热液体系水-岩作用过程中的氧氢同位素行为

论述水-岩作用过程氧氢同位素地球化学行为特征。列举西华山钨矿、台上金矿、白乃庙金矿和额仁陶勒盖银矿的水-岩体系氧（氢）同位素组成特征。论证了开放体系单阶段和二阶段水-岩反应中氧同位素行为接近于封闭体系氧同位素交换演变轨迹，具有成因指示意义，但不具定量意义。探讨了大气降水热液矿床矿体产出位置与氧同位素组成之间关系。本文还指出开放体系中氢同位素动力分馏行为控因复杂，主要由于1H相对富集于各种含氢气体中逃逸出热液体系，使热液体系氢同位素地球化学行为偏离理论演化轨迹，因此氢同位素组成的成因指示意义远不如氧同位素。

OXYGEN AND HYDROGEN ISOTOPE BEHAVIOR IN HYDROTHERMAL WATER-ROCK INTERACTION PROCESS

The geochemical behaviors of oxygen and hydrogen isotopes in water-rock interaction are discussed. The water-rock systems and O and H isotopic characteristics for Xihuashan tungsten ore deposit, Taishang gold deposit, Bainaimiao gold deposit, and Eren Tolgoi silver deposit are presented.It is pointed out that oxygen isotopic bahavior in open system, with single step or two-stepped water-rock interaction, is similar to that in closed system. There fore, for oxygen isotope composition, it is effective in genetic research, but not quantithtive The relations between oxygen isotopic composition and orebody occurrence position are also discussed. It is indicated in this paper that controlling factors for hydrogen isotope kinetic fractionation are complicated in open system, mainly because of the escaping of 1H-rich species of gas from hydrothermal system which results in the deviation of H behavlor. Comparatively, the genetic significance of hydrogen isotope is much less than that of oxygen isotope composition in water-rock system.