The Tuz Gölü basin, the largest of the Central Anatolian Neogene basins, is a NW-SE trending fault-controlled depression and includes many subbasins, such as the Ereğli, Ulukışla 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 δ¹³C and δ¹⁸O 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 δ¹⁸O values and MgO/(MgO + CaO), Mg/Ca and Sr/Ca ratios and the wide range of variations in both δ¹³C and δ¹⁸O values indicate that the carbonate minerals precipitated in a lagoonal environment where seawater incursions occurred through transgressions. The δ¹⁸O 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 δ²⁶Mg values are higher than the δ²⁵Mg values. Some of the δ²⁶Mg values are close to the δ²⁶Mg values of global seawater (–0.82‰) but higher than the global mean δ²⁶Mg value of river water (–1.09‰). The δ²⁶Mg values are partially within the range of marine sediments (–3.65 to +0.52‰), suggesting seawater contributions to carbonate precipitation.

Tuz Gölü 盆地是安纳托利亚中部新近系中最大的盆地，是一个 NW-SE 向断层控制的凹陷，包括许多子盆地，如 Ereğli、Ulukışla 和 Bor 子盆地。在盆地中，主要由岩盐、石膏/硬石膏、芒硝和碳酸盐组成的具有重要经济意义的蒸发岩矿床形成于中晚期中新世。使用钻孔样品研究了与其他蒸发岩矿物同时沉淀的碳酸盐矿物的矿物学和化学性质以及 C、O 和 Mg 同位素组成，以确定沉积物的沉淀条件和古环境。

样品的 δ ¹³ C 和 δ ¹⁸ O 值之间缺乏协方差以及广泛的同位素组成变化表明盆地在一定程度上具有水文开放性。此外，δ ¹⁸ O 值与 MgO/(MgO + CaO)、Mg/Ca 和 Sr/Ca 比值之间缺乏相关性以及 δ ¹³ C 和 δ ¹⁸ O 值的广泛变化表明碳酸盐矿物在通过海侵发生海水入侵的泻湖环境中沉淀。δ ¹⁸白云岩样品的 O 值高于墨西拿正常盐度海水白云岩的 O 值，因此需要蒸发流体的贡献。此外，同位素数据表明碳酸盐沉淀过程中温度和流入蒸发平衡的极端波动，并表明蒸发岩矿物可能是在该地区隆起期间和之后被困在盆地内的海水蒸发中沉淀出来的。

富镁碳酸盐的Mg同位素组成部分不均匀，δ ²⁶ Mg值高于δ ²⁵ Mg值。一些 δ ²⁶ Mg 值接近全球海水的 δ ²⁶ Mg 值 (–0.82‰)，但高于全球平均河水δ ²⁶ Mg 值 (–1.09‰)。δ ²⁶ Mg 值部分在海洋沉积物的范围内（–3.65 至 +0.52‰），表明海水对碳酸盐沉淀的贡献。