TITLE:
Structural Study and Analytical Modeling of Mangerak Salt Diapir (South West of Firozabad Fars-Iran)
AUTHORS:
Anahita Keynejad
KEYWORDS:
Diapirism, Zagros, Salt Domes of Mangerak, Structural Deformation, Analytical Modeling
JOURNAL NAME:
Open Journal of Geology,
Vol.7 No.1,
January
16,
2017
ABSTRACT: Mangerak salt diapir is in the South West of Firuz
Abad in Fars province, southern Iran and structurally, it is exposed in the
simple folded belt of Kohzad Zagros. This diapir, now, is located in a transtentional zone in the overlapping parts of
Koreh Bas right fault zone. The origin of this diapir is evaporative series of
Hormuz, at the beginning of the Cambrian and ending Precambrian age. In this
paper, we investigated tectonic structures around the salt dome of Mangerak. By
promoting this salt dome, a variety of structures, such as marginal reverse
faults, radial normal faults, folds and caves have been developed. In addition,
many changes can be seen in the status line, and the amount and direction of
the strata dip, thickness of rock units, and facies change, that all showed the
downbuilding phenomenon in the diapir. The method was based on structural desert
surveys and relevant measurements. The
results show that salt domes above were rising during the Late Cretaceous-Paleocene, and
pre-deformation of Zagros and in connection with basement Fault of Korebas, and
probably, when sedimentation was in the Zagros basin, they have been exposed in
the form of an island. Zagros deformation at the same time, the pressure
released from the collision zone on the north side of the East and its wave
motion, to the South West, exerts more pressure on the salt horizons and helps
them to erupt. About Mangerak salt dome, which is exposed on the side of the
Sayakh anticline axis and Basement fault of Korebas, two phenomena are
effective in its exposing. Analytical modeling shows the life of the outcrop
31,000 years that this age is consistent with the effects of salt dome
Neotectonic.