Solid Earth Discuss., https://doi.org/10.5194/se-2018-6 Manuscript under review for journal Solid Earth Discussion started: 6 February 2018 c Author(s) 2018. CC BY 4.0 License. Non-cylindrical parasitic folding and strain partitioning during the Pan-African Lufilian orogeny in the Chambishi-Nkana Basin, Central African Copperbelt Koen Torremans1, Philippe Muchez1, Manuel Sintubin2 5 1KU Leuven, Department of Earth and Environmental Sciences, Geodynamics and Geofluids Research Group, Celestijnenlaan 200E, 3001 Leuven, Belgium. 2Present address: Irish Centre for Research in Applied Geosciences, University College Dublin, Dublin 4, Ireland. Correspondence to: Koen Torremans (
[email protected]) 1 Solid Earth Discuss., https://doi.org/10.5194/se-2018-6 Manuscript under review for journal Solid Earth Discussion started: 6 February 2018 c Author(s) 2018. CC BY 4.0 License. Abstract. A structural analysis has been carried out along the southeast margin of the Chambishi-Nkana Basin in the Central African Copperbelt, hosting the world-class Cu-Co Nkana orebody. The geometrically complex structural architecture is interpreted to have been generated during a single NE-SW oriented compressional event, clearly linked to the Pan-African 5 Lufilian orogeny. This progressive deformation resulted primarily in asymmetric multiscale parasitic fold assemblages, characterized by non-cylindrical NW-SE elongated, periclinal folds that strongly interfere laterally, leading to fold linkage and bifurcation. The vergence and amplitude of these folds consistently reflect their position along an inclined limb of a NW plunging megascale first-order fold. A clear relation is observed between development of parasitic folds and certain lithofacies assemblages in the Copperbelt Orebody Member, which hosts most of the ore.