Tepegöl Maars (Ulaş-Sivas)

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Ulaş district of the Sivas province is Yeşildiyar (İtkıran) of the village, 1, 5 km southwest of the village, there are two closed depressions. These depressions are aligned northeast-southwest direction which located in watershed between the Kızılırmak River Basin and Karasu (Fırat) River Basin. Tepegöl I is in the northeast depression, 900 m mouth diameter, bottom diameter 400 metres and has a depth of approximately 130 m. The lake called Tepegöl is located at the base of the depression. The rest of the base is covered with alluvial deposit. Floor level elevation of Tepegöl II is 1851 m and a base diameter of 450 metres and the diameter of the mouth portion 250 meters. The depth of this depression having a circular shape is about 85 meters. It is 60 meters higher than the bottom of the depression in the northeast. These depressions have typical features of maar structures. Pyroclastics are disseminated due to severe gas pressure and deposited as concentric layers with slopes toward outside. Pyroclastics has a thickness of more than 30 metres. Pyroclastic material was partially destroyed as a result of erosive activities. Ophiolitic formation of the base of the rock fragments is observed in layered pyroclastics. Maars have probably occurred in the Plio-Quaternary. Depressions are developed in control of the left lateral strike-slip fault. The Tepegöl Lake, 1791 meters high above sea level, is typically a maar lake.

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Tepegöl , maar , pyroclastic , volcano , lake , Ulaş , Sivas

International Journal of Geography and Geography Education

367

International Journal of Geography and Geography Education