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GEOLOGICAL, MINERALOGICAL AND GEOCHEMICAL INVESTIGATION OF THE ULUKISLA (NIGDE/TURKEY) EVAPORITES
Abstract
Ulukisla (Nigde/Turkey) evaporites that compose the study area are situated in Ulukisla Basin at the east of Nigde, South of Central Anatolia. The aim of the study is to investigate the geological, mineralogical and geochemical properties of the gypsum and anhydrites in Ulukisla Evaporites and to determine usage area of the evaporites as an industrial material. For this scope, 50 anhydrite and gypsum samples were collected systematically from the Ulukisla evaporites in 900 m thick area. By XRD (X - Ray Diffraction) investigations, the structure of minerals that forms the anhydrites and gypsum, by geochemical analysis major oxides and trace elements percentages, by polarizing microscope, binocular microscope and SEM their mineralogical properties were determined. Result of the geochemical analysis, samples are pure gypsum minerals including some trace elements. Trace elements are Mg, Al, P, K,, Fe, Rb, and Sr. SEM studies show that there is no different crystal structure in evaporites. Parallel to the surface of lamination and perpendicular to the surface structure was examined. Polarizan microscope studies show the mosaic (lumpy) and diamond mesh textured gypsum. In binocular microscopy examination selenitic gypsum has transparent structure, and under approximately 1-2 mm thick layer of gypsum, there are needle-like objects can be seen easily. According to the analysis results, gypsum in the region are good quality gypsum for the plaster production.
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References10
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