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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2018-6
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
06 Feb 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
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, and Manuel Sintubina 1KU Leuven, Department of Earth and Environmental Sciences, Geodynamics and Geofluids Research Group, Celestijnenlaan 200E, 3001 Leuven, Belgium
apresent address: Irish Centre for Research in Applied Geosciences, University College Dublin, Dublin 4, Ireland
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 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. Differences in fold amplitude, wavelength and shape are explained by changes in mechanical stratigraphy caused by lateral lithofacies variation in ore-bearing horizons. In addition, strong differences in strain partitioning occur within the deforming basin, which is interpreted to be in part controlled by changes in mechanical anisotropy in the layered rock package. This work provides an essential backdrop to understand the influence of the Lufilian orogeny on metal mineralization and (re-)mobilization in the Copperbelt.
Citation: Torremans, K., Muchez, P., and Sintubin, M.: Non-cylindrical parasitic folding and strain partitioning during the Pan-African Lufilian orogeny in the Chambishi-Nkana Basin, Central African Copperbelt, Solid Earth Discuss., https://doi.org/10.5194/se-2018-6, in review, 2018.
Koen Torremans et al.
Koen Torremans et al.
Koen Torremans et al.

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Short summary
A major mountain building event, called the Lufilian orogeny, deformed the rocks that host copper and cobalt ore in the world-class Central African Copperbelt. Key field evidence in this study shows that a single pulse of deformation caused a set of complexly interacting folds and faults. The specific composition and layering in the rock package has a major influence on how the rock sequence was folded.
A major mountain building event, called the Lufilian orogeny, deformed the rocks that host...
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