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

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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: PAN-AFRICAN DEFORMATION; SOUTHERN CAMEROON; STRIKE-SLIP SHEAR ZONES; THRUST TECTONICS; TRANSPRESSIONAL MODEL

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2010/0042

Publication date: July 1, 2010

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