رخساره هاي رسوبي و چينه نگاري سكانسي سازند تيرگان در برش هاي جوزك و چمن بيد در غرب حوضه رسوبي كپه داغ و انطباق با نواحي شرق حوضه

Sedimentary Facies and Sequence Stratigraphy of Tirgan Formation at Jozak and Chaman-Bid Sections in the Western Kopet-Dagh Basin and Correlation with Eastern Parts

Tirgan Formation (Barremian-Aptian) in the Kopet-Dagh basin mainly consists of oolitic and orbitolina limestones that conformably overlies and underlies the Shurijeh and Sarcheshmeh Formations, respectively. Two stratigraphic sections in south west of Jozak (315 m) and Chaman Bid (242 m) area were measured and sampled. Petrographical studies indicate that these sediments may have been deposited on a shallow carbonate platform ramp type and consist of 4 carbonate lithofacies (12 subfacies). These lithofacies indicate that they may have been deposited in open marine, shoal, lagoon and tidal flat environmental conditions. Sequence stratigraphy analysis led to identification of 4 third-order depositional sequences, bounded by type 2 sequence boundaries. Comparison of interpreted sea level change of study area and three measured sections in the eastern Part of the basin indicate that the depth of basin decrease toward east and south east.