Tectonics
Mojtaba Ershadinia; Farzin Ghaemi; Massoud Homam
Abstract
The Fariman complex is located in the northeast of Iran and southeast of Mashhad, contains a variety of rocks from the Permian to the present era that have undergone several stages of deformation. In this paper, the structural geometry of faults and folds of the region is analyzed and based on it, the ...
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The Fariman complex is located in the northeast of Iran and southeast of Mashhad, contains a variety of rocks from the Permian to the present era that have undergone several stages of deformation. In this paper, the structural geometry of faults and folds of the region is analyzed and based on it, the deformation stages of Fariman complex are identified, which indicates its evolution during 3 stages of deformation. In the first stage of deformation, tectonic forces along with the thermal stage have caused the transformation of sediments and the formation of first generation foliation and folds in the region. First-generation thrusts also formed during this phase, thrusting Palaeotethys remnants. The second stage of deformation has led to the formation of the second generation of thrusts and folds in the region. Kinematic analysis of second generation thrusts indicates two reverse motion phases with leftlateral strike-slip component and right–lateral strike–slip with reverse component.Its reverse motions, which result in the formation of misplaced massive carbonate associated with the second stage of deformation, and its dextral motion, which cut and displace previous structures and affect all rock units in the region, the third stage of deformation is analyzed.
M Ramazani; M. R. Ghassemi; A. Zanchi; M. R. Sheikholeslami
Abstract
The Dare Anjir and Fariman complexes in NE of Iran are considered as remnants. These complexes considering were located close to Palaeotethys suture zone, and thus they record its structural evolution. considering structural and petrological evidences and against previous opinions that considered Fariman ...
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The Dare Anjir and Fariman complexes in NE of Iran are considered as remnants. These complexes considering were located close to Palaeotethys suture zone, and thus they record its structural evolution. considering structural and petrological evidences and against previous opinions that considered Fariman complex as an accretionary wedge, these complexes seem to be remnants of a magmatic arc that formed as a result of subduction of the Palaeotethys beneath Turan plate in Permian-Triassic. Fariman complex may be divided into upper and lower parts. At least two deformation phases may be recognized in upper part of the Fariman complex. second deformation phase caused creation fault propagation folds, and probably was coeval with main deformation phase of Eo-Cimmerian that affected Aghdarband basin. Deformation style in Fariman and DareAnjir complex is compatible with strain partitioning proposed for Aghdarband transpressional zone as a result of oblique convergence between Iran and Turan during Eo-Cimmerian event.
