1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. College of Geography Sciences, Harbin Normal University, Harbin 150025, China;
3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China;
4. Provincial Key Laboratory of Oil&Gas Chemical Technology, College of Chemistry&Chemical Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China

Taking the Yangshulin profile of Shuiquanzigou-Tianshankou fault zone as the research object, the characteristics of fault activity and the possibility of slight temperature rise caused by fault activity are discussed based on the traditional clay mineral geothermometer. The phase as well as the major elements of the fault gouge and clay minerals in it was also studied using X-ray powder diffraction (XRD) and X-ray fluorescence spectroscopy (XRF). Moreover, scanning electron microscopy (SEM) was used to characterize the micro-morphology of quartz grains separated from the fault gouge. The results show that the fault in which the Yangshulin profile is located mainly experienced stick-slip events with weak fault activity and low water-rock reaction. The clay minerals in the fault gouge mainly consists of illite-smectite mixed-layer minerals. The degree of smectite illitization and the change trend of the content of clay minerals in the direction perpendicular to the fault surface indicate that the illite-smectite mixed-layer minerals may be affected by the co-seismic frictional heating effect. The formation temperature of illite-smectite mixed-layer minerals is estimated between 140℃ and 160℃ by clay minerals geothermometer. The difference between the highest and the lowest formation temperature of illite-smectite mixed-layer minerals is 20℃, which may represent a slight temperature rise caused by co-seismic friction.