江西永平铜矿下盘网脉状矿化的流体包裹体研究
Fluid inclusion studies on footwall stringer system mineralization of Yongping massive copper deposit, Jiangxi province, China
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摘要: 永平块状硫化物矿床下盘脉状矿化的流体包裹体的温度介于220—400℃，原始流体盐度5．1～9．3wt．％NaCl。第一阶段脉状矿化形成于较低的温度范围（集中于220～320℃），此后流体温度逐渐升高，形成了第二阶段脉状矿化（240—400℃），最后流体温度稍微降低形成了第三阶段脉状矿化（290～370℃）。在演化过程中流体盐度也发生变化。形成第一脉状矿化时流体盐度较高（为6～9wt．％NaCl）。第二阶段脉状矿化时流体盐度变化不大（5．1～9．1wt％NaCl），但该阶段流体明显发生过沸腾作用，造成了端员组分的流体盐度分别为1．2～3．3wt％NaCl和41．2～45．5wt％NaCl。第三阶段矿化脉的形成时，流体的盐度有所降低（3．5～7．9wt％NaCl），也可见到局部的沸腾作用。三阶段脉状矿化脉石英流体包裹体的Cl^-和SO4^2的含量从第一阶段到第二阶段明显增高，到第三阶段降低；Na^＋、K^＋从第一阶段到第二阶段明显增高，到第三阶段有所降低。三阶段脉状矿化中的流体包裹体中均含有微量的二氧化碳（CO2）、硫化氢（H2S）和氮气（N2）等挥发组分，其中第二阶段脉状矿化中的挥发份相对其它两阶段脉较为富集。
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Key words:
- Fluid inclusion /
- Stringer system mineralization /
- Yongping copper deposit /
- Jiangxi
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