新疆东天山土屋斑岩铜矿床流体包裹体地球化学特征
Fluid inclusion geochemistry of Tuwu porphyry copper deposit, eastern Tianshan in Xinjiang
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摘要: 本文在系统总结前人关于土屋矿床地质特征及成矿作用的基础上，开展了氢氧同位素研究及石英流体包裹体均一法和冷冻法测温，并对石英样品进行了气相及离子色谱测量，对石英中流体包裹体中的稀土元素进行了测试。结果表明，流体包裹体均一温度变化于125~363℃，主要集中于140~200℃，盐度变化于0.18%~58.28%NaCl，主要集中于2%~10% NaCl。流体包裹体气相的主要成分为H2O和CO2，液相成分以Ca2+、Na+、SO2-4、Cl-为主。石英流体包裹体中∑REE 为8.07×10-6~ 12.15×10-6，轻、重稀土之比值（LREE/HREE）变化于5.39~6.75，δEu为1.80~1.91。流体包裹体中稀土元素配分型式呈右倾型，并表现出Eu的正异常及Ce的负异常。石英中流体包裹体的δDV-SMOW值为-70‰~-66‰，石英的δ18OV-SMOW为9.4‰~12.3‰，计算所得的δ18O水为-5.1‰~-1.2‰。根据离子色谱分析结果，F-/Cl-介于0.009~0.024之间，SO2-4/Cl-介于0.45~1.01之间。综合以上流体包裹体的组成和特征，表明成矿流体可能主要来源于岩浆水和大气降水。Abstract: Based on a systematical summing-up of the previous research on the geological characteristics and mineralization of Tuwu porphyry copper deposit, the authors carried out supplement measurements of hydrogen and oxygen isotopes, homogeneous and freezing temperatures analysis of fluid inclusions in quartz, gas and ion chromatographic analysis of quartz samples and analysis of REE in fluid inclusions of quartz. The results show that the homogenization temperatures of the fluid inclusions vary from 125 to 363℃, and mostly range from 140 to 200℃. The salinities of fluids range from 0.18% NaCl to 58.28% NaCl，and mostly range from 2% NaCl to 10% NaCl. The gas components of fluid inclusions are mainly H2O and CO2, and the liquid components of fluid inclusions are mainly Ca2+, Na+, SO2-4, Cl-. The ∑REE of fluid inclusions range from 8.07×10-6 to 12.15×10-6, the LREE/HREE ratios vary from 5.39 to 6.75, and δEu ranging from 1.80 to 1.91. The ore fluid in the fluid inclusions display right-inclines chondrite-normalized REE distribution patterns and positive Eu and negative Ce anomaly. The δDV-SMOW of the inclusions in quartz range from -70‰ to -66‰, and the δ18OV-SMOW values of quartz range from 9.4‰ to 12.3‰. According to the calculated results the δ18OH2O range from -5.1‰ to -1.2‰. The results of ion chromatographic analysis showing that the ratio of F-/Cl- range from 0.009 to 0.024, and that of SO2-4/Cl- range from 0.45 to 1.01. It is suggested that the ore-forming fluid was mainly derived from mixture fluid of meteoric water with magma water.
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Key words:
- Fluid inlusion /
- Geochemistry /
- Porphyry copper deposit /
- Tuwu
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