The formations of many mesothermal gold-quartz deposits are closely re1ated with fluid pressure. In the course of ore-forming of gold deposits, fractures act as values, promoting cyclic fluctuations in fIuid pressure ...The formations of many mesothermal gold-quartz deposits are closely re1ated with fluid pressure. In the course of ore-forming of gold deposits, fractures act as values, promoting cyclic fluctuations in fIuid pressure from lithostatic to hydrostatic values. Once the fluid pressure satisfies the condition of hydrofracture: P- q>T, the cracks undergo fracturing and extension. By hydrofracturing, the pre-existing fau1ts reactivate, forming steep or flat dipping shear zones. At the same time, deposition within fau1t veins is attributed to the immediate postfailure discharge phase.Fault self-sealing leads to reaccumulation of fluid pressure and a repetition of the cycle, During fracturing, many structures are formed, such as, banded compound veins, breccia that can be pieced together, and massive quartz veins in the Haopinggou and Woxi gold-quartz deposits.展开更多
文摘The formations of many mesothermal gold-quartz deposits are closely re1ated with fluid pressure. In the course of ore-forming of gold deposits, fractures act as values, promoting cyclic fluctuations in fIuid pressure from lithostatic to hydrostatic values. Once the fluid pressure satisfies the condition of hydrofracture: P- q>T, the cracks undergo fracturing and extension. By hydrofracturing, the pre-existing fau1ts reactivate, forming steep or flat dipping shear zones. At the same time, deposition within fau1t veins is attributed to the immediate postfailure discharge phase.Fault self-sealing leads to reaccumulation of fluid pressure and a repetition of the cycle, During fracturing, many structures are formed, such as, banded compound veins, breccia that can be pieced together, and massive quartz veins in the Haopinggou and Woxi gold-quartz deposits.
