【作者】 杨崇辉； 韩志勇； 张寿广； 刘玉琳；

【Author】 Yang Chonghui Han Zhiyong Zhang Shouguang(Institute of Geology, CAGS, Beijing)Liu Yulin(Department of Geology, Peking University)

【机构】 中国地质科学院地质研究所； 北京大学地质系；

【摘要】 高庄金矿流体包裹体的沸腾现象明显,最常见的是含液体CO₂包裹体和充填度不等的气液两相包裹体及气体包裹体和液体包裹体.包裹体的均一温度在160～380℃之间,捕获压力在90～160MPa,盐度ω(NaCl_ep)在2.4%～13.6%之间.热液中离子成分以Na⁺、K⁺、Cl^-、SO₄^2-等为主,具有低盐度、低密度、略偏酸性及偏还原性等特点,属Na（K）-Cl（SO₄）-CO₂-H₂O体系.研究表明高庄金矿成矿流体主要由变质水和大气水混合而成,流体的减压沸腾是造成金沉淀的重要原因.更多还原

【Abstract】 Located in the eastern part of the northern Qinling orogenic belt, the Gaozhuang gold deposit is strictly controlled by the shear zone in the Erlangping group-complex. The quartz in gold deposits contains abundant fluid inclusions, which are mainly three phase inclusions that contain liquid CO2, two phase gas-liquid, and one phase gas-phase inclusions and, next, one phase liquid inclusions. The most striking characteristic of fluid composition is the enrichment of CQ, even more than H2O in some samples. The studies of the fluid inclusions show that the ore-forming fluid is a salt-CC,-r,O system of which the composition varied from Na+- K+-C1--S05- type at depth to K + -Na+-SC,--Cl- type at shallow. The salinity, temperature and pressure of the fluid is in range of w(NaCleq)8. 7% - 13. 6% , 130 - 380,C and 90-100MPa, respectively.  values and S18O values of ore-forming fluid is in the range of -74%--56%o and 1.4%o-2. 8%o, respectively, being different both from the composition ofthe initial magmatic water and from the composition of the meteoric water, suggesting that the fluid is mixed in origin. Au- source was mainly from the depth and Au-rich metavolcanite. Metallogenesis was the result of long-term and multistage evolution, and the main gold mineralization period occurred in the Yanshanian, during which intense tectonism and magamatism took place. Decompression and boiling of fluid resulted in the deposit of gold in the area.更多还原