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Depositional history and sequence stratigraphy of Tirgan formation (Barremian-Aptian) in central Kopet Dagh, NE Iran
Authors:M. Javanbakht  S. Ghazi  R. Moussavi-Harami  A. Mahboubi
Affiliation:1. Department of Geology, Islamic Azad University-Science and Research Branch, Tehran, Iran
2. Institute of Geology, University of the Punjab, Lahore, 54590, Pakistan
3. Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran
Abstract:The Tirgan Formation (Barremian — Aptian) is exposed in the Kopet Dagh in northeast Iran. Two stratigraphic sections in Radkan and Chenaran were measured. Their thickness are 238 m and 119 m, respectively. This formation in measured sections consists of three parts (including lower carbonate, middle limy shale — marl and upper carbonate rocks). Based on study of 164 thin-sections, 15 carbonate and 2 siliciclastic lithofacies have been identified. Carbonate lithofacies are deposited in a ramp platform in fore shoal, shoal, lagoon and tidal flat environments. Sea level changes during lower Cretaceous led to the formation of different large-scale depositional sequences Radkan (two) and Chenaran (two) respectively. The present study highlights the reconstruction of tectonic history of the area during lower Cretaceous.
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