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    Ediacaran terrane accretion in the Arabian-Nubian Shield

    Access Status
    Fulltext not available
    Authors
    Cox, G.
    Jourdan, Fred
    Lewis, C.
    Collins, A.
    Halverson, G.
    Foden, J.
    Nettle, D.
    Kattan, F.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Cox, Grant M. and Lewis, Christopher J. and Collins, Alan S. and Halverson, Galen P. and Jourdan, Fred and Foden, John and Nettle, David and Kattan, Fayek. 2012. Ediacaran terrane accretion in the Arabian-Nubian Shield. Gondwana Research. 21 (2-3): pp. 341-352.
    Source Title
    Gondwana Research
    DOI
    10.1016/j.gr.2011.02.011
    ISSN
    1342-937X
    URI
    http://hdl.handle.net/20.500.11937/12321
    Collection
    • Curtin Research Publications
    Abstract

    The Ad Dawadimi Terrane is an Ediacaran basin of the Arabian Nubian Shield (ANS), Saudi Arabia. This basin terrane is situated in the far eastern part of the ANS and represents the youngest accretion event of the exposed ANS. Therefore, the timing of events within the basin is key to understanding both the closure of the Mozambique Ocean and the amalgamation of Gondwana along the northern East African Orogen. Here we present U/Pb detrital zircon data for the Abt Formation, the principle basin sediments of the Ad Dawadimi Terrane, along with 40Ar/39Ar ages on muscovite and whole rock Sm/Nd data. These data indicate that deepwater deposition in the Abt Basin did not end until after ca. 620 Ma and that deformation and greenschistfacies metamorphism of the Abt Formation occurred at 620±3 (2s) Ma along an active margin. This is the youngest terrane amalgamation event reported so far in the Arabian–Nubian Shield, but we suggest even younger sutures lie further east beneath the Phanerozoic cover of eastern Saudi Arabia. Our results suggest that the Ediacaran basins of the eastern ANS were not part of the Huqf basin in Oman, which was instead part of a passive margin of Neoproterozoic India, separated from the active margin of Africa by the Mozambique Ocean that probably did not close until the late Ediacaran or early Cambrian.

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