%0 Conference Paper %F Oral %T Structural evolution of the Paleoproterozoic formations of the Kédougou-Kéniéba Inlier, Eastern Senegal %+ Université Cheikh Anta Diop [Dakar, Sénégal] (UCAD) %+ Géosciences Rennes (GR) %A Dabo, Moussa %A Aïfa, Tahar %A Samoura, Emmanuel Tama %A Gassama, Ibrahima %A Guingne, Ibrahima %A Ngom, Papa Malick %< avec comité de lecture %B 3rd IGCP 638 International Conference %C Abidjan, Côte d’Ivoire %S abstract volume %P 18 %8 2018-10-15 %D 2018 %K Eoeburnean %K Eburnean %K Birimian %K transpression %K transtension %K Kédougou-Kéniéba %Z Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] %Z Sciences of the Universe [physics]/Earth Sciences/TectonicsConference papers %X Our lithologic and structural field data are combined with image data from air borne geophysicsand Landsat and Aster satelliteas well as with geochemical and geochronological data from theliterature to better constrain the geodynamic evolution of the Birimian for mations of theKédougou-Kéniéba Inlier (KKI). Thelithological analysis to get her with the availablegeochronological and geochemical data indicates adiachronic evolution from west (Mako Supergroup) to east (Dialé-Daléma Super group). This evolution started by the emplacement westwardof atholeiitic ophiolitic sequencein a deep oceanic environment. It is followedbyan intermediate tofelsiccalc-alkaline volcanism very developed in the eastern part and emplaced ina shallowenvironment.The structural results show a polyphase Eoeburnean to Eburnean deformation. The firstdeformation phase istangential tectonics associated to large over turned folds (P1) and localizedthrusts. It affects the ophiolitic sequence of the Mako Green beltas well assome Dialé-Dalémavolcano-sediments and sediments. This phaseis Eoeburnean and would have occurredbetween 2170 Ma and 2140 Ma. It mainly affects the for mations of the green belt rocks of the MakoSuper group which constitutes the oldest segment of the KKI (2220-2060Ma).The Eoeburnean D1deformation phase is accompanied by the emplacement of granitoid sπ1 (2213-2160 Ma)characterized by syntectonic ductile structures (folds, planarand linear fabrics).The Eburnean D2deformation phase isa transpressive tectonics broad lysinistral which would have occurredbetween 2130 Ma and 2080 Ma. It involved wide thrust sheared corridors (MTZ,FSM) and a P2folding with tilted and curved axis.The D3 phaseis a dextral transtension which reactivates the former structures and createsextensional zones to various scales associated with normal faults. The Eburnean granitoid sπ2(2150-2100 Ma) and π3 (2090-2040 Ma) emplaced during and after the set wo Eburnean orogenicphases. %G English %L insu-02024869 %U https://insu.hal.science/insu-02024869 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ GR %~ OSUR %~ UR1-HAL %~ UR1-SDLM %~ GR-3T %~ UNIV-RENNES2 %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-CHRONOS %~ TEST3-HALCNRS %~ TEST4-HALCNRS %~ RESEAU-TELEDETECTION-INRAE %~ TEST5-HALCNRS