Morphotectonic Investigation of Talkhab and Tozlugl faults and their role in the formation of the Meyghan Wetland, Arak

Abstract :

Meyghan lake of Arak is located at the boundary of the metamorphic zone of Sanandaj- Sirjan and Urmia-Bazman. The two main faults of Talkhab and Tozlugol (Tabarte) play a key role in the formation of this basin by right lateral movement and northwest - south east trend. In this study, morphotectonic indices were investigated to study the tectonic activity of these two faults. Altimeter integral index, Asymmetry index,Stream length gradient index, Basin shap factor Including measured indicators. Investigating the relative active tectonic using the above indicators shows that the Arak region has a moderate to high relative activity. Particularly, the separation region between the two Talkhab and Tozlugol faults is more active than other regions. The graben of the Meyghan Desert is formed due to the activity of the Tabakh and Thouzlugal faults during the Pleistocene by right lateral transpression zone. The southwestern side of the lake is in accordance with the Tozlugol fault. It seems that according to the morphometric studies of this area, the activity of the Talkhab fault is more than the Tozlugol fault and plays a more important role in the formation of the Meyghan lake.

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