Scholarly record

HYDROGEOLOGICAL CHARACTERISTICS OF BEYSEHIR LAKE AND ENVIRONS

A. Bozdag, A. F. Bayram, I. Ince

Abstract

The most important creeks discharging to the Beysehir Lake (Sarisu, Ustunler, Ebulvefa, Eflatun) and their drainage area form the southeast basin of the lake. In this study will be given briefly the rocks in these basins and their hydrochemical relation with surface and subsurface water The Lower – Middle Cambrian Caltepe formation comprises of dolomite, crystallized limestone and nodular limestone, occurs at the basement and, has reservoir rock characteristics. The Upper Cambrian – Lower Ordovician Seydisehir formation overlies conformably the Caltepe formation and comprises of schist, phillite and shale bearing limestone and quartzite lenses in places. The Anamasdagi formation which is the most important reservoir rock in the study area has widespread outcrops around the lake and rest unconformable on the Seydisehir formation. It is composed of conglomerate, marl, sandstone, ferric bauxite, dolomite, limestone and, is Upper Jurassic – Upper Cretaceous in age. The Hoyran complex comprising of serpantinite, pyroxenite, harzburgite, dunite, diabase and chromites emplaced tectonically over the abovementioned units. This unit has outcrops starting from northern part of the Beysehir lake extending approximately in the NNW- SSE direction up to the Yesildag town located at the south of the lake. Besides, the Eocene Buyukkopru formation comes unconformable on these units and, begins at the bottom, with the red marl and continues with mudstone – claystone – turbiditic sandstone. The Toprakli formation is made up of partially consolidated pebble, sand and clay and, covers all the abovementioned units. Karstification and their size in the limestone which are widespread in the basin and which are mostly forming the reservoir rock were interpreted by means of their chemical analysis results. The permeability of alluvial sediments was determined with sieve analysis. The variations in the water level of the lake were interpreted statistically. The chemical analysis results of surface and spring water were evaluated in different diagrams and the possibly of these water as being drinkable and usable were searched.

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