Polyphase deformation of the high-grade metamorphic rocks along the Neusspruit shear zone in the Kakamas domain: Insights into the processes during the Namaquan orogeny at the eastern margin of the Namaqua metamorphic province, South Africa
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Date
2021Author
Sonwa, Cyrille Stephane Tsakou
Donker, Jan van Bever
Bailie, Russell
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The central part of the Namaqua Metamorphic Province was subjected to intense deformation under high-grade metamorphic conditions up to granulite facies, but also shows greenschist
facies overprints denoting the metamorphic nature during the 1.2–1.0 Ga Namaquan Orogeny. This
study examines the structural development of the central Kakamas Domain of the eastern Namaqua
Metamorphic Province, which has not been extensively studied previously. The compressional
orogenic phase is associated with D1 and D2 deformation events during which northeast–southwestdirected shortening resulted in southwest-directed thrusting illustrated by an intra-domain thrust
and southwest-verging isoclinal folds. The post-tectonic Friersdale Charnockite of the Keimoes
Suite is emplaced during the D3 deformation event. Late reactivation of the intra-domain thrust in
the Kakamas Domain to form the Neusspruit Shear Zone during the D4 event is of a monoclinic
nature and is described as a deeply rooted structure with shear direction towards the east. This
structure, together with the more local Neusberg Thrust Fault, forms part of an intensely flattened
narrow basin in the eastern Namaqua Metamorphic Province.