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Tectonics, gold structural control and lithostratigraphy of Ferkessédougou metasedimentary basin, northern Côte d’Ivoire.
  • Yaya Zana OUATTARA,
Institut National Polytechnique Félix HOUPHOUET-BOIGNY ( INP-HB)
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Institut National Polytechnique Félix Houphouët-Boigny

Corresponding Author:gbele.ouattara@yahoo.fr

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The study area is located in the Ferkessédougou belt in northern Côte d’Ivoire, precisely 30 km east of the city of Ferkessédougou. The aim of this study is to understand the tectonic which control gold mineralization. A combination of remote analysis and field mapping work, trenching, reverse circulation drilling hole, core drilling hole was carried out and finally laboratory work (microscopy). Different processing such as ACP, adaptive filters have been applied to Landsat 8 and Radarsat satellite images, in order to enhance information for better lineament extraction. Also, different complementary techniques (horizontal gradient, Euler deconvolution) were applied to the areomagnetic map in order to highlight the different lineaments.
Four sets of lineaments have been producted by these images: N080-N100, N030-050, N000-N020, N120-N135.The validation of these different linear structures was made with field data. Thus, in the field, the metasediments show a strong S1 schistosity, stirikes NNE, with and dips towards the South-East, compatible with a D1 shortening episode. The emplacement of leucogranitic batholith and tonalite induces deformation (D2) which is shearing foliation S2. ). Later, diorite dykes induces the S3 shearing foliation. The earliest form of gold mineralization is located in quartz veins and fractures filled by sulphide ( pyrite). The second form of gold mineralization is disseminated and hosted in the sheared contacts betwween intrusive units with the metasediments. Studies show that quartz veins control the highest gold grades in tonalite unit. The mineralization of our study area is an IRGS type.
Keywords: Gold, mineralization, Pyrite, Ferkessedougou, Ivory Coast.