minerals Article 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 Cyrille Stephane Tsakou Sonwa * , Jan van Bever Donker and Russell Bailie Department of Earth Sciences, University of the Western Cape, Private Bag X17, Bellville, Cape Town 7535, South Africa;
[email protected] (J.v.B.D.);
[email protected] (R.B.) * Correspondence:
[email protected]; Tel.: +27-21-959-2637 Abstract: The central part of the Namaqua Metamorphic Province was subjected to intense deforma- tion 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–southwest- Citation: Tsakou Sonwa, C.S.; van directed shortening resulted in southwest-directed thrusting illustrated by an intra-domain thrust Bever Donker, J.; Bailie, R. Polyphase and southwest-verging isoclinal folds. The post-tectonic Friersdale Charnockite of the Keimoes Deformation of the High-Grade Suite is emplaced during the D3 deformation event. Late reactivation of the intra-domain thrust in Metamorphic Rocks along the the Kakamas Domain to form the Neusspruit Shear Zone during the D4 event is of a monoclinic Neusspruit Shear Zone in the nature and is described as a deeply rooted structure with shear direction towards the east.