Active deformation and relief evolution in the western Lurestan region of the Zagros mountain belt: new insights from tectonic geomorphology analysis and finite element modeling

Basilici, Matteo; Ascione, Alessandra; Megna, Antonella; Santini, Stefano; Tavani, Stefano; Valente, Ettore; Mazzoli, Stefano

doi:10.1002/essoar.10503561.1

Cited by 2 publications

(2 citation statements)

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“…It is worth noting that the envisaged tectonic evolution, characterized by late‐stage basement thrusting in the frontal part of the chain, is common to other fold and thrust belts of the world (e.g., Tavani et al., 2021; and references therein). In particular, the process of upper crustal thrust ramp development in the outer Albanides is rather like that controlling the recent (<5 Ma) uplift of a prominent topographic feature—the Mountain Front Flexure—in the Lurestan sector of the Zagros Mountains (Basilici, 2020; Basilici et al., 2020; Emami et al., 2010; Homke et al., 2004; Koshnaw et al., 2017). Tavani et al.…”

Section: Discussionmentioning

confidence: 99%

Space and Time Variability of Detachment‐ Versus Ramp‐Dominated Thrusting: Insights From the Outer Albanides

Mazzoli

Basilici

Spina³

et al. 2022

Tectonics

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Despite their markedly different structural setting, the northern and southern outer Albanides share a common tectonic evolution from detachment‐dominated to ramp‐dominated, basement‐involved thrusting. The former process (mainly Oligocene to Miocene) is essentially related with the occurrence of a thick décollement level represented by Triassic evaporites, while the latter involves basement ramps splaying out from a middle crustal décollement. As this weak crustal layer is inherited from the Mesozoic rifting stage, the original continental margin architecture is interpreted to strongly influence subsequent convergent deformation. The profoundly different nature of the two dominant décollements in the study area controlled the structural style of the fold and thrust belt. The decoupling capacity of the upper décollement is strongly dependent on the thickness of the Triassic evaporites. Where this is significant (≫1 km; southern outer Albanides), the occurrence of such a thick incompetent layer at the base of competent carbonate units favored the development of break‐thrust folds and imbrication of the sedimentary cover. Fold and thrust belt propagation was instead hindered where original stratigraphic variations resulted in a reduced thickness (≤1 km) of Triassic evaporites. On the other hand, the deeper middle crustal décollement is controlled by basement rheology. Its reactivation during plate convergence was assisted by collision‐related thermal weakening of the crust. This process governed late‐stage (<5 Ma) crustal‐scale tectonic inversion and plays a major role in controlling present‐day seismicity.

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Section: Discussionmentioning

confidence: 99%

Space and Time Variability of Detachment‐ Versus Ramp‐Dominated Thrusting: Insights From the Outer Albanides

Mazzoli

Basilici

Spina³

et al. 2022

Tectonics

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“…The ZFF fault extends through sedimentary rocks and cuts simple folding of Bakhtiari, Lahbari, Aghajari formations (B, L and A labels in figure, respectively) [13]; Arrow shows the relative velocity of Arabia with respect to Eurasia in mm/year [14]; green circles indicate aftershocks up to 15 July 2021. (c) A simplified cross-section through northeast to southwest of (a) [15][16][17]. (d) Geological profile of SS' in (b) and enlarged (c) section [10,13].…”

Section: Geological and Tectonic Settingmentioning

confidence: 99%

Surface Displacement and Source Parameters of the 2021 Bandar-e Genaveh, Iran, Earthquake Determined from InSAR Observations

et al. 2022

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On 18 April 2021, a MW 5.8 earthquake occurred near the city of Bandar-e Genaveh, southwestern Iran. Four synthetic aperture radar (SAR) images, acquired from Sentinel-1 (ESA Copernicus project) satellites in ascending and descending orbits, were used to get two displacement maps, catching the surface co-seismic effects through the two-pass InSAR technique. Modeling the deformation patterns using equations for a shear dislocation in elastic half-space allowed the source parameters and the slip distribution of the seismogenic source to be determined. We calculated that the rupture occurred on a reverse fault extending NW-SE, gently dipping NE and with a maximum slip reaching about 1 m. The northeast and low-dip angle of this fault are also consistent with the tectonics of the region, which is subject to deformation and shortening along the northern margin of the Arabian plate. Our estimations of the fault parameters agree with the Zagros Foredeep reverse fault. We additionally processed four other SAR images to investigate the possibility that the Mw 5.0 aftershock, which occurred about one month later, induced surface effects visible with InSAR. This analysis, however, did not provide any clear conclusions.

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Active deformation and relief evolution in the western Lurestan region of the Zagros mountain belt: new insights from tectonic geomorphology analysis and finite element modeling

Cited by 2 publications

References 82 publications

Space and Time Variability of Detachment‐ Versus Ramp‐Dominated Thrusting: Insights From the Outer Albanides

Space and Time Variability of Detachment‐ Versus Ramp‐Dominated Thrusting: Insights From the Outer Albanides

Surface Displacement and Source Parameters of the 2021 Bandar-e Genaveh, Iran, Earthquake Determined from InSAR Observations

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