Long-term hydrochemical monitoring and geothermometry:understanding groundwater salinization and thermal fluid contamination in Mila’s basin,Northeastern Algeria  

作　　者：Yasmina Bouroubi-Ouadfel Adnane Souffi Moulla Abdelkader Khiari 

机构地区：[1]Natural Resources and Management of Sensitive Environments Lab,Geology Department,Oum El Bouaghi University,04000 Oum El Bouaghi,Algeria [2]Dating and Isotope Tracing Department,Algiers Nuclear Research Centre,16000 Algiers,Algeria

出　　处：《Acta Geochimica》2024年第3期459-477,共19页地球化学学报（英文）

摘　　要：The regular hydrochemical monitoring of groundwater in the Mila basin over an extended period has provided valuable insights into the origin of dissolved salts and the hydrogeochemical processes controlling water salinization.The data reveals that the shallow Karst aquifer shows an increase in TDS of 162 mg L^(-1) while the ther-mal carbonate aquifer that is also used for drinking water supply exhibits an increase of 178 mg L^(-1).Additionally,significant temperature variations are recorded at the sur-face in the shallow aquifers and the waters are carbo-gaseous.Analysis of dissolved major and minor elements has identified several processes influencing the chemical composition namely:dissolution of evaporitic minerals,reduction of sulphates,congruent and incongruent car-bonates’dissolution,dedolomitization and silicates’weathering.The hydrogeochemical and geothermometric results show a mixing of saline thermal water with recharge water of meteoric origin.Two main geothermalfields have been identified,a partially evolved water reservoir and a water reservoir whosefluid interacts with sulphuric acid(H_(2)S)of magmatic origin.These hot waters that are char-acterized by a strong hydrothermal alteration do ascend through faults and fractures and contribute to the contamination of shallower aquifers.Understanding the geothermometry and the hydrogeochemistry of waters is crucial for managing and protecting the quality of groundwater resources in the Mila basin,in order to ensure sustainable water supply for the region.A conceptual model for groundwater circulation and mineralization acquisition has been established to further enhance under-standing in this regard.

关 键 词：Hydrochemical monitoring HYDROGEOCHEMISTRY SALINIZATION Geothermal reservoir CONTAMINATION Mila’s basin 

分 类 号：P641[天文地球—地质矿产勘探] P314[天文地球—地质学]