Petrology and Structural Characterization of Post-Neoproterozoic Dolerites from the Kimberlite Fields in the Kéniéba Region (Western Mali) — Oak Academic Publishing
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Petrology and Structural Characterization of Post-Neoproterozoic Dolerites from the Kimberlite Fields in the Kéniéba Region (Western Mali)
Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
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Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
,
Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
,
Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
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EUREKAGEO Sarl Consulting Mining Company, Bamako, Republic of Mali
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Unité de Formation et de Recherche des Sciences de la Terre et des Ressources Minières (UFR-STRM), University of Cocody, Abidjan, Côte d’Ivoire
1 Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
2 Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
3 Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
4 Laboratoire des Sciences Géographiques, du Génie Civil et des Géosciences, Institut National Polytechnique Félix HOUPHOUËT-BOIGNY (INP-HB), Yamoussoukro, Côte d’Ivoire
5 EUREKAGEO Sarl Consulting Mining Company, Bamako, Republic of Mali
6 Unité de Formation et de Recherche des Sciences de la Terre et des Ressources Minières (UFR-STRM), University of Cocody, Abidjan, Côte d’Ivoire
Post-Neoproterozoic dolerites from the Kéniéba region (Western Mali) are often associated with kimberlites. The rarity of kimberlite outcrops led to the study of doleritic rocks, spatially associated with them. The petrographic and lithogeochemical study showed that the dolerites of the Kéniéba kimberlitic fields are of tholeiitic nature and of the E-MORB (Enriched-Mid Ocean Ridge Basalt) type. This reflects an enrichment over time, compared to the Birimian dolerites of the volcano-sedimentary greenstone belt of Toumodi, in central C?te d’Ivoire. Furthermore, these dolerites are enriched in SiO 2 , TiO 2 , Zr and poor in Fe 2 O 3 , MgO. These dolerites would have formed in a late to post-orogenic intracontinental context during the breakup of Gondwana. Structurally, Kéniéba dolerites are often associated with kimberlite pipes, fractures and large deep structures identified using aeromagnetic images. Taking into account the fact that kimberlites do not outcrop in the Kéniéba region, the geochemical study coupled with the interpretation of aeromagnetic data proved to be very useful for the search for pipes.
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