Hydrogeochemical Characteristics and Geothermometry Applications of Thermal Waters in Coastal Xinzhou and Shenzao Geothermal Fields, Guangdong, China

Figure 11

Schematic hydrogeological section showing the proposed circulation model of thermal groundwater in the coastal Xinzhou geothermal fields (blue to red arrows of “regional groundwater flow” indicate cold to hot water). Inset figures show the variation in temperatures versus monitoring depth. Bores show an increased geothermal gradient within the upper 0–200 m and a steady temperature gradient. The geothermal gradient remains constant within a range of 0.03–0.05°C/m below 400 m and down to the bottom, emphasizing the influence of the geothermal water.