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    The nature and timing of Palaeoproterozoic sedimentation at the southeastern margin of the Congo Craton; zircon U-Pb geochronology of plutonic, volcanic and clastic units in northern Zambia

    Access Status
    Fulltext not available
    Authors
    De Waele, Bert
    Fitzsimons, Ian
    Date
    2007
    Type
    Journal Article
    
    Metadata
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    Citation
    De Waele, Bert and Fitzsimons, Ian. 2007. The nature and timing of Palaeoproterozoic sedimentation at the southeastern margin of the Congo Craton; zircon U-Pb geochronology of plutonic, volcanic and clastic units in northern Zambia. Precambrian Research. 159 (1-2): pp. 95-116.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2007.06.004
    ISSN
    03019268
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    The Western Australian School of Mines
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/503357/description#description

    Copyright © 2007 Elsevier Ltd. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/40657
    Collection
    • Curtin Research Publications
    Abstract

    This study is focused on the determination of the age and provenance of Proterozoic (meta-)sedimentary units on the southern margin of the Congo Craton, collectively known as the Muva Supergroup. Zircon U–Pb SHRIMP dating of crystalline basement units (granite and volcanic tuffs) that form the basement to the Muva Supergroup have yielded crystallisation ages of between 1868 ± 7 and 1860 ± 13 Ma. Discrete volcaniclastic units within the deformed portions of the Muva Supergroup in the Irumide Belt have yielded crystallisation ages of between 1879 ± 13 and 1856 ± 4 Ma. Detrital zircon studies in three samples of quartzite and one conglomerate from the various components of the Muva Supergroup, the Mporokoso Group on the Bangweulu Block and the Kanona and Manshya River groups in the Irumide Orogen on the southeastern margin of the Bangweulu Block, have yielded populations of Archaean and Palaeoproterozoic zircons in which the youngest detrital grains have an age of ca. 1800 Ma. These data indicate that the Muva Supergroup is a Palaeoproterozoic succession deposited at ca. 1800 Ma and that the Mporokoso, Kanona and Manshya River groups are all temporally equivalent and are likely parts of a single widespread succession. In contrast, the youngest detrital zircon in the Kasama Formation, a discrete succession of mature fluvial quartzite on the Bangweulu Block, has yielded an age of 1434 ± 14 Ma, indicating that it is a younger Mesoproterozoic succession. A striking similarity between the detrital zircon populations in the Kasama Formation and those in the Mporokoso Group support previous sedimentological interpretations that it is a second-cycle sediment derived from the Mporokoso Group.

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