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Hydrochemical characteristics and controlling factors of geothermal fluids during wet period in south-eastern Gansu seismic belt, China |
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| รหัสดีโอไอ | |
| Creator | Lei Gao |
| Title | Hydrochemical characteristics and controlling factors of geothermal fluids during wet period in south-eastern Gansu seismic belt, China |
| Contributor | Hanheng He, Rengui Yang, Chun Liu, Xianglong Yin |
| Publisher | Maejo University |
| Publication Year | 2569 |
| Journal Title | Maejo International Journal of Science and Technology |
| Journal Vol. | 20 |
| Journal No. | 1 |
| Page no. | 124 |
| Keyword | hot springs, south-eastern Gansu seismic belt, China, seismic zone, hydrochemical type |
| Website title | Maejo International Journal of Science and Technology |
| ISSN | 1905-7873 |
| Abstract | Based on hydrogen and oxygen isotopes and hydrochemical composition data, this paper discusses the sources, genesis and geochemical changes of geothermal fluids in the south-eastern Gansu province.Water from six hot springs (Tongwei bathing pool River Hot Spring, Qingshui seismostation, Tianshui seismostation, Wushan seismostation, Chengxian seismostation and Wudu seismostation) was collected in triplicate from July to September in the wet season. The measurement results showed that total dissolved solids of the water samples ranged from 456-2823 mg/L.The water samples can be classified into four hydrochemical types: Na+-Cl-, Ca2+/Na+-HCO3-, Ca2+-SO42-and Na+-HCO3-. The hydrogen and oxygen isotopic composition indicates that the hot spring water in the region originates from atmospheric precipitation, undergoes water-rock interactions during its circulation, and may mix with surface water. The chemical composition of the water across different water bodies is primarily influenced by water-rock interactions and evaporation-crystallisation processes. Using the Gaillardet model, it is concluded that most ions result from the combined weathering and dissolution of silicate and evaporite rocks. The depth of hot water circulation exceeds 3 km, and significant changes in circulation depth have occurred since the Wenchuan earthquake. |
