Yenice-Saraycık (Demirci, Manisa) civarındaki zeolitik tüflerinin mineralojik ve petrografik incelenmesi

Bu çalışmada Demirci’nin (Manisa) güney batısında, Yenice-Saraycık civarındaki zeolitik tüflerin mineralojik ve petrografik özellikleri polarizan mikroskop ve X-ışını difraktometre (XRD) yöntemleri kullanılarak incelenmiştir. Mikroskobik gözlemler tüflerin camsı yapıda olduğunu, bununla birlikte az miktarda kristal ve kaya parçaları içerdiğini göstermektedir. Kristaller kuvars, plajiyoklaz, potasyum feldispat ve az miktarda biyotittir. Camsı özellik gösteren tüfler zeolitlere ve bazı diğer minerallere dönüşmüştür. Tüf örneklerinde yapılan XRD analizleri mikroskobik çalışmaları destekler niteliktedir. XRD çalışmaları tüflerin yaygın olarak klinoptilolit-höylandit gibi zeolit minerallerine dönüştüğünü göstermektedir. Smektit tüf örneklerinde zeolitlerle birlikte görülen en yaygın kil mineralidir. Bununla birlikte bazı tüf örneklerinin kaolinit ve/veya klorit içerdiği belirlenmiştir. Örneklerin birçoğunda kuvars, potasyum feldispat, plajiyoklaz ve mika/illit saptanmıştır. Saraycık bölgesi civarındaki zeolitik tüflerde kaolinit/klorit ile birlikte Opal-CT mineraline rastlanmıştır

Anahtar Kelimeler:

Zeolit, tüf, alterasyon, petrografi, mineraloji

Mineralogical and petrographic study of zeolitic tuffs from YeniceSaraycık (Demirci, Manisa), Turkey

The mineralogical and petrographic properties of the zeolitic tuffs around the Yenice-Saraycık, southwestern of Demirci (Manisa), were studied by using the polarizing microscope and powder X-ray diffraction (PXRD). Microscopic observations revealed that the tuffs are dominated volcanic glass however, contain small amounts of crystal and rock fragments. The crystal fragments consist mainly of quartz, k-feldspar, plagioclase and trace amounts of biotite. The glassy tuffs were altered to zeolites and other minerals. PXRD analysis of the tuff samples supports the microscopic observations. The PXRD results showed that the tuffs are mainly altered to zeolite minerals, clinoptilolite-heulandite. Smectite is the most common clay mineral coexisting with zeolites. However, kaolinite and/or chlorite were detected in some zeolitic tuff examined. Quartz, plagioclase, K-feldspar and mica/illite were determined in the most of samples. Additionally, opal-CT was found together with kaolinite/chlorite in zeolitic tuffs near the Saraycık area.

Keywords:

Zeolite, tuff, alteration, petrography, mineralogy,

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