Hyperspectral remote sensing characteristics of clay minerals in the Yishu fault zone and their role in revealing geothermal resources

Clay minerals in the Yishu fault zone, as typical products of hydrothermal activity, carry critical information regarding subsurface geothermal processes.To clarify their hyperspectral remote sensing characteristics and their guiding value for geothermal resource exploration, this study takes the Yishu fault zone and three key subareas (Tangtou, Tongjing and Fangzi) as the research objects.Based on ZY1-02D hyperspectral remote sensing data, combined with principal component analysis and the Crsta method, we analysed the spectral features of typical clay minerals (illite, montmorillonite and chlorite) and extracted their spatial distribution patterns.In addition, ZY1-02E thermal infrared data were used to invert the land surface temperature so as to explore the spatial correlation between clay mineral distribution and geothermal anomalies.The results show that the spatial distribution of clay