Determining the age and sedimentation rate of Mishan Formation in the northeast of Dezful embayment based on magnetostratigraphic method

Mishan Formation is one of the Neogene stratigraphic units that is widely distributed in the south and southwest of Iran. In recent years, in order to achieve the exact age of this formation, studies have been carried out using fossil data and the use of strontium isotopes. In the young folded areas, such as Zagros folded belt that containing sediments that have not been deeply buried, using magnetostratigraphic study is one of the most appropriate methods for obtaining the age of sediments. This method can be used for non-marine sediments such as alluvial deposits that often lack the biostratigraphic and radiometric properties for age determination can also obtain the sedimentation rate of the studied sequence. In the present study, the age of the Mishan Formation was studied using magnetostratigraphic method in Jarik anticline on the northeast of Dezful embayment. In the studied section, the age of the lower and upper boundary of the Mishan Formation, is estimated to be 14.1 and 13.6 million years (middle Miocene) respectively. Also the average sedimentation rate for this formation (after secondary compaction) was obtained 38 cm / 1000 years.