Mineralogy, geochemistry and genesis of the modern sediments of Seyfe Lake, Kirsehir, central Anatolia, Turkey

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dc.authorid0000-0001-7594-1153
dc.contributor.authorOnalgil, Nergis
dc.contributor.authorKadir, Selahattin
dc.contributor.authorKulah, Tacit
dc.contributor.authorEren, Muhsin
dc.contributor.authorGurel, Ali
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2015
dc.departmentNiğde ÖHÜ
dc.description.abstractSeyfe Lake (Kirsehir, Turkey) is located within a depression zone extending along a NW-SE-trending fault in central Anatolia. Evaporite and carbonate sediments occur at the bottom of the lake which is fed by high-sulfate spring and well waters circulating N-S through salt domes. The recent sediments of Seyfe Lake are deposited in delta, backshore, beach, mud-flat and shallow lake environments. In the mud-flat environment, calcite, gypsum, halite, and thenardite are associated with fine-grained detrital sediments. Sediments from the margin to the lake center are distributed as calcite, gypsum and halite thenardite, yielding an annular distribution pattern. An increase in Na2O, SO3, and S, and a decrease in CaO toward the lake center are due to sediment distribution. On the other hand, a positive correlation of SiO2 with MgO, K2O, Na2O, Al2O3, and Fe2O3 + TiO2 is attributed to the presence of smectite, illite and feldspar. In addition, a positive correlation of Sr and Ba with CaO is related to the amount of gypsum in the sediments. Strontium is associated with in situ gypsum crystals; it increases in the intermediate and central zones of the lake as a result of a relative increase in salinity toward the lake center. The association of Sr with gypsum in the sediments suggests that Ca and Sr were derived from Sr-bearing evaporites and their carbonate host rocks, which were the likely aquifers for the brine. The S- and O-isotopic compositions of sulfate crystals range from +19.1 parts per thousand to +21.7 parts per thousand and from +16.9 parts per thousand to +20.9 parts per thousand SMOW, respectively, suggesting precipitation in a closed lake system. A relative increase of oxygen and sulfur isotope ratios toward the lake center suggests dissolution of gypsum in the host rock, with contributions from circulating groundwater and sulfate reduction (possibly by bacterial reduction). Sr-87/Sr-86 isotope ratios range from 0.707286 to 0.707879, suggesting a non-marine Oligo-Pliocene evaporitic host rock source for precipitation in Seyfe Lake. The concentration of Sr- and S-isotope ratios in the gypsum crystals indicates formation by precipitation/recrystallization from brine rather than from seawater. (C) 2014 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipScientific Research Projects Fund of Eskisehir Osmangazi University [201015030]
dc.description.sponsorshipThis study was financially supported by the Scientific Research Projects Fund of Eskisehir Osmangazi University in the framework of Project 201015030, and it comprises a part of the first author's MSc thesis. This study was conducted based on a special permission from the Ministry of Forestry and Water Affairs of Turkey. The authors are much indebted to Professor Cahit Helvaci. (Dokuz Eylul University, Turkey) 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 Professor Patrick G. Eriksson (University of Pretoria, South Africa) for his insightful editorial comments and suggestions.
dc.identifier.doi10.1016/j.jafrearsci.2014.10.020
dc.identifier.endpage130
dc.identifier.issn1464-343X
dc.identifier.issn1879-1956
dc.identifier.scopus2-s2.0-84916898060
dc.identifier.scopusqualityQ2
dc.identifier.startpage116
dc.identifier.urihttps://dx.doi.org/10.1016/j.jafrearsci.2014.10.020
dc.identifier.urihttps://hdl.handle.net/11480/3980
dc.identifier.volume102
dc.identifier.wosWOS:000348621500010
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.ispartofJOURNAL OF AFRICAN EARTH SCIENCES
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCalcite
dc.subjectGypsum
dc.subjectHalite +/- thenardite
dc.subjectGeochemistry
dc.subjectMineralogy
dc.subjectSeyfe Lake
dc.titleMineralogy, geochemistry and genesis of the modern sediments of Seyfe Lake, Kirsehir, central Anatolia, Turkey
dc.typeArticle

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