GEOLOGY AND CONDITIONS OF FORMATION OF THE ZEOLITE-BEARING DEPOSITS SOUTHEAST OF ANKARA (CENTRAL TURKEY)

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dc.contributor.authorKarakaya, Muazzez Celik
dc.contributor.authorKarakaya, Necati
dc.contributor.authorYavuz, Fuat
dc.date.accessioned2020-03-26T19:06:03Z
dc.date.available2020-03-26T19:06:03Z
dc.date.issued2015
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractThe pyroclastic sediments studied here contained varied amounts of zeolite and were formed in the saline alkaline Tuzgolii Basin following the alteration of dacitic volcanic materials during the Early to Late Miocene. The present study focused on the geological-geochemical properties of the zeolites and describes their formation. Mineralogical and chemical compositions were determined by X-ray diffraction, scanning electron microscopy, optical microscopy, and inductively coupled plasma mass spectrometry. Results indicated that the zeolitic tuffs consisted mainly of heulandite/clinoptilolite (Hul/Cpt), chabazite, erionite, and analcime associated with smectite. Smectite, calcite, and dolomite are abundant in the clay and carbonate layers which alternate with the zeolitic tuffs. K-feldspar, gypsum, and hexahydrite (MgSO4 center dot 6H(2)O) were also found in some altered tuffs and clay-marl layers as accessory minerals. The zeolite and other authigenic minerals showed weak stratigraphic zonation. Some vitric tuff layers contained no zeolite minerals and others were found to consist of almost pure Hul/Cpt and chabazite layers with economic potential. The rare earth elements (REE), large ion lithophile elements (LILE), and high-field strength elements (HFSE) in the Hul/Cpt-rich tuffs and vitric tuffs were enriched or depleted relative to the precursor rock, while many major elements were slightly or significantly depleted in all zeolitic tuffs. The amounts of REE in the chabazite- and erionite-rich tuffs were generally smaller than those in the precursor rock. The middle and heavy REE (MREE and HREE, respectively) were abundant in the Hull Cpt-rich tuffs, tuffs, and smectitic bentonites. Chondrite-normalized REE values of the sample groups are characterized by sub-parallel patterns with enrichment in LREE relative to HREE. The mineral assemblages and geological setting indicated that zeolite diagenesis occurred in a saline-alkaline basin. The delta O-18 and delta D compositions of the Hul/Cpt, chabazite, and smectite indicated that the minerals formed at low to moderate temperatures and that some of the zeolitization occurred due to diagenetic alteration under closed-system conditions that varied according to the nature of the basin and with the composition and physical properties of the volcanic materials.en_US
dc.description.sponsorshipTUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [109Y301]; Selcuk UniversitySelcuk University [BAP 10401052]en_US
dc.description.sponsorshipThe present investigation was made possible through financial support by the TUBITAK 109Y301 project and the Selcuk University Scientific Research projects support program BAP 10401052. The authors are grateful to Prof. Dr. O. Isik Ece and two anonymous reviewers for their constructive comments which greatly improved the quality of the manuscript. The authors express their warmest thanks to Acting Editor-in-Chief Michael A. Velbel and Associate Editor Warren D. Huff for their helpful suggestions, which greatly improved the manuscript.en_US
dc.identifier.doi10.1346/CCMN.2015.0630202en_US
dc.identifier.endpage109en_US
dc.identifier.issn0009-8604en_US
dc.identifier.issn1552-8367en_US
dc.identifier.issue01.02.2020en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage85en_US
dc.identifier.urihttps://dx.doi.org/10.1346/CCMN.2015.0630202
dc.identifier.urihttps://hdl.handle.net/20.500.12395/32194
dc.identifier.volume63en_US
dc.identifier.wosWOS:000362797900008en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherCLAY MINERALS SOCen_US
dc.relation.ispartofCLAYS AND CLAY MINERALSen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectAnalcimeen_US
dc.subjectAnkaraen_US
dc.subjectChabaziteen_US
dc.subjectClinoptiloliteen_US
dc.subjectErioniteen_US
dc.subjectHeulanditeen_US
dc.subjectSmectiteen_US
dc.subjectTurkeyen_US
dc.subjectZeoliteen_US
dc.titleGEOLOGY AND CONDITIONS OF FORMATION OF THE ZEOLITE-BEARING DEPOSITS SOUTHEAST OF ANKARA (CENTRAL TURKEY)en_US
dc.typeArticleen_US

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