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四川盆地下、中三叠统硬石膏和盐卤水广布，通过对采集于不同地段不同层位各具代表性的硬石膏、石膏和盐卤水的２４４件样品的分析，可见其同层位硫同位素组成稳定，δ３４Ｓ自下而上具阶梯状递减轻化的趋势，与已知全球海相三叠系硫同位素组成有明显差异。这种硫同位素分布规律对地层划分和对比、蒸发岩形成环境的判断、研究卤水产层和成因、掌握蒸发岩咸化发展方向及预测找钾工作等的意义不容忽视。
The middle Triassic anhydrite and salt brine are widely distributed in the Sichuan Basin. Based on the analysis of 244 samples of representative anhydrides, gypsums and bittern at different layers in different locations, we can see that the same layer of sulfur Isotope composition is stable, δ34S from bottom to top with a gradual decrease of the trend of light, and the known global Triassic marine sulfur isotopic composition were significantly different. The distribution of sulfur isotopes can not be ignored in the stratigraphic division and comparison, the judgment of formation environment of evaporites, the study on the formation and origin of brine, the development direction of evaporites and the prediction of potassium finding.