Science. 1994 Sep 9;265(5178):1558-61. doi: 10.1126/science.265.5178.1558.
The addition of hydrothermal fluids to heated, intact granite leads to permeability reductions in the temperature range of 300 degrees to 500 degrees C, with the rate of change generally increasing with increasing temperature. The addition of gouge enhances the rate of permeability reduction because of the greater reactivity of the fine material. Flow rate is initially high in a throughgoing fracture but eventually drops to the level of intact granite. These results support the fault-valve model for the development of mesothermal ore deposits, in which seals are formed at the base of the seismogenic zone of high-angle thrust faults. The lower temperature results yield varying estimates of mineral-sealing rates at shallower depths in fault zones, although they generally support the hypothesis that such seals develop in less time than the recurrence interval for moderate to large earthquakes on the San Andreas fault.
向加热的完整花岗岩中加入热水会导致渗透率在 300 到 500 摄氏度的温度范围内降低，其变化率通常随温度升高而增加。由于细粒材料的反应性更强，添加构造角砾岩会加速渗透率的降低。在贯穿裂缝中，初始流速很高，但最终会降至完整花岗岩的水平。这些结果支持了中温热液矿床形成的断层阀模型，其中在高角度逆冲断层的地震活动带底部形成了密封。较低的温度结果得出了在断层带较浅深度处矿物密封速率的不同估计值，尽管它们普遍支持这样的假设，即这种密封的形成时间比圣安德烈亚斯断层上中到大地震的复发间隔时间短。
