【摘要】 小秦岭和胶东地区绿岩型金矿床的矿化类型和成矿流体的包裹体、稳定同位素特征有很多相似之处，但也有些区别。小秦岭金矿床的流体包裹体具更高的ＣＯ２／Ｈ２Ｏ、较低的Ｋ＋／Ｎａ＋和Ｆ－／Ｃｌ－，这与该区的成矿压力较高、容矿主岩以相对贫Ｋ＋、Ｆ－的斜长角闪岩和灰色片麻岩类有关。而胶东地区金矿床的容矿主岩则以富Ｋ＋、Ｆ－的长英质岩石为主。小秦岭金矿床较低的δ１８Ｏ值、胶东地区δ１８Ｏ值随着距海岸位置的变化等现象均表明这两个地区金矿床的成矿溶液与大气降水有着密切联系更多还原

【Abstract】 Gold deposits both in Xiaoqinling Mountains and in Jiaodong Peninsula occur within the Precambrian granitoid greenstone terrains, controlled by ductile shear zones or ductile brittle fracture zones. They have many similarities in mineral paragenesis, wallrock alteration, fluid inclusions and stable isotope composition. Ore forming fluids are characterized by low salinities(generally lower than 10 equiv. wt% NaCl) and relatively high CO 2 contents. Fluid inclusions in the main ore forming stages are rich in CO 2; nevertheless, in earlier quartz of altered rocks, fluid inclusions containing NaCl crystals can be seen. The homogenization temperatures vary from 250 to 350℃ (even up to 450℃) during the early stage and from 150 to 250℃ (even down to 100℃) in the late stage. The CO 2/H 2O ratios of fluid inclusions in Xiaoqinling Mountains are higher than those in Jiaodong, suggesting that ore forming pressure was higher in Xiaoqinling Mountains than in Jiaodong. K +/Na + ratios of fluid inclusions in quartz have much to do with host rook, being usually higher than 1 0 in gold deposits related to felsic host rock while lower than 1 0 in vein gold deposits related to dioritic or mafic host rock. Measured δD values of fluid inclusions and calculated δ 18 O H 2O in vein quartz of both areas indicate that the water of ore forming fluids was associated with meteoric water. The observed difference between the two areas may have resulted from elevation and/or continental effect. δ 34 S values of sulfides from gold deposits in both areas indicate that sulfur might have originated from the process of granitization in the basement. However, the higher δ 34 S values in Jiaodong than those in Xiaoqinling Mountains may also imply the influence of the underground water affected by paleo sea water rich in 34 S.更多还原