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根据国内外许多钾盐矿床大量样品测定的结果：通常石盐（岩）的37Cl／35Cl比值和δ37Cl（％）值高于钾石盐（岩）；钾石盐高于光卤石（岩）。例如：西班牙Catalonia盆地钾盐矿床，其石盐岩为0．31958—0．31941和＋1．002─＋0．470‰，钾石盐岩为0．31913和─0．407‰，光卤石岩为0．31887和─1．221‰，等等。这说明了这些蒸发岩是在水体浓缩的不同阶段形成的，是氯同位素分馏作用长期不断进行的结果。其氯同位素组成与Br、K和Mg含量有着密切关系。困而在我国找钾过程中，可将氯同位素组成及Br、K、Mg含量结合起来作为找钾标志考虑。
According to the results of a large number of samples from many domestic and international potash deposits, the 37Cl / 35Cl ratio and δ37Cl (%) value of the rock salt are generally higher than that of the karst rock (salt); the potassium salt is higher than the carnallite (rock). For example, the potash deposits in the Catalonia Basin in Spain have rock salt rocks of 0.31958-0.31941 and + 1.002- + 0.470 ‰, potash rock salts of 0.31913 and 0.407 ‰, 0.31887 and -1.221 ‰, and so on. This shows that these evaporites are formed at different stages of the water body concentration and are the result of the long-term continuous action of the chlorine isotope fractionation. Its chlorine isotope composition and Br, K and Mg content are closely related. Sleepy and in our country to find potassium process, the composition of chlorine isotopes and Br, K, Mg content combined as a potassium sign to consider.