Journal
JOURNAL OF STRUCTURAL GEOLOGY
Volume 124, Issue -, Pages 51-69Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsg.2019.04.006
Keywords
Zagros Fold-and-Thrust Belt; Multi-detachment folding; Mechanical stratigraphy; Late cretaceous obduction; Thin-skinned versus thick-skinned
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Funding
- ALPIMED project [PIE-CSIC201530E082]
- SUBTETIS project [PIE-CSIC-201830E039]
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We present the first regional balanced and restored sections across the northwestern part of the Zagros Fold-andThrust Belt in Kurdistan Region of Iraq and a 2D kinematic model that illustrates the evolution of the belt since Late Cretaceous time. The balanced cross-section, based on surface and sub-surface data, is characterized by multi-detachment folds detached above a Lower Triassic basal ductile level, with intermediate detachment levels that induced internal complexities like accommodation thrusting and/or disharmonic folding. Our work suggests that the two main structural steps in the detachment level in the High Folded Zone may be related to low-angle thrusts rooted at the brittle/ductile transition. Growth strata of Late Cretaceous and Paleocene times have been recognized for the first time in the Kurdistan Fold-and-Thrust Belt. This allows us to constrain timing of deformation and to estimate the evolution of the shortening and the advance of the deformation front since Late Cretaceous. Deformation of the Zagros belt is characterized by a combination of thin- and thick-skinned tectonics that reactivated the Late Cretaceous-Paleogene obduction belt.
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