Folding in the south-eastern Lurestan Province was analysed by measuring anticline’s wavelength and axial-length and by comparing the fold distribution with the available paleofacies maps. It was found that the large variability of the measured parameters occurs in relation with facies changes within the Cretaceous Bangestan Group, which acts as the competent carbonate unit that governs buckling in this region. The Oligocene-Miocene Shahbazan-Asmari unit folds harmonically with the Bangestan Group, except in the areas where the Paleogene deposits interposed between the two units exceed 1300m of thickness. In these areas the Shahbazan-Asmari carbonate displays short wavelength folds that indicate a complete decoupling from the underlying folds of the Bangestan Group. It is suggested that this decoupling occurs because the summed thickness of the incompetent units separating the Shahbazan-Asmari from the Bangestan Group exceeds the extension of the effective zone of contact strain of the Bangestan Group folds.


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