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

Figure 1

Regional bedrock geological map and water sampling locations of the study area. Fault; probable fault; river; stratigraphic boundary; stratigraphic boundary (same period); basin boundary; elevation contour line; geothermal fields; (9) town; (10) cold groundwater sampling site; (11) mountain; (12) thermal groundwater sampling site; (13) nonthermal groundwater flow direction; (14) Paleozoic migmatite; (15) alluvium, proluvium, and marine deposits (Quaternary); (16) sandstone and conglomerate (Cretaceous); (17) biotite monzonitic granite (Early Cretaceous); (18) biotite monzonitic granite (late Cretaceous); (19) granodiorite (Middle Jurassic); (20) medium-grained granite (Middle Jurassic); (21) biotite monzonitic granite (Middle Jurassic); (22) sandstone, siltite, and shale (Carboniferous); (23) shale, conglomerate, and siltite intercalated with limestone (Devonian); (24) siliceous shale and mudstone (Ordovician); (25) migmatitic granite (Ordovician-Silurian); (26) sandstone and shale intercalated with limestone lenses (Cambrian); (27) sandstone, carbonaceous shale, and schist (Cambrian); (28) sandstone and siltite intercalated with carbonaceous shale (Cambrian); and (29) quartz schist and slate (Sinian). Geological data from the Guangdong Province Geological Bureau (1988) [16].