TITLE:
Formation of Extensional Basin in Internal Part of the Zag-Ros Orogeny in West of Sirjan, Iran
AUTHORS:
Amin Azadikhah, Soheila Bouzari, Ali Yassaghi, Mohammad Hashem Emami
KEYWORDS:
Zagros Orogeny, Thrust Faults, Transpression, Strike Slip Faults
JOURNAL NAME:
Open Journal of Geology,
Vol.5 No.11,
November
30,
2015
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.