Geochemistry of the Zeolite-rich Miocene Pyroclastic Rocks from the Gördes, Demirci and Şaphane Regions, West Anatolia, Turkey

Esenli Fahri Esenli, Selahattin Kadir*, Bala Ekinci Şans

*Bu çalışma için yazışmadan sorumlu yazar

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8 Atıf (Scopus)

Özet

Abstract: The western Anatolian Miocene volcano-sedimentary basins in the Gördes, Demirci and Şaphane regions host abundant heulandite/clinoptilolite (hul/cpt) bearing widespread zeolitized pyroclastic rocks. Lithostratigraphy of these zeolitic pyroclastic levels show comparable association. Petrography and geochemistry of all the samples show mainly rhyolithic and rhyodacitic character and ash size vitric tuffs. Polarized microscopy and X-ray diffraction determinations of the samples show composition of 55–95 wt % hul/cpt and accessory of smectite, illite/mica, opal–CT, quartz, K–feldspar, plagioclase and opaque minerals. Geochemical results obtained from the studied samples represent hul/cpt–rich facieses formed under the moderate alkaline conditions in these pyroclastic units. Correlation of geochemical results and concentration of hul/cpt in these pyroclastic rocks gives some chemical data on zeolitization process and on adsorption and ion-exchange character of hul/cpt type of zeolites. Depleted and enriched elements by zeolitization have similar ionic radii in general. Ca and H2O clearly increased, Si, Na and Si/Al ratio decreased in hul/cpt bearing Lower-Middle Miocene pyroclastic rocks of western Anatolia. Additionally, Sr, Nb, Th, Ni, Hf, Cs, Pb and Ta increased, and Zr, Co, W and most of the rare earth elements (REE) decreased in highly hul/cpt–rich pyroclastics.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)1158-1172
Sayfa sayısı15
DergiGeochemistry International
Hacim57
Basın numarası11
DOI'lar
Yayın durumuYayınlandı - 1 Kas 2019

Bibliyografik not

Publisher Copyright:
© 2019, Pleiades Publishing, Ltd.

Finansman

The authors are much indebted to Dr. S. Silantyev (Chief scientist of Vernadsky Institute of Russian Academy of Sciences) and Dr. Erik M. Galimov (Editor-in-Chief) for their extremely careful and constructive reviews and editorial comments that improved the quality of the paper significantly. Staff of the JAL laboratory of ?stanbul Technical University (Turkey) are thanked for assistance with the chemical analysis.

FinansörlerFinansör numarası
Chief scientist of Vernadsky Institute of Russian Academy of Sciences

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