断裂带流体作用及动力学模型

FLUID FLOW AND DYNAMIC MODEL IN FAULT ZONES

越来越多的证据表明流体活动与断裂作用密切相关。断裂带流体活动不仅影响断裂发生、发展、封闭和断裂强度，而且影响到断裂带附近矿床的形成。断裂带活动为流体循环、水岩相互作用提供了必要条件，流体的再分配是断裂带中应力积累和释放的响应。流体压力和剪切压力的耦合变化影响断裂带摩擦作用中剪切强度的变化，进而控制断裂发生和停止。因此，断裂带流体活动的幕式变化指示了断裂活动事件或地震活动旋回。

More and more evidences show a close relationship between the fluid flow and the faulting activity. Fluid flow in fault zones not only affects the formation, development and decay of faulting and fault strength, but also controlled the formation of mineral deposits adjacent to the fault zones. Fluid flow leads to the recirculation of fluid and water rock interaction in a fault zone. Redistribution of fluid makes a quick response to the accumulation and expulsion. Coupling fluctuation in fluid pressure and shear stress influence the fault shear strength during frictional reactivation and control over the relative timing of fault opening and sealing. Hence, episodic variation of fluid flow indicates the cyclic fluctuation of faulting or seismic activity.