By using regional geochemical data in combination with regional geological conditions to determine geothermal prospect areas, researchers can evaluate the potential of geothermal resources. Data research shows that geochemical characteristics of geothermal areas of different genetic types in Jingjinji are different. The lower mild anomalies of As, Sb, Bi, Hg, F, Li, Sn, U, Th and other elements may have corresponding indication effects to different types of geothermal areas. Various types of geothermal geochemical indicator elements are as follows: Li-F-As-U for volcanic rock type, Sn-Bi-Li-Th-As for invasive rock type, F-Th for metamorphic rock type, and Hg-Li-As-U for sedimentary rock type. According to the correlation analysis, the regression equation can be established between the geothermal water temperature T and the sediment element content in the water system sediments. It is indicated that the alkaline magmatic hydrothermal activities and the associated products of molybdenum and silver mineralization are heat-producing and thermal-conductive rock formations, whereas the metamorphic rocks and the sedimentary rocks constitute the insulation and heat preservation layers. According to the spatial distribution of the combination of geochemical anomalies of the indicator elements, a total of 50 geopotential or dry-hot rock prospect areas were delineated in bedrock areas of Jingjinji. These prospective areas show NE, NW and EW distributions, which are closely related to the deep huge faults and the Yanshanian medium-basic magmatic rocks. Meanwhile, they are consistent with the distributions of geothermal anomalies in the plain areas. In recent years, geothermal exploration activities show that this result has played an important guiding role.
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