成矿热液演化过程中大气降水加入的流体包裹体证据——以文峪金矿为例

FLUID INCLUSION EVIDENCE FOR METEORIC WATER INVOLVED IN HYDROTHERMAL FLUID EVOLUTION:TAKING WENYU GOLD DEPOSIT AS AN EXAMPLE

对文峪金矿５３０脉各成矿阶段石英中不同期次的流体包裹体进行了较为详细的显微观察和测温研究，在成矿作用的Ⅱ，Ⅲ阶段有大气降水的加入，其中Ⅱ阶段只有少量的大气降水加入，Ⅲ阶段有较多的大气降水加入；成矿流体从早到晚，从富ＣＯ２转变为以Ｈ２Ｏ为主。

Fluid inclusions are investigated on quartzs of stage Ⅰ,Ⅱ,and Ⅲ from vein 530 of Wenyu mine.CO_2H_2O inclusions are dominant in both stage Ⅰ and Ⅱ vein quartzs whereas aqueous inclusions are dominant in stage Ⅲ vein quartzs.According to fluid inclusion microthermometry data,CO_2H_2O inclusions from stage Ⅰ through Ⅱ to Ⅲ indicate an evolving CO_2H_2ONaCl system.However,aqueous inclusions in stage Ⅲ vein quartzs are not the evolving result of CO_2H_2ONaCl system.Fluid inclusion data,combined with isotopic data,support that the aqueous inclusions are most likely derived from meteoric water.The oreforming fluids are CO_2rich in the earlier stages and H_2Orich in the latest stage.