Micro facies and sedimentary environment of the Qom formation in Verjun-Khur Abad area

Subject Areas :

Keyvan khaksar ¹ , Masoomeh Sohrabi-mollayousefy ² , Saeed rahmanian ³

1 - استادیار دانشگاه آزاد اسلامی واحد قم
2 - استادیار گروه زمین شناسی دانشگاه آزاد اسلامی واحد اسلامشهر
3 - کارشناس ارشد دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران

Received: 2016-09-07 Accepted : 2016-09-07 Published : 2010-09-23

Keywords: Petrography, Qom Formation, microfacies, Oligo_Miocene, Carbonated Ramp, geomorphology,

Abstract :

Qom Formation in the section of Verjun-KHurabad area constitutes 852 meters of limestones in thin layers tothick layers, marl, gypsiferous marl, sandstones, and lime sandstones. Its lower contact (section a) is abrupt andmild unconformity with lower red formation. Its upper contact (section f) is gradual and concordant with upperred formation. Besides sampling, lithology changes, stratigraphy, geomorphology of stone units was examined.The results led to drawn the stratigraphy log of Qom Formation in the studied area. Petrography and microfaciesstudies together with field evidences led to recognition of eight carbonated microfacies in different parts of QomFormation. This microfacies lied on the tidal, barrier, lagoon and open marine environments. The study of faciesand their succession in the mentioned area and compare with modern and old sedimentary environment showsthat Qom Formation was deposited in a warm marine environment. Also, the facies of Qom Formation in thestudied area was deposited in a carbonated ramp environment