The hydrogen and oxygen isotopic analysis of geothermal water in Guihu

摘要

Geothermal resources are abundantly available, low-cost, renewable, and clean. Therefore, the exploitation and utilization of geothermal resources would exert a great influence on society and economy. Fuzhou geothermal, which is on behalf of the medium and low temperature magmatite rock fissure type geothermal, is often with surface thermal manifestations and distributes zonally along the tectonic fissures. Aiming to investigate the origin of the Fuzhou geothermal field, this paper takes Fuzhou Guihu geothermal field as the research object, analyzing its geothermal background of regional tectonic characteristics. Special analyses of the geothermal water chemical and isotopic characteristics (including the formation and origin mode of ground water constants and trace elements, D/~(18)O isotopes) revealed that the underground hot water of Guihu was originated from precipitation and formed by the heating effect of the deep geothermal circulation. Based on isotopic fractionation, the calculated precipitation infiltration recharge elevation for the Guihu geothermal water is 536.3m. In the light of the surrounding topography, it is reasonably inferred that the Jialiang Mountain is the recharge source of the Guihu geothermal water.