The conventional mechanism for dolomitization in evaporitic basins is by drawdown-related reflux of brines, but it seems that ascending brines were responsible in the case of basal Zechstein (Wuchiapingian) strata. Dolomite of basinal sections of the Zechstein Limestone in SW Poland show mostly fabric-destructive dolomitization and wide δ¹⁸O_VPDB and δ¹³C_VPDB ranges (−3.78 to 6.47‰ and −1.64 to +5.3‰ respectively). The maximum δ¹⁸O value reflects the temperature of dolomitizing fluid equal to approximately 38°C, if the δ¹⁸O of water = +4‰ is assumed. The ⁸⁷Sr/⁸⁶Sr ratios of the dolomite samples vary from 0.707924 to 0.711164 and are clearly enriched with respect to the contemporaneous seawater values. The basinal dolomites have originated owing to interaction of low-temperature brines from the underlying red beds and hypersaline brines originated during the Zechstein evaporite deposition. The conventional concept connecting the highly radiogenic strontium values recorded in dolomites with the overlying formations, and thus implying the reflux mechanism of dolomitization, should be re-evaluated.

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波兰西南部上二叠纪盆地白云岩的成因：上升盐水的影响

蒸发盆地中白云石化的常规机制是与下降相关的卤水回流，但在泽希施泰因（五甲坪阶）基底地层的情况下，上升的卤水似乎是原因。波兰西南部 Zechstein 石灰岩盆地部分的白云岩主要显示出对织物的破坏性白云石化和广泛的 δ ¹⁸ O _{V PDB}和 δ ¹³ C _VPDB范围（分别为 -3.78 至 6.47‰ 和 -1.64 至 +5.3‰）。如果假设水的 δ ¹⁸ O = +4‰ ，则最大 δ ¹⁸ O 值反映了白云石化流体的温度约为 38°C 。在⁸⁷ SR / ⁸⁶白云岩样品的 Sr 比率从 0.707924 到 0.711164 不等，并且相对于同期海水值明显富集。盆地白云岩起源于下伏红层的低温盐水和 Zechstein 蒸发岩沉积期间起源的高盐度盐水的相互作用。将白云岩中记录的高放射性锶值与上覆地层联系起来的传统概念，从而暗示白云石化的回流机制，应该重新评估。