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The relationship between zeolite (heulandite-clinoptilolite) content and the ammonium-exchange capacity of pyroclastic rocks in Gördes, Turkey

Published online by Cambridge University Press:  09 July 2018

F. Esenli  and
A. Sirkecioğlu
F. Esenli*
Affiliation:
İstanbul Technical University, Department of Geology Engineering, Maslak 34469, Istanbul, Turkey
A. Sirkecioğlu
Affiliation:
Istanbul Technical University, Department of Chemical Engineering, Maslak 34469, Istanbul, Turkey
*
E-mail: esenlif@itu.edu.tr
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Abstract

Diagenetic alteration in two tuff horizons (the lower and upper tuff units) in the GoÈrdes region of Turkey led to the formation of mainly heulandite-clinoptilolite-type zeolites and also clay and silica minerals and K-feldspar. Possible variations in the climate and geological environment followed by variations in the hydrological system and the composition of the Miocene lake water and groundwater at that time resulted in the mineralogical facies. The lower tuffs are unaltered or slightly altered in the northern part and are more altered, particularly to zeolite (clinoptilolite) in the southern part of the study area. Heulandite and K-feldspar are mainly authigenic minerals in the upper tuff unit. The ammonium-exchange capacities of the 16 samples were investigated to understand the effects of the mineralogical composition on their ion-exchange capacities, which vary in the range 0.19-2.00 mEq/g. It is observed that the ion-exchange capacities are strongly dependent on the zeolite contents of the rocks. The correlation coefficient of this linear relation is 0.86. The most significant increase in ammonium-exchange capacity (from 0.2 to ~1.0 mEq/g) was observed when the zeolite contents increased from 0 to 30 wt.%. The second increase in exchange capacity was observed for samples containing >80 wt.% zeolite. Although there is no significant effect from the other authigenic minerals, smectite has a positive effect, and K-feldspar and opal-CT have almost no effect on the ion exchange capacities.

Keywords

ammonium-exchange capacityclinoptiloliteGördesTurkeyheulanditezeolite
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 4 , December 2005 , pp. 557 - 564
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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