摘要
The origin of the hyper saline groundwater in aquifers all over the world is still unclear till today. The current paper is an attempt to interpret a possible origin of the hyper salinity in the groundwater of the Wasia-Biyadh Aquifer system in Saudi Arabia. The result indicated that the major factors contributing salinity to groundwater are silicate weathering and evaporite dissolution/and or evaporation, as indicated by the Na<sup>+</sup>-normalized Ca<sup>2+</sup> VS HCO<span style="color:#333333;font-family:" font-size:16px;white-space:normal;background-color:#ffffff;"=""><sub>3</sub><sup><span style="color:#4F4F4F;font-size:10px;white-space:normal;">-</span></sup></span>plot. However, some groundwater samples showed hyper salinity that <span><span><span style="font-family:;" "="">had </span></span></span><span><span><span style="font-family:;" "="">been attributed to the presence of a naturally-occurring-hydrothermal system, due to the high concentration of the radionuclides within the aquifer. The high-salinity samples (Na</span></span></span><span><span><span style="font-family:;" "="">-</span></span></span><span><span><span style="font-family:;" "="">Cl type) plot under the evaporation line on the Na<sup>+</sup>/Cl<sup><span style="color:#4F4F4F;font-family:-apple-system, " font-size:16px;white-space:normal;background-color:#ffffff;"="">-</span></sup> vs. Cl<sup><span style="color:#4F4F4F;font-family:-apple-system, " font-size:16px;white-space:normal;background-color:#ffffff;"="">-</span></sup> relationship, suggesting deep heating that resulted in hyper salinity. The geochemical reactions in the eastern part of the aquifer included the precipitation of pyrite, dolomite, clay, and the incongruent dissolution of plagioclase.</span></span></span>
The origin of the hyper saline groundwater in aquifers all over the world is still unclear till today. The current paper is an attempt to interpret a possible origin of the hyper salinity in the groundwater of the Wasia-Biyadh Aquifer system in Saudi Arabia. The result indicated that the major factors contributing salinity to groundwater are silicate weathering and evaporite dissolution/and or evaporation, as indicated by the Na<sup>+</sup>-normalized Ca<sup>2+</sup> VS HCO<span style="color:#333333;font-family:" font-size:16px;white-space:normal;background-color:#ffffff;"=""><sub>3</sub><sup><span style="color:#4F4F4F;font-size:10px;white-space:normal;">-</span></sup></span>plot. However, some groundwater samples showed hyper salinity that <span><span><span style="font-family:;" "="">had </span></span></span><span><span><span style="font-family:;" "="">been attributed to the presence of a naturally-occurring-hydrothermal system, due to the high concentration of the radionuclides within the aquifer. The high-salinity samples (Na</span></span></span><span><span><span style="font-family:;" "="">-</span></span></span><span><span><span style="font-family:;" "="">Cl type) plot under the evaporation line on the Na<sup>+</sup>/Cl<sup><span style="color:#4F4F4F;font-family:-apple-system, " font-size:16px;white-space:normal;background-color:#ffffff;"="">-</span></sup> vs. Cl<sup><span style="color:#4F4F4F;font-family:-apple-system, " font-size:16px;white-space:normal;background-color:#ffffff;"="">-</span></sup> relationship, suggesting deep heating that resulted in hyper salinity. The geochemical reactions in the eastern part of the aquifer included the precipitation of pyrite, dolomite, clay, and the incongruent dissolution of plagioclase.</span></span></span>
作者
Muhammad Gomaah
Abdulaziz Al-Bassam
Muhammad Gomaah;Abdulaziz Al-Bassam(United Nations Developing Program (UNDP) & Ministry of Environment, Water & Agriculture, Riyadh, Saudi Arabia;National Center for Research and Water Studies, Ministry of Environment, Water & Agriculture, Riyadh, Saudi Arabia)
