湘西南石英脉型金矿矿物流体包裹体pH值和Eh值的估算

pH AND Eh ESTIMATED VALUES OF FLUID INCLUSIONSFROM QUARTZ VEIN-TYPE GOLD DEPOSITSIN SOUTHWESTERN HUNAN

以湘西南石英脉型金矿床为例，研究ｐ Ｈ、Ｅｈ 估算值的结果表明利用围岩蚀变反应方程以及采用碱金属离子、卤素元素离子估算ｐＨ 值是不完善的。本文根据热力学原则（ 相平衡、电价中和） 提出了矿物流体包裹体成分体系计算ｐＨ 估算值的方法，并且讨论了测试包裹体时气体成分外逸是影响ｐＨ 和Ｅｈ 估算值的主要因素之一。

The quartz vein-type gold deposits in southwestern Hunan Province are taken as examples. Researching results of pH and Eh estimated values from quartz-fluid inclusions have illustrated that it is incomplete to use the altered reactions or the ions of alkali metals and brine elements. According on thermodynamic rules,we suggested a method for calculating pH estimated values on the composition system of fluid inclusions, analyzed the main factors affecting pH and Eh estimated values and discovered that Eh estimated values using the two methods may been applied to examine removal of gaseous composition outward inclusions.