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Hydrothermal alteration products in the vicinity of the Ahırözü kaolin deposits, Mihalıççık-Eskişehir,Turkey

Published online by Cambridge University Press:  12 July 2018

Işil Ömeroğlu Sayit ,
Asuman Günal Türkmenoğlu ,
Ş. Ali Sayin  and
Cengiz Demirci
Işil Ömeroğlu Sayit*
Affiliation:
Middle East Technical University, Department of Geological Engineering, Ankara, Turkey
Asuman Günal Türkmenoğlu
Affiliation:
Middle East Technical University, Department of Geological Engineering, Ankara, Turkey
Ş. Ali Sayin
Affiliation:
Aksaray University, Department of Geological Engineering, Aksaray, Turkey
Cengiz Demirci
Affiliation:
Alacer Gold Corp., Turkey
*
*E-mail: isilomeroglu@yahoo.com
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Abstract

The mineralogy, texture and composition of rocks associated with the kaolin deposits in the Ahırözü-Hamidiye-Üçbaşlı area, SE of Mihalıççık, Eskişehir, 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 (Th, °C), salinity, (wt.% NaCl) and melting temperature (Tm, °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°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°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 Y and enriched in Cs, U and Sr, and represent the products of epithermal hydrothermal alteration of granitic intrusions emplaced in a volcanic arc.

Keywords

hydrothermal alterationkaolin depositargillic alterationpropylitic alterationepithermal depositAhırözüTurkey
Type
Article
Information
Clay Minerals , Volume 53 , Issue 2 , June 2018 , pp. 289 - 303
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

This paper was originally presented during the 5th International Mediterranean Clay Meeting, 2016

Guest Associate Editor: H. Akgün

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