Abstract
A study of predominantly folding structures was carried out on a number of outcrops in the Kimbi area. The main aim of this study is to provide a detailed structural characterization of the three folding events (F1, F2-F3) recognized in this area, in order to improve our understanding of the deformation mechanisms that controlled the tectonic evolution of the Pan-African North Equatorial Fold belt. The F1 folding is marked by decimetre-sized isoclinal folds with S1 schistosity parallel to the axial plane of F1 folds. The F2-F3 folding is superposed on the F1 older folds. Geometric shapes of F2-F3 folds typically form Ramsay’s type-3 interference patterns. The complex geometry of these folds suggests that they formed by shearing linked to the Central Cameroon shear zone (CCSZ). The Kimbi area superposed F2-F3 folds have been interpreted as the result of progressive deformation dextral transpressive deformation caused by the oblique convergence between the Congo/Sao Francisco craton and the Eastern Saharan block.
Highlights
The study of fold structures is one of the most important fields of study with respect to orogenesis belts because they are relatively resilient to subsequent deformation and, once created, are difficult to destroy [1]
The first attempt of the overall classification of interference patterns was proposed by Ramsay [3] but the classic work of the fundamental concept of superposed folds was done by Weiss [4]
The superposed folds described in this paper are the result of a series of deformations whose understanding is essential for unravelling the tectonic evolution of their hosting orogen
Summary
The study of fold structures is one of the most important fields of study with respect to orogenesis belts because they are relatively resilient to subsequent deformation and, once created, are difficult to destroy [1]. The common complexities of folds shape geometry are the results of superposed deformation. The first attempt of the overall classification of interference patterns was proposed by Ramsay [3] but the classic work of the fundamental concept of superposed folds was done by Weiss [4]. Folds are a fundamental structure of contractional orogens, and yet deciphering their kinematic history continues to be controversial [5]. The approach to the geometry and kinematical analysis of superposed folds has been mainly experimental [6, 7]. The disadvantage of these analogue models is that they do not accurately express the natural fold examples
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