胶东金矿成矿流体同位素的地质特征

胶东大、中型金矿床成矿流体的Ｈ、Ｏ同位素组成显示出金矿床的初生成矿流体以岩浆水为主，在重熔花岗岩形成作用中继承了部分变质水，在高温阶段的成矿作用中以岩浆水为主，其后逐渐向大气降水方向演化，只有少部分矿床属大气降水成因。本文探讨了Ｈ．Ｐ．泰勒的水岩反应同位素交换质量平衡方程的应用条件，当水／岩比很小时，该方程不能确切判定关于成矿流体的成因，本文提供了以地质条件为前提的解析方法。成矿流体的Ｒｂ－Ｓｒ年龄揭示出胶东金矿主要成矿期为燕山晚期，成矿流体的ＩＳｒ与玲珑花岗质杂岩体中的郭家店、郭家岭型岩体一致，而成矿作用特别是与郭家岭型岩体重熔形成作用有关。

Isotope Geological Characteristics of Mineralizing Fluids of Gold Deposits in Jiaodong Area and a Discussion on the Application Conditions of H. P. Taylor's Equation

Systematic hydrogen and oxygen isotope studies of large-size and middle-size gold deposits in Jiaodong area show that primary mineralizing fluids were mainly made up of magmatic water. In the forming course of remelting granite, some metamorphic water was inherited. At the high temperature stage, mineralizing fluid was mainly magmatic water, which then tended to evolve into meteoric water. Only a few mineral deposits are of meteoric water origin. Application conditions of H. P. Taylor's equation on isotope exchange are discussed in this paper. It is pointed out that the equation fails to give a definite answer when the water/rock ratio is small. Rb_Sr isochron curve dating of fluid inclusions indicates that gold matallization occurred in Yanshanian stage, and that the I Sr of mineralizing fluids in not different from that of Guojiadian and Guojialing granite.