地学前缘 ›› 2010, Vol. 17 ›› Issue (2): 286-294.

• 论文 • 上一篇    下一篇

贵州水银洞金矿床成矿流体不混溶的包裹体证据

李保华, 顾雪祥, 付绍洪, 徐仕海, 陈翠华, 董树义   

  1. 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
  • 收稿日期:2010-01-20 修回日期:2010-03-10 出版日期:2010-03-15 发布日期:2010-04-05
  • 作者简介:李保华(1960—),男,教授,主要从事流体包裹体研究。E-mail: libaohua@cdut.edu.cn
  • 基金资助:

    国家自然科学基金项目(40873036,40772060);国家自然科学重点基金项目(40930423);矿物学岩石学矿床学国家重点(培育) 学科建设项目(SZD0407)

The evidence from fluid inclusions for the immiscibility of the oreforming fluids in the Shuiyindong gold deposit, Guizhou Province.

LI  Bao-Hua, GU  Xue-Xiang, FU  Chao-Hong, XU  Shi-Hai, CHEN  Cui-Hua, DONG  Shu-Xi   

  1. 1College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
    2School of Earth Sciences and  Resources, China University of Geosciences, Beijing 100083, China
    3Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
  • Received:2010-01-20 Revised:2010-03-10 Online:2010-03-15 Published:2010-04-05
  • Supported by:

    国家自然科学基金项目(40873036,40772060);国家自然科学重点基金项目(40930423);矿物学岩石学矿床学国家重点(培育) 学科建设项目(SZD0407)

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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H2O包裹体、CO2包裹体和CO2－H2O包裹体三大类,并以富含CO2H2O包裹体为特征,CO2－H2O包裹体可进一步划分为富H2O相CO2H2O包裹体和富CO2相CO2－H2O包裹体。加热时富H2O相CO2-H2O包裹体完全均一成H2O相;而富CO2相CO2H2O包裹体完全均一成CO2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CO2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(1 bar=105 Pa);共存两相流体密度:低盐水相0.900 g/cm3,CO2相0.314 g/cm3;共存两相中CO2的摩尔分数:低盐水相0.037 6,CO2相0.733 7;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

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: H2O inclusions, CO2 inclusions and CO2H2O inclusions. The CO2H2O inclusions can be further classified into H2Orich CO2H2O inclusions and CO2rich CO2H2O inclusions. When heated, the homogeneous phase state of H2Orich CO2H2O inclusions was the H2O phase, while that of CO2rich CO2H2O inclusions was the CO2 phase. Moreover, they have the same homogeneous temperature and pressure. This suggests that they were CO2 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/cm3, CO2 phase density 0314 g/cm3, the CO2 mole fraction of 00376 in lowsalt water phase and 07337 in CO2 phase, and aqueous solution salinity w(NaCl)≈13％.

Key words: Shuiyindong gold deposit, oreforming fluid, fluid inclusion, immiscible fluid

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