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Carbonates and Evaporites

, Volume 26, Issue 3, pp 255–271 | Cite as

Microfacies analysis and paleoenviornmental interpretation of the Qom Formation, South of the Kashan, Central Iran

  • Ebrahim MohammadiEmail author
  • Amrollah Safari
  • Hossein Vaziri-Moghaddam
  • Mohammad-Reza Vaziri
  • Mehdi Ghaedi
Original Article

Abstract

Qom Formation (Oligo-Miocene marine deposits, Central Iran) in the South of Kashan, was studied in order to determine its microfacies and depositional environment. Thirteen microfacies (MF A–M) were distinguished based on petrography, sedimentological features, components distribution and present fauna. According to recognized microfacies and absence of gravity deposits, real and continuous reef, barrier and storm structures, carbonate platform of the Qom Formation in South of Kashan developed on an open shelf without effective barriers separating it from the sea. The co-occurrences of miliolids and planktonic foraminifera in planktonic microfacies is the reliable evidences for absence of any reefal, oolitic and bioclastic barriers in depositional environment, and deposition of the study section on an open shelf, as in the absence of barrier, currents removed miliolids to deeper parts of sea (basin). Three major depositional environments were identified in the Oligo-Miocene succession in the study section, on the basis of the distribution of the foraminifera and vertical facies relationships. They include inner shelf, middle shelf and proximal outer shelf. Inner shelf includes MF A–G and characterized by abundant imperforate foraminifera. Middle shelf comprises MF H–J and characterized by association of larger benthic foraminifera with hyaline wall. Proximal outer shelf includes MF K–M and characterized by the presence of planktonic foraminifera and absence of larger benthic foraminifera, as well as abundance of light-independent, heterotroph organisms.

Keywords

Qom Formation Central Iran Kashan Oligo-Miocene Benthic foraminifera Planktonic foraminifera Open shelf Tethyan Seaway 

Notes

Acknowledgments

The authors wish to thank the anonymous reviewers for their helpful and constructive comments. Dr. Mehdi Yazdi, Dr. Ali Seyrafian, Dr. Ali Bahrami, Dr. Mohammad Mohammadi-Monfared, Mohammad Allahkarampour Dill, Asghar Roozpeykar, Rahman Azadbakht, Dr. Reza sadeghi, Dr. Abdollah Amini, Hassan Safdari, Zahra Babaei, Chavare Bayazidi and Samira Shahriari Garaei are thanked for useful discussions and suggestions. Dr. Hossein Batouli is gratefully acknowledged for the valuable help in the field. We also would like to thank the University of Isfahan, Shahid Bahonar University of Kerman and National Iranian Oil Research and Development for the financial support.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Ebrahim Mohammadi
    • 1
    Email author
  • Amrollah Safari
    • 2
  • Hossein Vaziri-Moghaddam
    • 2
  • Mohammad-Reza Vaziri
    • 1
  • Mehdi Ghaedi
    • 2
  1. 1.Department of Geology, Faculty of SciencesShahid Bahonar University of KermanKermanIran
  2. 2.Department of Geology, Faculty of SciencesUniversity of IsfahanIsfahanIran

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