Abstract In the last decades, a growing number of works has increasingly focused on the study of thermal waters using the approach described by Giggenbach (1988). Based on the dependence on temperature of the equilibrium constants, the Na-K-Mg diagram is the combination of the Na-K and K-Mg geothermometers. The pristine approach proposed by Giggenbach (1988) included several constraints for its successful application. In spite of this, the Na-K-Mg diagram is often used out of the boundaries conditions of applicability. In order to promote a proper use of the diagram, a detailed description is given and several examples of mixing, dilution and concentration are discussed. The obtained findings highlight the need of cautiousness when using the diagram to estimate temperature of hydrothermal systems.

中文翻译：

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使用和滥用 Giggenbach 三元 Na-K-Mg 图

摘要 在过去的几十年里，越来越多的工作越来越关注使用 Giggenbach (1988) 描述的方法研究热水。基于平衡常数对温度的依赖性，Na-K-Mg 图是 Na-K 和 K-Mg 地温计的组合。Giggenbach (1988) 提出的原始方法包括对其成功应用的几个限制。尽管如此，Na-K-Mg 图经常在适用性的边界条件之外使用。为了促进图表的正确使用，给出了详细的描述，并讨论了混合、稀释和浓缩的几个例子。获得的研究结果强调了在使用该图估计热液系统温度时需要谨慎。