The chemical compositions, including hydrogen and oxygen isotopes, of 35 hot spring waters in Toyama Prefecture, central Japan, were analyzed to examine their geochemical characteristics and geothermal resources. The hot spring water samples were classified into two groups: low and high chloride (Cl⁻) concentrations of less than and greater than 2000 mg/L, respectively. The samples in the low-salinity group were determined to be of meteoric origin and Ca²⁺–HCO₃⁻ type. The samples in the high-salinity group were determined to be of Na⁺–Ca²⁺–Cl⁻ type and assumed to contain a mixture of fossil seawater and meteoric water. In the eastern area of the study region, the Na⁺/K⁺ and SiO₂ concentrations were lower and higher, respectively, than those in other areas, which corresponded to high-temperature geothermal resources. Thus, the subsurface information obtained in this study enabled effective use of the low to medium geothermal resources in Toyama Prefecture.

对日本中部富山县的35个温泉水的化学组成（包括氢和氧同位素）进行了分析，以检查其地球化学特征和地热资源。低和高氯（CL：温泉水样品分为两组^-分别的浓度小于和大于2000毫克/升）。低盐度组中的样品被确定为大气起源和Ca ²⁺ -HCO ₃ ^-型。高盐度组中的样品被确定为的Na ⁺ -Ca ²⁺ -Cl ^-型和假定包含化石海水和大气水的混合物。在研究区域的东部，⁺ / K ⁺和SiO ₂浓度分别低于和高于其他地区，这与高温地热资源相对应。因此，在这项研究中获得的地下信息使富山县的中低地热资源得以有效利用。