Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/781
Title: Elemental and C, O and Mg isotope geochemistry of middle-late Miocene carbonates from the Tuz Golu Basin (Central Anatolia, Turkey): Evidence for Mediterranean incursions
Authors: Çelik Karakaya, Muazzez
Bozdağ, Ayla
Karakaya, Necati
Keywords: Central Anatolia
Dolomite
Evaporites
C, O And Mg Isotopes
Magnesite
Tuz Golu Basin
Magnesium-Isotope
Messinian Evaporites
Halite Association
Stable-Isotopes
Southern Margin
Mut Basin
Evolution
Plateau
Fractionation
Pliocene
Issue Date: 2021
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Abstract: The Tuz Golu basin, the largest of the Central Anatolian Neogene basins, is a NW-SE trending fault-controlled depression and includes many subbasins, such as the Ere.gli, Ulukisla and Bor subbasins. In the basin, economically important evaporite deposits consisting mostly of halite, gypsum/anhydrite, glauberite and carbonates formed in the middle-late Miocene. The mineralogical and chemical properties and C, O and Mg isotopic compositions of the carbonate minerals that precipitated simultaneously with the other evaporite minerals were investigated using samples from boreholes to determine the precipitation conditions and paleoenvironment of the deposits. The lack of covariance between the delta C-13 and delta O-18 values of the samples and the wide range of isotopic compositional variations indicate a basin that was hydrologically open to some degree. In addition, the lack of correlations between delta O-18 values and MgO/(MgO + CaO), Mg/Ca and Sr/Ca ratios and the wide range of variations in both delta C-13 and delta O-18 values indicate that the carbonate minerals precipitated in a lagoonal environment where seawater incursions occurred through transgressions. The delta O-18 values of the dolomite samples are higher than those of Messinian normal-salinity seawater dolomites and therefore require contributions from evaporative fluids. Additionally, the isotopic data indicate extreme fluctuations in temperature and the inflow-evaporation balance during carbonate precipitation and indicate that the evaporite minerals may have precipitated from the evaporation of seawater trapped within the basin during and after uplift of the region. The Mg isotopic compositions of magnesium-rich carbonates are partially heterogeneous, and the delta Mg-26 values are higher than the delta Mg-25 values. Some of the delta Mg-26 values are close to the delta Mg-26 values of global seawater (-0.82%) but higher than the global mean delta Mg-26 value of river water (-1.09%). The delta Mg-26 values are partially within the range of marine sediments (-3.65 to +0.52%), suggesting seawater contributions to carbonate precipitation.
URI: https://doi.org/10.1016/j.jseaes.2021.104946
https://hdl.handle.net/20.500.13091/781
ISSN: 1367-9120
1878-5786
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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