Abstract
Oblique continent—continent collision between Iranian microcontinent and Arabian plate is the main cause of transpression and transtension regimes in this area. Zagros orogeny in this area resulted in formation of various structures including thrust fault-related folds, dextral and sinistral, strike slip faults, normal fault related to dextral strike slip fault. Thrust faults within the area under study are duplex with general trend of NW-SE and dip toward the north-east with right slip component. Strike slip fault regime acts as tear fault and it is active yet. Therefore, simultaneous presence of thrusts and strike slip faults illustrates convergent dextral transpressional tectonic regime while this transpressional regime accompanied with transtension as well; since normal faults are also seen in alluvium around depression of Sirjan which can be as a result of extension stresses due to strike slip faults activity of the district. The results achieved from geometry and kinematic analysis of west of Sirjan structures indicate that structures of the area have characteristics of internal part of Zagros orogeny.
Highlights
From tectonic point of view, the region under study has been located in internal part of Zagros orogeny and southern part of Sanandaj-Sirjan metamorphic zone
Oblique collision of NE edge of Arabian plate with Sananadaj-Sirjan zone along of Zagros suture in early cretaceous is the factor of establishing dextral convergence transpression tectonic regime on this zone [6]
The analysis of Kinematic indicators of the area indicates that structure formation of the area is interrelated to Zagros orogeny
Summary
From tectonic point of view, the region under study has been located in internal part of Zagros orogeny and southern part of Sanandaj-Sirjan metamorphic zone. Due to convergence and collision of central Iranian microcontinent with Arabian plate and followed by Neotethys ocean closure, Zagros orogeny belt has been created [1]-[8]. The aim of the study is to identify all important structures of west Sirjan region which has important role in creation of present deformations and morphology of the area. These structures, using data obtained from the field studies and geological maps, analyzed from geometric and kinematic point of view, and their structural evolution has been deduced
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