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    GEOLOGY AND MINERALOGY OF THE DOGANHISAR CLAY BEDS (CENTRAL ANATOLIA, TURKEY)
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Aksoy, Rahmi; Ince, Ismail; Bozdag, Ali; Huseyinca, M. Yavuz
    The geology and the mineralogy of the clay beds (Doganhisar clays) located southeast of Doganhisar (central Anatolia, Turkey) were studied, Rock units found in and adjacent to the Doganhisar clay beds include metamorphic rocks of pre-Triassic age of the Sultandaglari Massif, the Miocene Ayaslar Formation and the Pliocene Doganhisar Formation as well as alluvium The Lower (?)-Middle Cambrian-Lower Ordovician Caltepe Formation forming the base of the metamorphic rocks is composed of recrystallized limestone and dolomite. The upper Cambrian-Lower Ordovician Sultandede Formation conformably overlies the Caltepe Formation. The Middle-Upper Devonian Engilli Formation unconformably overlies the Sultandede Formation and consists predominantly of metaquartzite. It is conformably overlain by the Lower-Middle Carboniferous Kirazli Formation. It is vertically and laterally graded upward in to the Lower-Middle Carboniferous Harlak Formation. Neogene cover units consist of alluvial fan and lacustrine deposits. Metamorphic rocks have undergone regional metamorphism under low grade metamorphic condition and three phases of deformation during the Alpine orogeny. X-ray diffraction (XRD) and chemical analysis were used to study the clay mineralogy. Illite and kaolinite, with lesser amount of chlorite dominate the mineral composition.
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    GEOTECHNICAL PROPERTIES OF DOGANHISAR CLAYS CENTRAL ANATOLIA, TURKEY
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Ince, Ismail; Aksoy, Rahmi; Huseyinca, M. Yavuz
    This study discusses the results of geotechnical investigation carried out on Doganhisar clays in Central Anatolia, Turkey, originated from the weathering of metamorphic basement rocks. The clays of this location constitute an interesting area for researchers due to their geology, thickness, and very high overconsolidation values. In the area, clay deposits are unusually thick, varying from 10 m to 60 in in thickness. For this study, geotechnical investigations were carried out with laboratory tests on disturbed and undisturbed samples from seven sites. Geotechnical study indicates that the clays have natural water content range of 6% to 21%, liquid limit range of 27% to 47%, plastic limit range of 13% to 23%, and plasticity index range of 12% to 30%. Doganhisar clays have a medium to high plasticity. Shrinkage limit and specific gravity of clays vary between 10-19% and 2.6-2.8, respectively. The internal friction angle and cohesion vary between 9 degrees-29 degrees and 103-259 kN/m(2), respectively. The consolidation tests show that the swelling pressures and the swelling percents are between 4-10 kN/m(2) and 0.84%, respectively. The composition and geotechnical properties of Doganhisar clays indicate that they are potentially suitable for ceramic and refractory production.
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    NEOTECTONIC FEATURES OF THE CAVUSCUGOL GRABEN (CENTRAL ANATOLIA, TURKEY)
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Huseyinca, M. Yavuz; Aksoy, Rahmi; Ince, Ismail
    The aim of this study is to elucidate the neotectonic characteristics of the Cavuscugol graben. The Cavuscugol graben is 3-8 km wide 28 km long. It is a N-S trending actively evolving extensional structure containing infills of fluvial sediments of Pliocene-Quaternary age. The Cavuscugol graben is bounded on both sides by oblique-slip normal faults. These faults trend N-S and named as Ilgin Fault on the west and Tekeler Fault on the east. The footwall side of the faults are composed of the pre-Late Cretaceous metamorphic rocks and the Miocene-Pliocene fluviolacustrine sediments. Field studies indicated that the graben has been developed as a result of E-W extension since Upper Pliocene.