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Full-Text Articles in Physical Sciences and Mathematics
Genesis Of Sedimentary- And Vein-Type Magnesite Deposits At Kop Mountain, Ne Turkey, Selahatti̇n Kadi̇r, Hasan Kolayli, Muhsi̇n Eren
Genesis Of Sedimentary- And Vein-Type Magnesite Deposits At Kop Mountain, Ne Turkey, Selahatti̇n Kadi̇r, Hasan Kolayli, Muhsi̇n Eren
Turkish Journal of Earth Sciences
Sedimentary- and vein-type magnesites were deposited within and on ultramafic rocks of the Kop Mountain region in Bayburt province. In the field, magnesites are exposed along NE-SW trending normal faults and in fractures in the ultramafic rocks. Petrographic studies reveal that magnesite is predominantly micrite, but also occurs as microsparite formed by recrystallization of micrite. The ultramafic rocks hosting the magnesites consist of serpentinized olivine, hypersthene and diopside. Ni, Co and Ti contents of magnesites suggest precipitation from percolating water through the serpentinized ultramafic rocks. The sedimentary- and vein-type magnesites have different \delta^{18}O and \delta^{13}C values, characterizing formation under different …
Genesis Of The Hydrothermal Karaçayır Kaolinite Deposit In Miocene Volcanics And Palaeozoic Metamorphic Rocks Of The Uşak-Güre Basin, Western Turkey, Selahatti̇n Kadi̇r, Hülya Erkoyun
Genesis Of The Hydrothermal Karaçayır Kaolinite Deposit In Miocene Volcanics And Palaeozoic Metamorphic Rocks Of The Uşak-Güre Basin, Western Turkey, Selahatti̇n Kadi̇r, Hülya Erkoyun
Turkish Journal of Earth Sciences
The Karaçayır kaolinite deposit, situated in the Uşak-Güre basin of western Turkey, is hosted by rhyolite and andesite of the Miocene Dikendere volcanics, and by muscovite schist, glaucophane schist, talc schist and chlorite schist of the Palaeozoic Eşme Formation. The association of kaolinization with silicification and Fe-oxidation, and the presence of pyrite, chalcopyrite and gypsum, suggest that hydrothermal alteration processes in the volcanics and schists were controlled by faults. Thus, prevalent kaolinite is associated with quartz, smectite, illite and opal-CT in the centre of the deposit, with relative increases in smectite, illite, chlorite and Fe (oxyhydr)oxide phases outwards and upwards. …
Mineralogical And Physicochemical Properties Of Talc From Emirdağ, Afyonkarahisar, Turkey, Bahri̇ Ersoy, Sedef Di̇kmen, Ahmet Yildiz, Remzi̇ Gören, Ömer Eli̇tok
Mineralogical And Physicochemical Properties Of Talc From Emirdağ, Afyonkarahisar, Turkey, Bahri̇ Ersoy, Sedef Di̇kmen, Ahmet Yildiz, Remzi̇ Gören, Ömer Eli̇tok
Turkish Journal of Earth Sciences
Lens-shaped talc deposits related to Mesozoic gabbroic rocks are exposed in an area of 2 km^2, about 80 km northwest of Afyonkarahisar (western Anatolia). Different alteration zones in talc deposits were determined depending on differences related to the texture and color of the host rock. In order to determine mineralogical, geochemical, and physicochemical features of the Emirdağ talc deposits, X-ray diffractometer, scanning electron microscope (SEM), FT-IR and Mössbauer spectroscopy, differential thermogravimetric analyses, BET-specific surface area, color, water soluble substance, acid-soluble carbonate, and acid-soluble iron tests were performed on the samples collected from different alteration zones in the lateral direction. Four …