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Sedimentary environment and depositional sequences of the Oligocene Qom Formation in Central Iran based on micro-facies and microtaphofacies analysis

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Abstract

Oligocene deposits of the Qom Formation in central Iran were studied to reconstruct the sedimentary environment and depositional sequences based on microfacies (MF) and micro-taphofacies (MTF) analysis. A total of 310 thin sections (210 and 100 from Vidoje and Neizar respectively) were studied to differentiate eight microfacies (MF) and five microtaphofacies (MTF) types. These MFs are representative of a variety of depositional environments including restricted and semi-restricted lagoons as well as open marine settings. Overall, the distribution of MFs at the two sites suggests an open-shelf setting for the Qom Formation. Three complete third-order depositional sequences together with one incomplete sequence were identified. In the Rupelian stage, sea level changes in the Neizar and Vidoje areas were most likely affected by tectonics controlled by regional faults, whereas regional sea-level fluctuations of the south Tethyan Seaway and the Paratethys Basin controlled sea-level changes in the Chattian stage.

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Fig. 1

adapted from Heydari 2008). b Oligocene paleogeography of the Tethyan seaway and location of the Esfahan-Sirjan fore-arc and the Qom back-arc sub-basins (modified from Harzhauser and Piller 2007 and Reuter et al. 2009). c Schematic block diagrams illustrating the development of the Esfahan-Sirjan and the Qom basins in Oligocene time (modified from Reuter et al. 2009)

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Acknowledgements

The authors would like to thank the University of Isfahan for the financial support. We are grateful for the useful suggestions and helpful comments of Dr. Liviu Giosan.

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  1. Department of Geology, Faculty of Sciences, University of Isfahan, 81746-73441, Isfahan, Iran

    Amrollah Safari, Hossein Ghanbarloo, Amirhossein Kasiri & Saber Mahmudi Purnajjari

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Safari, A., Ghanbarloo, H., Kasiri, A. et al. Sedimentary environment and depositional sequences of the Oligocene Qom Formation in Central Iran based on micro-facies and microtaphofacies analysis. Carbonates Evaporites 35, 100 (2020). https://doi.org/10.1007/s13146-020-00633-1

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