconsistent with the recently proposed biogenic origin of carbon inclusions found in Hadean zircons from Jack Hills.

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