This is the first work attempted to apply clay minerals as indicators for hydrothermal processes in the Tuchang-Chingshui Geothermal field, Taiwan, where is one of few geothermal power plants operated in low-grade mata-clastic rocks. The bedrock of the study area consists mainly of argillite, slate, and meta-sandstone. A systemically sampling scheme was implemented on outcrops along the riverbank in the region. This effort was made for establishing the relationship between the spatial distribution of clay mineral assemblages and hydrothermal processes by using XRD. Analysis results show that smectite and mix-layer of clay minerals are coexistence with local geothermal activities in the area. This indicator can be used to help identify the hydrothermal fluid pathway.

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