Genesis of Late Miocene-Pliocene lacustrine palygorskite and calcretes from Kirsehir, central Anatolia, Turkey

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dc.authorid0000-0001-7594-1153
dc.contributor.authorKadir, S.
dc.contributor.authorEren, M.
dc.contributor.authorKulah, T.
dc.contributor.authorOnalgil, N.
dc.contributor.authorCesur, M.
dc.contributor.authorGurel, A.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2014
dc.departmentNiğde ÖHÜ
dc.description.abstractThis paper addresses the mineralogy, geochemistry, and genesis of palygorskite and associated calcretes in the Kirsehir region. In this area, the Quaternary calcretes are present within and/or on lacustrine mudstones of the Kizilirmak Formation (Late Miocene-Pliocene). The calcretes occur in the form of nodules, tubes, fracture-infills, and hard laminated crusts (hardpans). Calcrete samples are predominantly composed of calcite associated with smectite, quartz, feldspar, and minor palygorskite. The lacustrine mudstone samples consist mainly of smectite and palygorskite with minor calcite, quartz, feldspar, illite, kaolinite and amorphous material. Petrographic studies revealed that the calcrete samples are predominantly micrites that were partially converted to microsparites by recrystallization. Scanning and transmission electron microscopy images indicate that palygorskite fibres formed authigenically on and between calcite rhombs in the calcrete samples and at the edges of smectite flakes of host rocks adjacent to the calcretes. The oxygen and hydrogen stable isotope values of the calcite suggest that it precipitated from meteoric water under arid or seasonally arid climatic conditions. Calcite precipitation occurred in the vadose zone, as evidenced by desiccation cracks and vadose pisolites. The enrichment of Rb+Ba +/- Sr and Light Rare Earth Elements (LREE) relative to Heavy Rare Earth Elements (HREE) with a distinct negative Eu anomaly are responses to the fractionation of volcanogenic feldspar and hornblende under the influence of meteoric water. The palygorskite associated with calcretes was precipitated from alkaline water rich in Si, Al and Fe and low in Mg. The palygorskite precipitation occurred at increased temperatures, characterising the advanced stage of calcrete formation which lowers the Ca content in the soil water. The required chemical elements for palygorskite and calcite were most likely derived from the dissolution of smectitic clays, ignimbrites and carbonate minerals.
dc.description.sponsorshipScientific Research Projects Fund of Eskisehir Osmangazi University [201015030]
dc.description.sponsorshipThis study was supported financially by the Scientific Research Projects Fund of Eskisehir Osmangazi University in the framework of Project 201015030. The authors are much indebted to Professor Emilio Galan and an anonymous reviewer for their extremely careful and constructive reviews that significantly improved the quality of the paper. We are also extremely grateful to the editor for his insightful editorial comments and suggestions, and also for detailed reviews and suggestions on an earlier draft of the manuscript by Professor Warren D. Huff.
dc.identifier.doi10.1180/claymin.2014.049.3.09
dc.identifier.endpage494
dc.identifier.issn0009-8558
dc.identifier.issn1471-8030
dc.identifier.issue3
dc.identifier.scopus2-s2.0-84903998897
dc.identifier.scopusqualityQ3
dc.identifier.startpage473
dc.identifier.urihttps://dx.doi.org/10.1180/claymin.2014.049.3.09
dc.identifier.urihttps://hdl.handle.net/11480/4161
dc.identifier.volume49
dc.identifier.wosWOS:000342659400009
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherMINERALOGICAL SOC
dc.relation.ispartofCLAY MINERALS
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectpalygorskite
dc.subjectcalcrete
dc.subjectsmectite
dc.subjectmudstone
dc.subjectstable isotopes
dc.subjectTurkey
dc.titleGenesis of Late Miocene-Pliocene lacustrine palygorskite and calcretes from Kirsehir, central Anatolia, Turkey
dc.typeArticle

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