Original paper

The Awae Ayos strike-slip shear zones (southern Cameroon): Geometry, kinematics and significance in the late Pan-African tectonics

Olinga, Jean Bosco; Mpesse, Jean Engelbert; Minyem, Dieudonné; Ngako, Vincent; Mbarga, Théophile Ndougsa; Ekodeck, Georges Emmanuel

Abstract

The Pan-African deformation of the Awaé - Ayos group (southern segment of the Neoproterozoic fold belt of Cameroon, Central Africa) is controlled by thrust tectonics and late strike-slip shear zones: the thrusting of the Pan-African Nappe over the Congo Craton (D2 deformation phase) is followed by a strike-slip shearing trending ENE-WSW (D3 deformation phase). During these stages deforming conditions were ductile to brittle-ductile. The dominant structural features of the D3 phase are penetrative foliation steeply dipping N or S, an associate ENE-WSW trending stretching lineation, and an N-S to NE-SW directed folding. Deformation criteria in the distinguished rock units indicate dextral sense of shear. An overall dextral transpressional model is assumed to explain these thrust and shear movements.

Keywords

southern cameroonpan-african deformationthrust tectonicsstrike-slip shear zonestranspressional model