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Title: Origin and evolution of halite based on stable isotopes (delta Cl-37, delta Br-81, delta B-11 and delta Li-7) and trace elements in Tuz Golu Basin, Turkey
Authors: Ünal Ercan, Hatice
Çelik Karakaya, Muazzez
Bozdağ, Ayla
Karakaya, Necati
Delikan, Arif
Keywords: Delta Br-81
Delta Cl-37
Delta Li-7
Delta B-11 Isotopes
Tuz Golu Basin
Cl-Br Systematics
Fluid Inclusions
Central Anatolia
Chlorine Isotopes
Early Miocene
Pore Waters
Issue Date: 2019
Abstract: The Tuz Golu basin located in Central Anatolia contains ancient (Miocene) and recent evaporite deposits. The aim of this study is to determine the origin and evolution of the ancient halite deposits in the basin, particularly whether there is a marine origin. For this purpose, the mineralogical, geochemical and isotopic properties of halite samples taken from three different drillings at the southern part of the Tuz Golu basin were determined. Halite samples in the Tuz Golu basin are characterized by Cl (60.20-61.00%), Na (39.00-39.40%) and Br (5637 ppm) contents. The Cl-, Br-, Ca, Mg2+, SO42-, and K+ values and Cl/Br (948-86428) ratios indicated that during the formation of the ancient halites in the Tuz Golu basin, the mixture of solutions had different compositions/origins and that the dissolution, recrystallization and dedolomitization mechanisms were effective. The delta Br-81,delta Cl-37, delta Li-7 and delta B-11 isotopic compositions of the pure halites range from - 0.06 to 0.82, - 0.80 to 1.28, - 0.70 to 30.60 and -14.70 to 11.60, respectively. The low delta Cl-37 (from - 0.06 to 0.06 parts per thousand), low delta Br-81 (from 0.03 to 0.95 parts per thousand), high delta B-11 (from -6.40-11.60 parts per thousand) and high delta Li-7 (from 26.00 to 30.60 parts per thousand) values clearly indicate that the brine involved in the formation of the halites of the Tuz Golu basin was largely derived from seawater during the Mid-Miocene Climatic Optimum (MMCO) period. Additionally, the Cl-, Br-, Ca2+, Mg2+, and SO42- contents, as well as the intermediate delta Br-81 (0.34-0.95 parts per thousand) values of the Tuz Golu samples, indicated that the origin of the ancient halites in the basin is not only a marine composition but also a mixture of solutions having different compositions, ratios or origins (e.g., seawater or saline water and groundwater/fresh water).
ISSN: 0883-2927
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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