Author/Authors :
Maghfouri Moghadam، I نويسنده Department of Geology, Faculty of Science, Lorestan University, Khorram-Abad, Iran , , Borji، S نويسنده Department of Geology, Ashtian Branch, Islamic Azad University, Ashtian, Iran , , Amini، E نويسنده Department of Geology, Ashtian Branch, Islamic Azad University, Ashtian, Iran , , Azadbakht، S نويسنده Payame Noor University, Khorram-Abad, Iran , , Taherpour Khalil Abad، M نويسنده Young Researchers Club and elites, Mashhad Branch, Islamic Azad University, Mashhad, Iran ,
Abstract :
The Qom Formation, a series of shale, sandstone and carbonate deposits, is a result of the last transgression of the sea in the
Central Iran sedimentary basin. Foraminifera are one of the most important and numerous fossil groups present in the Qom
Formation. In this study, the micropaleontology of the Qom Formation, located in southwestern Tafresh is divided into three
measured stratigraphic sections (Rakin, Band-e-Ali Naghi Beig and Hezar Abad). From a stratigraphic point of view, except for the
Rakin section, the lower and upper boundaries of the Qom Formation are similar to Lower and Upper Red formations. There is,
however, no outcrop on the upper boundary of the Rakin stratigraphic section. The study of 78 samples taken from the studied
sections led to the identification of 34 genera and 39 species of benthonic foraminifera, 2 genera and 2 species of planktonic
foraminifera, 4 genera of red algae and 3 genera of bryozoan. Based on the recognized foraminifera such as Lepidocyclina
(Nephrolepidina), Miogypsioides sp., Meandropsina anahensis and Ammonia beccarii the age of the Qom Formation in the Rakin
stratigraphic section was determined to be Chatian-Aquitanian while the Band-e-Ali Naghi Beig and Hezar Abad stratigraphic
sections were determined to be Aquitanian.
