[Objective]Boron is a relatively conservative element in geothermal fluids that often accompanies geo-thermal systems,and its origin plays an important role in revealing the genesis mechanisms of different types of geo-thermal systems.[Methods]In this study,the geothermal systems of the Daggyai in Tibet and the Yinchuan Basin in Ningxia were selected for investigating the source of boron in geothermal water and its related geochemical processes in different types of geothermal systems.These study areas are typical of high-temperature and medium-low-temperature geothermal systems in China,and both have extremely high boron concentrations.[Results]Re-sults showed that the boron in the neutral/weakly alkaline geothermal water of the Daggyai was primarily contributed by dissolution filtration of the surrounding rocks and magmatic fluid input,while the boron in the acidic geothermal water was primarily contributed by the input of shallow cold water from the subsurface.Boron in the geothermal wa-ter of Yinchuan primarily originated from the recharge of deep paleosedimentary water.On this basis,the genetic mechanisms of different types of geothermal systems were discussed by combining the regional geological background and the hydrochemical characteristics of geothermal water.[Conclusion]This study suggests that the geochemical characteristics of boron in geothermal water have the potential to identify the genesis mechanisms of different types of geothermal systems.
关键词
硼/地热系统/地热水/成因机制/岩浆热源/古沉积水
Key words
boron/geothermal systems/geothermal water/genetic mechanism/magmatic heat source/paleosedi-mentary water
维普
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