小秦岭地区花岗岩体中CO_2-H_2O包裹体的找矿意义

CO 2 H 2O Inclusions and Their Prospecting Significance from Granites in Xiaoqinling Area,Henan Province

小秦岭地区与金矿成因有关的燕山期文峪花岗岩及其派生石英脉中发育了非常丰富的ＣＯ２－Ｈ２Ｏ包裹体，其流体为富含ＣＯ２的低盐度（＜１０％ＮａＣｌ）流体，这与含金石英脉内的包裹体类型及金矿成矿流体性质上十分相似。与金矿成因无关的华山岩体内包裹体类型则为水溶液包裹体，流体性质为贫ＣＯ２的低盐度流体。与金矿有关，但其周围矿化很差的娘娘山岩体内ＣＯ２－Ｈ２Ｏ包裹体数量很少。因此，ＣＯ２－Ｈ２Ｏ包裹体可以作为与金矿成因有关的花岗岩体关联程度的判别标志。

There are abundant CO 2 H 2O fluid inclusions in Yanshanian Wenyu granite which is known to be related with gold mineralization, showing that fluids are enriched in CO 2 with lower density (<10wt%NaCl) and similar to fluid inclusion types and fluid nature in gold bearing quartz veins. Fluid inclusions in Huashan granite, which is not related with gold mineralization, are aqueous type with poor CO 2 and low salinity. Less CO 2 H 2O inclusions are developed in Liangliangshan granite, which has relations with gold mineralization but poor gold veins occurring in nearby metamorphic rocks. CO 2 H 2O inclusions can be used as symbol to identify relationship degree between granite and gold mineralization, and CO 2 H 2O inclusion abundance can be practiced to evaluate gold grade, mineralizing scale and exploration potentials.