Formation Condition and Properties of The Various Types Of Gypsum Occurrences At Sivrihisar (Eskişehir, Turkey)

T. ALTAY, M. Ç. KARAKAYA, Y. ERKAN

Abstract


The study area is located in southeast of the town of Sivrihisar (Eskişehir, Central Anatolia).
The rocks (Neogene Age) located in the study area is divided into two lithostratigraphic units, namely
İlyaspaşa (Lower-Middle Miocene) and Sakarya (Upper Miocene-Pliocene) formations. Sakarya
formation is the subdivided into four members namely Gypsum, Lower Limestone, Clayey Dolomite
and Upper Limestone. Gypsums show different crystal habit as lenticular, discoidal, rosette and
swallow-tail in the field. Gypsum crystals are seen as massive levels, bedded gypsum, fracture filling
and scattered within dolomite. Massive and bedded gypsum which interbedded with dolomite layers
consist of only lenticular and discoidal gypsum crystals. These are white colored and finely crystalline
(clay to sand sized). Also other gypsum crystals show different colors as bluish-grayish colored and light
brown. Based on X-ray powder diffraction data, the mineralogical associations of all sections comprise
mainly dolomite, gypsum, calcite, locally sepiolite, and in a few cases, palygorskite, smectite, illite and
kaolinite. Coarse crystalline gypsum occurrences (discoidal, swallow-tail, rosette) contain a higher
percentage of clay minerals than the smaller gypsum crystals. The study area has been influenced by
freshwater, weak alkaline and alkaline conditions. The SO3
2-
contents of clay-sand sized gypsum
occurrences are found to be lower than in other gypsum occurrences


Keywords


gypsum; dolomite; lacustrine; Sivrihisar; Eskişehir; Turkey.

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