Geochemistry of Magmatic Rocks of the Syama Belt, Southern Mali, West African Craton — Oak Academic Publishing
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Geochemistry of Magmatic Rocks of the Syama Belt, Southern Mali, West African Craton
Laboratoire de Cartographie, DER de Géologie, Faculté des Sciences et Techniques (FST), Université des Sciences, des Techniques et des Technologies de Bamako (USTTB), Bamako, Mali
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Laboratoire de Minéralogie et de Pétrologie, DER de Géologie, Faculté des Sciences et Techniques, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako, Mali
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Laboratoire de Cartographie, DER de Géologie, Faculté des Sciences et Techniques (FST), Université des Sciences, des Techniques et des Technologies de Bamako (USTTB), Bamako, Mali
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Laboratoire de Cartographie, DER de Géologie, Faculté des Sciences et Techniques (FST), Université des Sciences, des Techniques et des Technologies de Bamako (USTTB), Bamako, Mali
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Ecole Nationale d’Ingénieurs Abdramane Baba Touré (ENI-ABT), Bamako, Mali
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Université Paul Sabatier de Toulouse, Toulouse, France
1 Laboratoire de Cartographie, DER de Géologie, Faculté des Sciences et Techniques (FST), Université des Sciences, des Techniques et des Technologies de Bamako (USTTB), Bamako, Mali
2 Laboratoire de Minéralogie et de Pétrologie, DER de Géologie, Faculté des Sciences et Techniques, Université des Sciences, des Techniques et des Technologies de Bamako, Bamako, Mali
3 Laboratoire de Cartographie, DER de Géologie, Faculté des Sciences et Techniques (FST), Université des Sciences, des Techniques et des Technologies de Bamako (USTTB), Bamako, Mali
4 Laboratoire de Cartographie, DER de Géologie, Faculté des Sciences et Techniques (FST), Université des Sciences, des Techniques et des Technologies de Bamako (USTTB), Bamako, Mali
5 Ecole Nationale d’Ingénieurs Abdramane Baba Touré (ENI-ABT), Bamako, Mali
6 Université Paul Sabatier de Toulouse, Toulouse, France
Within southern Mali, the Syama belt constitutes a linear major structure-oriented N-S, which host several gold deposits (e.g., Syama and Tabakoroni) and prospect areas (e.g. Tellem). The Syama Belt is formed by magmatic rocks (basalts, lamprophyres, andesites, dacites and microgranites); sedimentary rocks (shales) and volcano-sedimentary rocks (pyroclastics). The magmatic rocks are divided into two main volcanic series: tholeiitic affinity rocks (basalts and lamprophyres) and calc-alkaline affinity (andesites) that are the most evolved. The field relationships between rocks of these two series suggest that the calc-alkaline series are younger the tholeiitic series. These tholeiitic series present the Mid-Ocean Ridge Basalt (MORB) affinity whereas the calc-alkaline series would be linked to an island arc-type. This coexistence is not an isolated case within the West African Craton (WAC). Otherwise, the Syama belt has all the characteristics of other belts, within which a number of gold deposits are developed, in the WAC.
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