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

Autor: Moussa Dabo, Tahar Aïfa, Emmanuel Tama Samoura, Ibrahima Gassama, Ibrahima Guingne, Papa Malick Ngom
Přispěvatelé: Université Cheikh Anta Diop [Dakar, Sénégal] (UCAD), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: 3rd IGCP 638 International Conference
3rd IGCP 638 International Conference, Oct 2018, Abidjan, Côte d’Ivoire. pp.17-18
HAL
Popis: International audience; The lineaments of the Kédougou-Kéniéba Inlier (KKI) were mapped from the processing ofseveralty pesofimages :(i) various coloured combinations Red-Green-Blue of 1 to 7 bands and thepanchromatic band (8) of a set of images of the matic mapping (Thematic Mapper) of Landsat-7satellite (ETM7+) ;(ii) SRTM image (Shuttle Radar Topography Mission) or DTM (Digital TerrainModel) 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 fromthese images. The NNE-SSW and NE-SW oriented lineaments are the most frequent. The NSoriented lineaments often correspond to a straightening of those oriented NNE-SSW. The EW andNW-SE oriented lineaments are rarely observed andthey often intersect with previous ones. Fieldstructural data indicate that most of these lineaments correspond to shear and/or thrust faults,ortodykes. The NE-SW oriented lineaments would be the oldest. They are generally relative to reverseshear zones and trust faults whichare associated with the D1 Eoeburnean phase of deformation. NSand NNE-SSW oriented lineaments correspond to faults and shear zones, mainly sinistral, associated with NW-SE oriented lineaments. These three sets of lineamentsforma conjugatedsystemfault, associated with the sinistral transpression phase of the D2 Eburnean deformationphase. The occurrence of all these structures would berelated to the Eoeburnean, Eburnean andpost-Eburnean orogenicevents. Indeed, the doleritic dykes, which have been dated between 1600Ma and 1100 Ma, show ductile deformation which testify a post-Eburnean tectonicevent (Kibarianor Hercynian?) subsequently affecting the Paleoproterozoic for mations of the KKI.
Databáze: OpenAIRE
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