Role of Diapirism on Stratigraphy Evolution of Mangrak Salt Dome Basin (South West Firozabad)

Subject Areas :

anahita  keynezhad ¹ (Islamic Azad University, Chalus branch)
Ghis  Badkhashan Moomtaz ² (کارشناس ارشد زمین شناسی - تکتونیک، تهران)
Moslem  Ghavam Abadi ³ (کارشناس ارشد زمین شناسی، تهران)
Zahra  Rezaee ⁴ (دانشجوی دکتری زمین شناسی ساختمانی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران)

Received: 2016-04-18 Accepted : 2016-04-18 Published : 2016-03-20

Keywords: Zagros, Diaprism, Mangarak salt dome, Strata deformation,

Abstract :

The studied area is located in South West of Firozabad city in Fars province, south west of Iran, and structurally situated in Zagros zone. Tectonically, the area  is active and has numerous salt domes.  Existence of thick layers of salt in Hormuz complex and consequently appearance of salt domes in this area, effected on the ancient deposition and sedimentary basin. Salt rising on one side and subsidence of sedimentary basin on another side, caused of drastic changes in sedimentary basin near the salt dome. Range of changes is related to the depth of sedimentary basin and tectonic movements, during Permian period to present. During of sea regression and transgression periods in the wide Zagros basin, these changes effected significantly in salt dome rising areas. To achieve this goal, Mangarak salt dome in the southwest of  Firozabad was chosen and researched data. The result of these studies indicate that salt dome has been rising at late Cretaceous - Paleocene and found great changes in thickness of sediments which around it.Absolutely, this salt dome existed before deformation of Zagros basin and probably it has been exposed such as island in late paleogene and Neogene (such as the Persian Gulf Island’s salt domes).