Geologische Kartierung der Farm Okaparakaha im Damara Orogen/Namibia

Abstract

Abstract provided by author:

The foliation planes (SI) which developed during static burial metamorphism werereorientated as the result of a north-west directional stress field and generally strikenortheast-southwest

Increasing tectonic stress resulted in movement parallel to the foliation planes. The second deformation phase gave rise to micro-folds with b-axes generally plunginggently towards the westnorthwest

A recrystallisation of minerals (post-D2) occurred during a post-orogenic thermic event (which affected the rocks)

The synorogenic fracture pattern (ac-, be- and shear ruptures) is orientated according to thevgeometrical relationship with the northwest-southeast directional stress field. A few of these fractures/joints (e. g. the escarpment in the mapped area) were reactivated during the late Mesozoic as a result of the opening of the South Atlantic Ocean. They characterize the present morphology of the area

During the Damara Orogenesis the rocks underwent two synorogenic deformation phases (D1, D2)