Compositional characteristics of fluid inclusions as exploration tool for Au-mineralization at Larafella, Burkina Faso |
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Authors: | R Klemd S Ott |
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Institution: | FB-Geowissenschaften, Universität Bremen. P.O. Box 330440, 28334, Bremen, Germany |
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Abstract: | The Larafella Au-prospect (Burkina Faso) lies within dacitic rocks of the Palaeoproterozoic Birimian greenstone belts. Gold mineralization is intimately associated with zones of cataclastic deformation. Whilst the lode-vein mineralization is closely associated with CO2-rich fluid inclusions, the barren quartz veins are characterized by H2O ± salt-bearing inclusions. Geochemical studies on the immediate wall-rock of the quartz veins have shown an increase of As in zones of gold enrichment, while alteration overprints such as carbonatization and chloritization cannot be correlated unequivocally with Au-mineralization. Consequently, fluid inclusion studies of quartz veins and As-anomalies constitute important exploration tools for mesothermal gold mineralization, since Au-rich zones can be distinguished from Au-depleted zones. |
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Keywords: | Au-mineralization CO2-inclusions hydrothermal alteration greenstone belt Burkino Faso |
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