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Genesis of the Yarikçi Hydrothermal Clay Deposit Within the Mesozoic Metamorphic Units, Mihaliççik, Eskişehir, Turkey

Published online by Cambridge University Press:  01 January 2024

Selahattİn Kadİr Open the ORCID record for Selahattİn Kadİr [Opens in a new window] ,
Hülya Erkoyun  and
Tacİt Külah
Selahattİn Kadİr*
Affiliation:
Department of Geological Engineering, Eskişehir Osmangazi University, TR-26480, Eskişehir, Turkey
Hülya Erkoyun
Affiliation:
Department of Geological Engineering, Eskişehir Osmangazi University, TR-26480, Eskişehir, Turkey
Tacİt Külah
Affiliation:
Department of Geological Engineering, Kütahya Dumlupınar University, TR-43100, Kütahya, Turkey
*
*E-mail address of corresponding author: skadir.icc@gmail.com
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Abstract

Hydrothermal alteration led to development of the Yarıkçı clay deposit within the Mesozoic chlorite-, muscovite-, chlorite-muscovite-schist, and garnet-graphite phyllite units along NW–SE- and N–S-trending faults in Mihalıççık in western central Anatolia. The geological, mineralogical, and geochemical characteristics and genesis of this economically important clay deposit have not been examined in detail previously. The present study has attempted to fill this gap. Green smectitic and cream kaolinitic claystones are abundant with smaller amounts of gray illite, dark brown Fe oxides, and silica phases occurring as stockwork/fracture infill and stain/coating. These units are covered by a dark, hard, sharp-edged, and thick silica cap. Metamorphic units exhibit cataclastic texture due to tectonic activities. Muscovite is mostly degraded to kaolinite, and feldspars show sericitization and argillization. Kaolinite typically has a platy form with irregular margins and locally sub-rounded, book-like texture suggesting hydrolysis during the hydrothermal injections. The association of Fe oxides, cristobalite/tridymite/quartz, gypsum/anhydrite, and jarosite are indicative of intense hydrothermal activities and development of kaolinite under acidic geochemical conditions. The local enrichment of SiO2, Fe2O3, S, Cu, and Au also supports this suggestion. The leaching of Sr, Rb, Ba, and Zr, and the slight increase in LREE/MREE+HREE ratios together with the negative Eu and Ce anomalies suggest the selective dissolution of muscovite, garnet, feldspar, and pyroxene by the hydrothermal fluids. Thus, abundant claystones of smectite and kaolinite were formed via the increase in Al+Fe+Mg/Si and Al±Fe/Si ratios in the alkaline and acidic environment, respectively, under the tectonic control of hydrothermal activity as seen in the alteration of chlorite, muscovite, and feldspar in metamorphic units.

Keywords

EskişehirGenesisGeochemistryHydrothermal clay depositMineralogyMesozoic metamorphismTurkey
Type
Article
Information
Clays and Clay Minerals , Volume 68 , Issue 6 , December 2020 , pp. 553 - 579
Copyright
Copyright © Clay Minerals Society 2021

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