Skip to Main content Skip to Navigation
Journal articles

Structural Styles and Tectonic evolution of the Kolia-Boboti sedimentary basin, Kédougou-Kéniéba inlier, Eastern Senegal

Abstract : New structural data obtained on the Birimian terranes of the Kolia-Boboti sedimentary Basin, the eastern part of the Diale´ -Dale´ma Supergroup in the Ke´dougou-Ke´ nie´ba inlier show two major phases of Eburnean compressional deformation: (1) a D1 phase of thrusting tectonics affected the Lower Birimian B1 tourmalinized sediments. This firsttectonic phase is characterized by isoclinals overturned to recumbent folds P1 with N0408208NE trending axis, associated with axial plane schistosity S0S1 which is mainly transposed in the bedding; (2) a D2 phase of compressional (D2a) and transpressional(D2b) tectonics is responsible for the crossfolds P2a-P2b exhibiting curved axes. These P2 folds are associated with the major schistosity S2, north-south to SW-NE trending, mainly dipping to the south-east. The S2 schistosity is mostly displayed in the large shear zones corridors where it steeply dips locally toward the north-west. A north-west vergence thrusting phase (D2c) of flats and ramps, associated with reverse folds, represents the last Eburnean event. This geometrical feature is characteristic of a ''positive flower structure''. These different Eburnean compressional phases are separated by extensional deformation which is characterized by sedimentary deposits and volcanic flows.
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-00578113
Contributor : Isabelle Dubigeon <>
Submitted on : Friday, March 18, 2011 - 1:50:55 PM
Last modification on : Friday, April 5, 2019 - 8:03:27 PM

Identifiers

Collections

Citation

Moussa Dabo, Tahar Aifa. Structural Styles and Tectonic evolution of the Kolia-Boboti sedimentary basin, Kédougou-Kéniéba inlier, Eastern Senegal. Comptes Rendus Géoscience, Elsevier Masson, 2010, 342 (10), pp.796-805. ⟨10.1016/j.crte.2010.06.002⟩. ⟨insu-00578113⟩

Share

Metrics

Record views

166