AN IMPORTANT CHABASITE OCCURRENCE IN CENTRAL ANATOLIA AND ITS MINERALOGICAL FEATURES

Year 2007, Volume: 135 Issue: 135, 31 - 44, 30.12.2007

M. Bahadır Şahin

Abstract

The Lower - Middle Miocene Aktepe Formation cropping out to the south of Ankara (Central
Anatolia) is comprised of volcano - sedimentary lacustrine deposits. In the formation mainly three zeolitic tuffaceous
layers including dominant chabasite were determined. Based on the data obtained from XRD and SEM
investigations, it was determined that the authigenic zeolite minerals are chabasite, erionite and clinoptilolite, and
minor smectite in some samples. Where the clinoptilolite is dominant, at a location, it has been observed that Kfeldspar
enters into the mineralogical composition. The main mineral assemblages in zeolitic tuffs are determined
as "chabasite + erionite + clinoptilolite" and "chabasite + erionite + clinoptilolite + K-feldspar".The first data
obtained points out that the Aktepe Formation has deposited in a saline - alkaline lacustrine environment. It can
be said that, the zeolitic tuff occurrences in which chabasite is abundantly present, has economical potential. 

Keywords

Chabasite, zeolite, Central Anatolia, Lower - Middle Miocene, volcano sedimentary rocks

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