【摘要】 采集了 4个不同地区花岗岩石英、热液脉石英 ,分析其中包裹体分子水与结构羟基水的含量、包裹体分子水的δDinclusion、结构羟基水的δDOH,计算了结构羟基水 包裹体分子水之间的D/H分馏系数αOH inclusion。考查了混合水 (结构羟基水 +包裹体分子水 )δDwhole water与单独包裹体水δDinclusion之间的差别 ,分析了这种差别与分馏系数αOH inclusion的关系。结果表明 :花岗岩样品中两种水之间的分馏系数小 ,分馏程度大 ,在常规分析中 ,若采用测定混合水δDwhole water值代表实际流体 (包裹体水 )δDinclusion值时 ,二者间有较大的差异。热液石英脉样品总体来说分馏系数接近于 1,分馏程度小 ,常规分析中引起的二者之间差异小。常规的分析方法用于分馏程度小的热液脉石英是可行的 ,但进行花岗岩石英水的氢同位素分析时有必要区分出包裹体水与羟基水。更多还原

【Abstract】 For quartz samples from four different geologic sites, both granitic and hydrothermal,their inclusion water and OH species were separated by stepwise heating technique,their δD inclusion,δD OH were measured respectively in a standard hydrogen extraction line, and hydrogen isotope fractionation factor α OH-inclusion between inclusion water and OH species, δD whole-water was investigated . It is shown that on an average a large difference between δD whole-water and δD inclusion occurs in granitic quartz , but a slight difference in hydrothermal quartz. In other words, on an average α OH-inclusion departures from 1 in granitic quartz and is close to 1 in hydrothermal quartz. It is suggested when measuring δD of water in granitic quartz to trace the fluid sources, one may have to determine inclusion water other than to only determine the whole water which includes both inclusion water and OH species. It seems that for hydrothermal quartz the conventional method is of no problem. The authors note that the above conclusion only comes from 37 samples and more work is needed in the future.更多还原