新疆彩霞山铅锌矿床流体包裹体研究

应用均一法、激光拉曼显微探针法研究彩霞山铅锌矿床的流体包裹体,发现其类型主要有单相盐水溶 液包裹体、气液两相盐水溶液包裹体两类,测得均一温度为180℃～310℃,最佳成矿温度为190℃～220℃,属 中低温矿床,代表矿区主要的成矿阶段。测得包裹体的冰点温度为-23.2℃～-0.8℃,盐度为1.4%～ 23.18%。气液两相包裹体中液相成分以水为主,气相成分以二氧化碳为主,单液相包裹体中成分为w(H2O)> w(CO2)。再据分馏方程计算得到热液水δ(18OH2O)为7～8。结果表明,矿床的形成与岩浆活动有关,矿床成因 应划归于与中酸性侵入岩浆活动有关的中低温热液脉状矿床。

Fluid Inclusions of Caixiashan Pb-Zn Deposit in Xinjiang

The fluid inclusions of Caixiashan Pb-Zn deposit are studied by Homogenization Method and Laser Raman Method. The systematical study shows that fluid inclusions in ores include two types: single-phase liquid inclusions (LH2O)and two-phase liquid-vapor inclusions(LH2O+ VH2O). Determination of homogenization temperatures of fluid in- clusions indicates that metallogenetic temperatures of the deposit, ranging from 180℃ to 310℃(usually 190℃ to 220 ℃), is low to moderate. Freezing process shows that freezing temperatures is from -23.2℃ to -0.8℃ , and the nu- merical table of freezing temperatures-salinity(Bodnar,1992)shows that salinity NaCl is from 1.4% to 23.18%. The liquid components of two-phase liquid-vapor inclusions is rich in H2O and gas components is rich in C2O, components of single-phase liquid inclusions shows that H2O> C2O. Theδ18OH2Ovalues from 7～ 8 by Distillation Equation. The re- sults indicate that the forming of the mineral deposit relates to magmation. The mineral deposit should be of low-to-mod- erate-temperature hot liquid origin relevant to acid-intermediate intrusive magmation.