Geochemical Mobility Associated to Gold and Base Metal Occurrences of Mangodara Sector, in Southern Burkina Faso, Banfora Greenstone Belts (West African Craton) — Oak Academic Publishing
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Geochemical Mobility Associated to Gold and Base Metal Occurrences of Mangodara Sector, in Southern Burkina Faso, Banfora Greenstone Belts (West African Craton)
Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
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Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
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Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
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Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
1 Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
2 Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
3 Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
4 Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Ouagadougou, Burkina Faso
In the Mangodara area within the Banfora greenstone belts (Baoulé-Mossi domain of the West African Craton), our study focused on geochemical assessment of the mobility of major and trace elements. Gold and base metal occurrences are hosted in highly metamorphic felsic (metarhyolite) and intermediate (metadacite and metaandesite) formations. Common mineral assemblages made up of staurolite - kyanite - pyrophyllite are interpreted to represent the metamorphosed equivalent of aluminous hydrothermal alteration. Associated felsic and intermediate volcanic rocks are enriched in Fe 2 O 3 , K 2 O (metaandesite, metarhyolite) and depleted in MgO, Al 2 O 3 , CaO, P 2 O 5 , Na 2 O (metarhyolite) and Fe 2 O 3 , MgO, CaO (metaandesite). Al 2 O 3 depletion in mineralized kyanite-staurotide bearing metarhyolites suggests corroded minerals. Mineralized metarhyolites show enrichment in Au, Ag, Ba, Bi, Cr, Cu, Eu, La, Mo, Ni, Pb, S, Sc, V and depletion in As Sb Co, Sn, Zn while mineralized metaandesites show enrichment in Au, Ag, As, Mo, S, Sb and depletion in Co, Sn, Zn, Bi, Cr, Cu, Eu, Ni, Pb, Sc. Ba, La, V are immobile in metaandesites. Finally, Ag, As, Sn appear as geochemical vectors for gold exploration in the study area since gold mineralization is characterized by Au + Ba + Cu + Eu + La + Mo + Ni + S association in metarhyolites and Au + S + Sb + As + Ag + Bi in metaandesites.
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