| 玲珑金矿床成矿流体的物理化学 |
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| 引用本文：.1992.Physical Chemistry Of Ore-Forming Fluids In The Linglong Gold Deposit[J].Mineral Deposits,11(3):221~232 |
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| 中文摘要:玲珑金矿床为胶东著名的含金石英脉型矿床。作者详细研究了与金矿化密切相关的脉石英流体包体特征及其均一温度、爆裂温度、气液相成分。运用热力学分析和数学地质方法，计算了成矿流体盐度、密度、压力，以及成矿环境的Eh和pH等物理化学参数。为矿床成因研究提供了众多的实际资料。 |
| 中文关键词:玲珑金矿 流体包裹体 成矿物化条件 |
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| Physical Chemistry Of Ore-Forming Fluids In The Linglong Gold Deposit |
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| Abstract:Located some 150 km west of Yantai, Shandong Province, the Linglong gold deposit consists of a series of hydrothermal ore veins filling NEE-striking faults within the Linglong granite formed by metasomatism of Jiaodong Group (Precambrian metamorphic rocks). Hydrothermal mineralization might be divivided into four stages: ① pyrite-quartz; ② quartz-pyrite; ③ polymetallic sulfides and ④ carbonates, with the major gold-associated minerals being quartz, pyrite, chalcopyrite, pyrrhotite, sphalerite, galena and calcite, and the major wall rock alterations including silicification, sericitization, pyritization and potassic alteration.Studies on fluid inclusions in quartz from ore veins indicate that there exist mainly two types of fluid inclusions, i.e. aqueous(or saline)inclusions containing a certain amount of CO2, and CO2-rich inclusions, with the occasional presence of CO2, liquid and gas three-phase inclusions. Homogenization temperatures of fluid inclusions at the early mineralization stages range from 200℃ to 370℃, and can reach as high as 450℃for a few critical inclusions. The minimum ore-forming pressures vary in the range of 2.13×107～6.27×107Pa for Stage I and 2.17×107～8.63×107 Pa for Stage II. Ore-forming fluids are characterized by high concentration of CO2 and relatively low salinity. Average XCO2 (wt％) values are 8.2～14.5 and 8.4～25.3 for Stage I and Stage II respectively, whereas fluid salinities(equiv. wt％ NaCl)are correspondingly 2.6～6.5 and 4.2～5.8. Other physicochemical conditions for ore-forming fluids of the initial stages are pH 5.01～5.77, Eh -0.53～-0.55, m Na +0.2～0.5, m K +0.037～0.87, m Cl 0.2～0.6 and densities 0.83～0.87 g/cm3. |
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