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

The central part of the Namaqua Metamorphic Province was subjected to intense deformation under high-grade metamorphic conditions up granulite facies, but also shows greenschist facies overprints denoting nature during 1.2–1.0 Ga Namaquan Orogeny. This study examines structural development Kakamas Domain eastern Province, which has not been extensively studied previously. compressional orogenic phase is associated with D1 and D2 events northeast–southwest-directed shortening resulted in southwest-directed thrusting illustrated by an intra-domain thrust southwest-verging isoclinal folds. post-tectonic Friersdale Charnockite Keimoes Suite emplaced D3 event. Late reactivation form Neusspruit Shear Zone D4 event a monoclinic described as deeply rooted structure shear direction towards east. structure, together more local Neusberg Thrust Fault, forms intensely flattened narrow basin Province. Strain vorticity indices suggest transpressional shearing across adjacent regions probably initiated thrust. ~1.2 1.8 km-wide, northwest–southeast striking dextral-dominated constitutes western regional boundary for supracrustal Korannaland Group composed steep, zones relatively high strain, characterised ductile penetrative strain.