Ömero?lu Sayit, IşılGünal Türkmeno?lu, AsumanSayın, Şıh AliDemirci, Cengiz13.07.20192019-07-1613.07.20192019-07-1620180009-85581471-8030https://doi.org/10.1180/clm.2018.19https://hdl.handle.net/20.500.12451/4699The mineralogy, texture and composition of rocks associated with the kaolin deposits in the Ahirozu-Hamidiye-Ucbasli area, SE of Mihaliccik, Eskisehir, Turkey, were investigated. In the study area, Triassic, blue-green schists and serpentinized ultramafic rocks are exposed. Kaolinization occurs at the contact between a Triassic granitic intrusion and metamorphic rocks. Textural and mineralogical characteristics were identified by X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) analyses. The effects of hydrothermal alteration on the whole-rock chemical composition were determined by inductively coupled plasma mass spectrometry (ICP-MS) analysis. Homogenization temperature (T-h, degrees C), salinity, (wt.% NaCl) and melting temperature (T-m, degrees C) were detected by fluid-inclusion analyses. The argillic alteration zone (Zone A) includes kaolinite, smectite, natroalunite and accessory pyrite, hematite and goethite. This paragenesis corresponds to a low-intermediate argillic alteration caused by fluids having neutral to acidic pH, at a temperature of <200 degrees C. The propylitic alteration zone (Zone B) is characterized by epidote, chlorite, illite and pyrite and was caused by fluids with a neutral pH and a temperature of >250 degrees C. The rocks in Zone C are mainly silicified and represent sinter formation in the study area. The rocks in the kaolin deposit are depleted in Rb, Pb and Yand enriched in Cs, U and Sr, and represent the products of epithermal hydrothermal alteration of granitic intrusions emplaced in a volcanic arc.eninfo:eu-repo/semantics/closedAccesshydrothermal AlterationKaolin DepositArgillic AlterationPropylitic AlterationEpithermal DepositAhirozuTurkeyArticle53228930310.1180/clm.2018.19Q2WOS:000451796400012N/A