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| 贵州水银洞金矿床成矿流体不混溶的包裹体证据 | |
| 引用本文： | 李保华,顾雪祥,付绍洪,徐仕海,陈翠华,董树义.贵州水银洞金矿床成矿流体不混溶的包裹体证据[J].地学前缘,2010,17(2):286. |
| 作者姓名： | 李保华 顾雪祥 付绍洪 徐仕海 陈翠华 董树义 |
| 作者单位： | 1. 成都理工大学,地球科学学院,四川,成都,610059 2. 中国地质大学(北京)地球科学与资源学院,北京,100083 3. 中国科学院,地球化学研究所,贵州,贵阳,550002 |
| 基金项目： | 国家自然科学基金，国家自然科学基金重点项目，矿物学岩石学矿床学国家重点(培育) 学科建设项目 |
| 摘 要： | 通过对水银洞金矿床中流体包裹体的观测和热力学参数计算,探讨了成矿流体不混溶的热力学条件。研究结果表明,该矿床石英中的流体包裹体分为H_2O包裹体、CO_2包裹体和CO_2-H_2O包裹体三大类,并以富含CO_2-H_2O包裹体为特征,CO_2-H_2O包裹体可进一步划分为富H_2O相CO_2-H_2O包裹体和富CO_2相CO_2-H_2O包裹体。加热时富H_2O相CO_2-H_2O包裹体完全均一成H_2O相;而富CO_2相CO_2-H_2O包裹体完全均一成CO_2相,而且二者的完全均一温度和完全均一压力一致,说明它们是同时期捕获的CO_2-低盐水不混溶流体包裹体组合。它们形成时的热力学条件是:形成温度236℃,形成压力324 bar(1bar=10~5Pa);共存两相流体密度:低盐水相0.900 g/cm~3,CO_2相0.314 g/cm~3;共存两相中CO_2的摩尔分数:低盐水相0.0376,CO_2相0.7337;水溶液含盐度w(NaCl)约为1.3%。 |
| 关 键 词： | 水银洞金矿床 成矿流体 流体包裹体 不混溶流体 |
The evidence from fluid inclusions for the immiscibility of the ore-forming fluids in the Shuiyindong gold deposit, Guizhou Province |
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| Li Baohua,Gu Xuexiang,Fu Shaohong,Xu Shihai,Chen Cuihua,Dong Shuyi.The evidence from fluid inclusions for the immiscibility of the ore-forming fluids in the Shuiyindong gold deposit, Guizhou Province[J].Earth Science Frontiers,2010,17(2):286. | |
| Authors: | Li Baohua Gu Xuexiang Fu Shaohong Xu Shihai Chen Cuihua Dong Shuyi |
| Abstract: | Based on the microthermometry and thermodynamic parameters of fluid inclusions in the Shuiyingdong Au deposit, we have studied the thermodynamic conditions of the immiscibility of the ore-forming fluids. The results show that the fluid inclusions in quartz are divided into three categories: H_2O inclusions, CO_2 inclusions and CO_2-H_2O inclusions. The CO_2-H_2O inclusions can be further classified into H_2O-rich CO_2-H_2O inclusions and CO_2-rich CO_2-H_2O inclusions. When heated, the homogeneous phase state of H_2O-rich CO_2-H_2O inclusions was the H_2O phase, while that of CO_2-rich CO_2-H_2O inclusions was the CO_2 phase. Moreover, they have the same homogeneous temperature and pressure. This suggests that they were CO_2 and low-salt water immiscible fluid inclusions having been trapped in the same period. The thermodynamic conditions of their formation are the formation temperature of 236 ℃, pressure of 324 bar, low-salt water phase density 0.900 g/cm~3, CO_2 phase density 0.314 g/cm~3, the CO_2 mole fraction of 0.0376 in low-salt water phase and 0.7337 in CO_2 phase, and aqueous solution salinity w(NaCl)≈1.3%. |
| Keywords: | Shuiyindong gold deposit ore-forming fluid fluid inclusion immiscible fluid |
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