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    The Pan-African Kekem gabbro-norite (West-Cameroon), U-Pb zircon age, geochemistry and Sr-Nd isotopes: Geodynamical implication for the evolution of the Central African fold belt

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    Authors
    Kwekam, M.
    Affaton, P.
    Bruguier, O.
    Liégeois, J.P.
    Hartmann, G.
    Njongfang, E.
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    Discipline
    Earth and related Environmental sciences
    Subject
    Geodynamics and mineral resources
    Audience
    Scientific
    Date
    2013
    Publisher
    Elsevier
    Metadata
    Show full item record
    Description
    The Kekem shoshonitic gabbro-norite association is part of the high-K calc-alkaline (HKCA) post-collisional magmatism, a major feature of the Pan-African Belt in Cameroon. LA-ICP-MS U Pb zircon analyses provide an age of 576 ± 4 Ma for the Kekem complex. This age is interpreted as dating the emplacement of the massif during the waning stage of the Pan-African orogeny. The latter is related to dextral movements along the Central Cameroon Shear Zone (CCSZ). The REE patterns display enriched LREE (LaN/YbN = 14.2 23.5) while HREE present a nearly flat profile (DyN/YbN = 1.3 1.7), and the La/Sm and Sm/Yb ratios led to propose that the Kekem gabbro-norites have been derived from the partial melting of a garnet-spinel lherzolite mantle source. The negative Nb Ta and Ti anomalies and the positive Pb anomalies indicate that this mantle source was modified by contribution of a subduction-related material. The low Ce/Pb (2.6 10.4) and Th/Yb ratios associated to high Ba/La ratios, indicate that source enrichment could be related to slab derived fluids. As a whole, the Kekem geochemical features suggest that primary gabbro-noritic magmas derived from a subduction-modified mantle source (metasomatised lithospheric mantle). Moderately high 86Sr/87Sr initial ratios (0.7068 0.7082), low eNd ( 5 to 9) and old Nd TDM model ages (1.6 1.8 Ga) are interpreted to result from contamination of Neoproterozoic mantle by the Paleoproterozoic crust. The ca. 576 Ma movements along the CCSZ are related to a Neoproterozoic metacratonization of the northern margin of the Congo craton during the Pan-African orogeny. This metacratonization led to vertical planar lithospheric delamination along lithospheric transcurrent faults, asthenospheric uprise and partial melting of the Paleoproterozoic lithospheric mantle.
    Citation
    Kwekam, M.; Affaton, P.; Bruguier, O.; Liégeois, J.P.; Hartmann, G.; Njongfang, E. (2013). The Pan-African Kekem gabbro-norite (West-Cameroon), U-Pb zircon age, geochemistry and Sr-Nd isotopes: Geodynamical implication for the evolution of the Central African fold belt. , Journal of African Earth Sciences, Vol. 84, 70-88, Elsevier, DOI: http://dx.doi.org/10.1016/j.jafrearsci.2013.03.010.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/1951
    doi: http://dx.doi.org/10.1016/j.jafrearsci.2013.03.010
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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