高压流体与中、低温石英脉型金矿床

HIGH-PRESSURE FLUID AND MESOTHERMAL AND EPITHERMAL GOLD-QUARTZ DEPOSITS

在中低温石英脉型金矿床成矿过程中，断裂带起着一个阀门作用，它引起了成矿流体压力的周期性变化。当流任满足矿液压裂的条件（σ3a-P≤－t）时，裂隙产生破裂、扩展。破裂后应力的突然释放，在断层带内产生了矿液的涌入、成矿物质的沉淀富集等作用，随后断层带的自我封闭，又导致了流压的重新积累而产生了周期性重复。矿脉就是在这种周期性的高压流体作用方式下形成的。

In the mesothermal and epithermal gold-quartz deposits mineralization, the fracturezone acts as a valve, promoting cyclical fluctuations of fluid-pressure. When fluid pressure ishigh enough to hydraulic-fracturing (3, - p≤-t), fractures extend. The stress immediatepostfailure discharge leads to mineralizing fluid cramming and mineralizing-matters deposition with faults, and faults self-sealing leads to reaccumulation of fluid pressure and a repetition of the cycle. The ore-veins arc formed under the ways of high-pressure fluid's action.