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Mapping tectonic structures of Kédougou-Kénieba Inlier (Eastern Senegal) from satellite (LANDSAT-7 ETM+ / SRTM) and airborne geophysics imagerie

Abstract : The lineaments of the Kédougou-Kéniéba Inlier (KKI) were mapped from the processing of severalty pesofimages :(i) various coloured combinations Red-Green-Blue of 1 to 7 bands and the panchromatic band (8) of a set of images of the matic mapping (Thematic Mapper) of Landsat-7 satellite (ETM7+) ;(ii) SRTM image (Shuttle Radar Topography Mission) or DTM (Digital Terrain Model) of the Endeavour space shuttle; (iii)as well as the aero magnetic image of the study area. Five groups of NS,NNE-SSW, NE-SW, EW and NW-SE lineament directions were identified from these images. The NNE-SSW and NE-SW oriented lineaments are the most frequent. The NS oriented lineaments often correspond to a straightening of those oriented NNE-SSW. The EW and NW-SE oriented lineaments are rarely observed andthey often intersect with previous ones. Field structural data indicate that most of these lineaments correspond to shear and/or thrust faults,orto dykes. The NE-SW oriented lineaments would be the oldest. They are generally relative to reverse shear zones and trust faults whichare associated with the D1 Eoeburnean phase of deformation. NS and NNE-SSW oriented lineaments correspond to faults and shear zones, mainly sinistral, associated with NW-SE oriented lineaments. These three sets of lineamentsforma conjugated systemfault, associated with the sinistral transpression phase of the D2 Eburnean deformation phase. The occurrence of all these structures would berelated to the Eoeburnean, Eburnean and post-Eburnean orogenicevents. Indeed, the doleritic dykes, which have been dated between 1600 Ma and 1100 Ma, show ductile deformation which testify a post-Eburnean tectonicevent (Kibarian or Hercynian?) subsequently affecting the Paleoproterozoic for mations of the KKI.
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https://hal-insu.archives-ouvertes.fr/insu-02024854
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, February 19, 2019 - 1:48:40 PM
Last modification on : Friday, April 5, 2019 - 8:18:08 PM

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  • HAL Id : insu-02024854, version 1

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Moussa Dabo, Tahar Aïfa, Emmanuel Tama Samoura, Ibrahima Gassama, Ibrahima Guingne, et al.. Mapping tectonic structures of Kédougou-Kénieba Inlier (Eastern Senegal) from satellite (LANDSAT-7 ETM+ / SRTM) and airborne geophysics imagerie. 3rd IGCP 638 International Conference, Oct 2018, Abidjan, Côte d’Ivoire. pp.17-18. ⟨insu-02024854⟩

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