Predominant volcano-plutonic (mafic-felsic) activity is expressed in the eastern Banfora Belt (BB). Geochemical signature shows different geodynamic settings: i) mafic rocks are tholeiitic, sub-alkaline and show high-Mg tendency, whereas pyroxenolite (MgO ∼ 15.4 wt%) has komatiite affinity; ii) felsic volcanic rocks are sub-alkaline; iii) granitoids surrounding the BB are alkaline to calc-alkaline, high K, peraluminous to metaluminous. Geochemistry of mafic volcanic rocks shows an unusual an evolution from Middle Oceanic Ridge Basalt (MORB) to Arc-related. The Western Granite (WG) and Eastern Granites (EGs) emplaced by fractional crystallization and partial melting respectively, but sourced from igneous protolith (I-type magma) in volcanic arc setting (VAG). The Sodingue granite emplaced by fractional crystallization from A-type magma in “within plate setting”. Two-micas S-type granites located at the central portion of the belt and relate to syn-collisional fractional crystallization. The paper highlights the complexity of magma process throughout a diversity of sources, geochemical pattern and tectonic setting. An emphasis on the komatiite affinity of mafic magma is a challenge for related commodities, such as copper and gold resources.
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