Timing and kinematics of Eburnean tectonics in the central Reguibat Shield, Mauritania

摘要: The Reguibat Shield of north Mauritania comprises a western Archaean terrane dominated by gneisses and granitic rocks an eastern Eburnean largely made up Palaeoproterozoic metasedimentary rocks. These were juxtaposed during the c . 2.1–2.0 Ga Orogeny, which formed approximately north-trending front contiguous with belt Leo in equatorial West Africa. Geological surveying Sfariat region has shown that metamorphosed continental margin succession been intruded intercalated synorogenic granitoids transported SW onto foreland sinistral oblique collision preserved as strongly partitioned D 1 shortening 2 strike-slip-dominated transpression within Belt. This was subsequently affected retrogressive dextral transcurrent deformation propagation en echelon Imarkene Tmeimichat fault zones. Laser ablation conventional thermal ionization mass spectrometry U–Pb geochronology carried out on five samples rock migmatitic gneiss from region, reveal anatexis took place between 2117 2064 Ma. Timing kinematics event are similar to those for Shield, underwent SW-directed at this time.