Abstract The Xianshui river fault zone is located in the western Sichuan Plateau, on the eastern edge of the Himalayan Geothermal Belt; numerous hot springs are exposed at the surface and distributed along the fault zone, forming an area of high-temperature hydrothermal activity. The genetic mechanisms of these high-temperature geothermal systems is currently unclear, which poses an urgent scientific problem in the field of geothermal research This study uses numerical simulation methods based on geological, hydrological, geothermal, and geophysical data to study the effects of shear frictional heat on high-temperature hydrothermal activity in the research area under the conditions of different slip velocities, parameters of thermal materials, and strain rates of the Xianshui river left-slip fault zone. The results show that shear frictional heat is the main contributor of the local thermal anomalies in the high-temperature hydrothermal system of the Xianshui river fault zone. The local high temperature generated by shear friction causes the crust to partially melt at a depth of 20–25 km; this provides the heat source for the striped geothermal system, which is controlled by the Xianshui river fault zone. In addition, the surface heat flow generated by shear friction was measured at 10 Ma, along a two-dimensional section across the Xianshui river fault in an E–W direction, and it was found to be approximately 5–50 mW/m2. Furthermore, the nonlinear relationship between thermal conductivity, thermal capacity, shear stress, and temperature gives the shear frictional heat generation process "positive" and "negative" feedback effects, which maintain the dynamic equilibrium.

中文翻译：

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川西鲜水河走滑断层剪切摩擦生热效应

摘要 鲜水河断裂带位于四川高原西部，喜马拉雅地热带东缘；地表出露大量温泉，沿断裂带分布，形成高温热液活动区。这些高温地热系统的成因机制目前尚不清楚，是地热研究领域亟待解决的科学问题 本研究采用基于地质、水文、地热和地球物理数据的数值模拟方法，研究剪切摩擦的影响。鲜水河左滑断裂带不同滑移速度、热材料参数和应变速率条件下对研究区高温热液活动的热影响。结果表明，剪切摩擦热是鲜水河断裂带高温热液系统局部热异常的主要贡献者。剪切摩擦产生的局部高温导致地壳在20-25公里深处部分熔化；这为受鲜水河断裂带控制的条状地热系统提供了热源。此外，在 10 Ma 时，沿着横跨鲜水河断层的二维剖面沿东西向测量了剪切摩擦产生的地表热流，发现大约为 5-50 mW/m2。此外，热导率、热容量、剪切应力和温度之间的非线性关系赋予剪切摩擦生热过程“正”和“负”