论文部分内容阅读
对内蒙古阿拉善西部碱泉子金矿床的石英流体包裹体进行了岩相学和显微测温分析,并分析了石英流体包裹体的氢、氧同位素组成。研究结果表明,石英中流体包裹体发育程度不太好,且粒度偏小,包裹体大小多为2.0～8.0μm,包裹体类型有气液二相盐水溶液包裹体(Ⅰ型)和含CO2三相包裹体(Ⅱ型),且以前者为主。包裹体均一温度为182.5～308.6℃,平均249.1℃;盐度为2.07%～9.21%,平均6.03%;成矿流体的密度为0.65～0.93g/cm3,属于中温低盐度低密度范畴;压力平均值为21.86MPa,对应的成矿深度平均值为2.19km,属于中浅深度范畴。成矿流体主要来源于变质水和岩浆水,并有少量大气降水的参与。水-岩反应、温度和压力的降低可能是导致碱泉子金矿金在容矿空间中卸载并富集成矿的主要原因。
The quartz fluid inclusions in the Alkazim gold deposit, western Alashan, Inner Mongolia, were analyzed by petrography and microthermometry. Hydrogen and oxygen isotopic compositions of quartz fluid inclusions were also analyzed. The results show that the fluid inclusions in quartz are not well developed and the grain size is small, and the size of inclusions is mostly 2.0 ~ 8.0μm. The inclusions include gas-liquid two-phase brine inclusions (type Ⅰ) and CO2 Phase inclusions (Ⅱ type), and the former mainly. The homogenization temperature of the inclusions is 182.5-308.6 ℃ with an average of 249.1 ℃. The salinity ranges from 2.07% to 9.21% with an average of 6.03%. The density of ore-forming fluid is 0.65-0.93g / cm3, The average value is 21.86MPa, corresponding to an average depth of 2.19km, belonging to shallow depth category. The ore-forming fluids are mainly derived from metamorphic and magmatic water with a small amount of atmospheric precipitation. The water-rock reaction, the decrease of temperature and pressure may be the main reason of Alkaline gold gold being unloaded and enriched in ore-forming space.