阿尔及利亚核研究中心Moulla, Adnane Souffi小组报道阿尔及利亚东北部Mila盆地的地下水盐化和热流体污染。相关论文于2023年12月15日发表在《地球化学学报》杂志上。

研究数据表明，浅层岩溶含水层TDS增加了162mg L^-1，而用于饮用水供应的热碳酸盐含水层则增加了178mg L^-1。此外，在浅层含水层的地表记录到显著的温度变化，水是碳气态的。研究对溶解的主微量元素进行了分析，确定了影响化学组成的几个过程，即蒸发矿物的溶解作用、硫酸盐的还原作用、同质和不同质碳酸盐的溶解作用、去白云作用和硅酸盐的风化作用。

水文地球化学和地热测量结果表明，该区存在含盐热水与大气降水补给水的混合。已经确定了两个主要的地热田，一个是部分演化的水库，一个是流体与岩浆来源的硫酸(H₂S)相互作用的水库。这些以强烈热液蚀变为特征的热水确实通过断层和裂缝上升，并造成较浅含水层的污染。研究强调，了解水的地热测量和水文地球化学对于管理和保护Mila盆地地下水资源的质量至关重要，以确保该地区的可持续供水。研究已经建立了地下水循环与矿化获取的概念模型，进一步加强了对这方面的认识。

据悉，对Mila盆地地下水进行的定期水化学监测，为了解溶解盐的来源和控制水质盐化的水文地球化学过程提供了有价值的信息。

附：英文原文

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

Author: Bouroubi-Ouadfel, Yasmina, Moulla, Adnane Souffi, Khiari, Abdelkader

Issue&Volume: 2023-12-15

Abstract: 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 thermal 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 surface in the shallow aquifers and the waters are carbogaseous. 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 carbonates’ 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 geothermal fields have been identified, a partially evolved water reservoir and a water reservoir whose fluid interacts with sulphuric acid (H₂S) of magmatic origin. These hot waters that are characterized 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 understanding in this regard.

DOI: 10.1007/s11631-023-00662-2

Source: https://link.springer.com/article/10.1007/s11631-023-00662-2