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    Differentiated Neogene bauxitization of volcanic rocks (western Cameroon): morpho-geological constraints on chemical erosion

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    Journal Article (1.393Mb)
    Date
    2020-11
    Author
    Momo, M.N.
    Beauvais, A.
    Tematio, P.
    Yemefack, M.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Lateritic weathering of Miocene volcanic rocks from western Cameroon highlands formed duricrusted bauxitic profiles. Two weathering profiles on ca. 14 Ma basalt and ca. 16 Ma trachyte were studied using geochemical mass balance functions. Less mobile elements Ti and Zr were used as references to quantify volumetric change (strain, ε), element transfer rate (τ) and geochemical mass transfers during the bauxitization process of basalt and trachyte. Conversion of parent rocks to kaolinite and goethite rich saprolites evolved to Al-Fe rich bauxites, mostly composed of gibbsite and iron oxy-hydroxides (goethite and hematite). However, formation of Al-Fe bauxitic profiles required higher Si leaching on trachyte than on basalt. Our results document that chemical weathering of a larger thickness of trachyte than basalt has been required to form a unit meter of weathering profile, implying differential rates of rock chemical erosion and topographic decay of landscapes. Rates of chemical erosion and formation of lateritic weathering profiles in western Cameroon have been mostly controlled by drainage conditions and volcanic rocks composition (mostly SiO2 content differences), that also resulted in contrasted landscapes evolution during the Neogene.
    https://dx.doi.org/10.1016/j.catena.2020.104685
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7648
    IITA Authors ORCID
    Martin YEMEFACKhttps://orcid.org/0000-0002-6709-8503
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1016/j.catena.2020.104685
    IITA Subjects
    Climate Change; Meteorology and Climatology
    Agrovoc Terms
    Weathering; Volcanic Eroptions; Erosion; Cameroon
    Regions
    Africa; Central Africa
    Countries
    Cameroon
    Hubs
    Central Africa Hub
    Journals
    Catena
    Collections
    • Journal and Journal Articles4835
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