| Autor: |
Xumei Mao, Yanxin Wang, Hongbin Zhan, Liang Feng |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Journal of Geochemical Exploration. 158:112-121 |
| ISSN: |
0375-6742 |
| Popis: |
Chemical and isotopic compositions of thermal springs and non-thermal springs and well from Dongguan Basian of Southern China were measured and used to assess the mechanism of hydrothermal system hosted by deep-seated faults. Thermal springs had relatively higher temperatures and dissolved ion contents than non-thermal springs and wells, and were classified as water chemistry type of HCO 3 -Na + K. The reservoir temperatures were determined with their chemical compositions, and 131.0 to 138.9 °C estimated by a quartz geothermometer after steam loss were regarded as the most suitable assessment. Inadequate equilibrium between water and rock interaction is mostly speculated and the mixing with shallow non-thermal groundwater probably has minor contribution to the thermal springs. Stable isotope compositions of thermal springs ranged from − 45.1‰ to − 40.8‰ for δD and from − 7.2‰ to − 6.9‰ for δ 18 O, respectively. These isotopic results were almost identical to those of non-thermal springs. All the thermal and non-thermal groundwater samples scattered around the meteoric water lines, thus indicating meteoric water origin without further influences of evaporation and groundwater–rock interaction. The similarity of thermal and non-thermal groundwater in chemical and isotopic compositions suggested that groundwater migrating and being heated very quickly in a relatively fast conductive fracture system hosted by deep-seated faults mostly represented the mechanism of thermal springs. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect