Abstract In the present study the stability of the phases pertaining to the Cu–Fe–S–O–H compositional system is investigated using the Eh-pH prevalence diagrams. Calculations were performed under the PHREEQC formalism, simultaneously accounting for all concurrent equilibria. Accordingly, point-to-point mass balance diagrams were realised, changing initial parameters to explore the dependence of the system on the temperature, and on the metal-to-sulfur ratio. Among the most relevant results, discussed in comparison with the previous existing literature mainly driven by calculation performed under the so-called line method approximation, the occurrence of large field of stability of the ternary species (and, among them, of delafossite, CuFeO2) and the net change of some boundaries in the stability fields of the binary species, due to competing equilibria. The results have been discussed on the light of the occurrence of these minerals in cuprous and ferrous mineralizations, and in the perspective of possible application in Corrosion Science.

中文翻译：

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Cu-Fe-S-O-H体系中铜铁矿和其他相关三元相的热化学稳定性

摘要 在本研究中，使用 Eh-pH 流行图研究了与 Cu-Fe-S-O-H 组成系统有关的相的稳定性。计算是在 PHREEQC 形式主义下进行的，同时考虑到所有并发平衡。因此，实现了点对点质量平衡图，改变初始参数以探索系统对温度和金属硫比的依赖性。在最相关的结果中，与以前的现有文献相比，主要由在所谓的线法近似下进行的计算进行讨论，三元物种（其中包括铜铁矿，CuFeO2）出现大的稳定场以及二元物种稳定性场中某些边界的净变化，由于竞争均衡。从这些矿物在亚铜和亚铁矿化中的赋存情况以及在腐蚀科学中可能应用的角度对结果进行了讨论。