Han, J.; Huang, C.; Chang, L.; Hou, P.; Wang, Y.; Zou, J.; Ren, C. Genetic Mechanism of Geothermal Water in Huichang Fault Depression Basin, Southern Jiangxi Province, China: Based on Hydrochemical Characteristics. Preprints2024, 2024050268. https://doi.org/10.20944/preprints202405.0268.v1
APA Style
Han, J., Huang, C., Chang, L., Hou, P., Wang, Y., Zou, J., & Ren, C. (2024). Genetic Mechanism of Geothermal Water in Huichang Fault Depression Basin, Southern Jiangxi Province, China: Based on Hydrochemical Characteristics. Preprints. https://doi.org/10.20944/preprints202405.0268.v1
Chicago/Turabian Style
Han, J., Jin Zou and Chonghe Ren. 2024 "Genetic Mechanism of Geothermal Water in Huichang Fault Depression Basin, Southern Jiangxi Province, China: Based on Hydrochemical Characteristics" Preprints. https://doi.org/10.20944/preprints202405.0268.v1
Abstract
The Huichang fault Basin in Jiangxi Province exhibits high terrestrial heat flow values and a dense concentration of hot springs. However, existing research is limited to individual geothermal fields without a comprehensive basin-wide analysis of geothermal water origins. This study investigates the source of geothermal water across five representative geothermal fields using hydrochemical components and isotopic analyses. The findings indicate: (1) The hydrochemical type transitions from bicarbonate sulphate-sodium-calcium in the north to bicarbonate sodium-calcium in the south; (2) Major chemical components of the geothermal water derive from evaporative salt rocks (Cretaceous sand conglomerate cover) and siliceous formations (granite/metamorphic rock basement); (3) The recharge elevation for geothermal water is approximately 1 km, sourced from adjacent hills. The central basin's geothermal water has an apparent age of about 26,000 years, with δ¹³C indicating participation in deep circulation; (4) Thermal reservoir temperatures range from 74 to 113℃, with the lowest temperatures at the basin's edges (Anzishan and Shangjin geothermal fields) and higher temperatures towards the center, suggesting increased warming and a circulation depth of 1.5 to 2.5 km; (5) Simulation results of reverse water-rock interaction indicate that mineral precipitation-dissolution processes are governed by the basin's main thermal control structures. The geothermal fields are predominantly influenced by reduction alterations associated with granite and are closely linked to paleo-geothermal waters in the enclosed basin, with the formation of these fields heavily reliant on the heat production or conduction from radioactive elements in granite.
Environmental and Earth Sciences, Geophysics and Geology
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