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首页> 外文期刊>Environmental earth sciences >Isotope-geochemical assessment of thermal waters and their impact on surrounding potable water resources in the Tapi valley geothermal area, Maharashtra, India
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Isotope-geochemical assessment of thermal waters and their impact on surrounding potable water resources in the Tapi valley geothermal area, Maharashtra, India

机译：热水的同位素 - 地球化学评估及其对印度马哈拉施特拉州地热区周围饮用水资源的影响及其影响

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摘要

Geochemical and isotopic investigations were carried out in the Tapi Valley geothermal area in India to determine the principal factors that are responsible for the geochemical evolution of the thermal and non-thermal waters in the study area. The impact of thermal water discharges on the surrounding potable water resources had also been assessed. It was found that thermal water did not contain any toxic elements (mercury, antimony, arsenic) which are detrimental to human consumption. Thermal waters were found to be less mineralized compared to the non-thermal ground waters. The water types of the thermal and non-thermal waters were found to be mostly Na-Cl-HCO3 and Ca-Mg-HCO3, respectively. Silicate weathering and ion-exchange processes were found to be main factors that determined the dissolved solute concentration in the study area. Stable isotopic (delta O-18, delta H-2) analysis unequivocally established the meteoric origin of the thermal waters. Thermal waters in Unapdeo, Anekdev, Kundwa and Ratanpura were found to have distinct isotopic compositions signifying that separate reservoirs were feeding these hot springs. The application of chemical geothermometers showed a wide variation in the estimation of reservoir temperature. The quartz geothermometer produced the most reliable reservoir temperature estimate of 110 +/- 12 degrees C. Multicomponent geothermometry was found to better constrain the reservoir temperature. This modelling result indicated that the thermal water in this region had attained simultaneous equilibrium with respect to quartz, aragonite, stilbite, calcite, enstatite, heulandite, diopside minerals in the temperature range of 120 +/- 5 degrees C which could be taken as the subsurface reservoir temperature.
机译：在印度的Tapi Valley地热区域进行了地球化学和同位素调查，以确定负责研究区域中热水和非热水的地球化学演变的主要因素。还评估了热排水对周围饮用水资源的影响。结果发现，热水不含任何对人食用不利的有毒元素（汞，锑，砷）。与非热地水相比，发现热水不太矿化。发现热和非热水水的水分分别是Na-Cl-HCO3和Ca-Mg-HCO3。发现硅酸盐风化和离子交换过程是确定研究区域中溶解溶质浓度的主要因素。稳定同位素（Delta O-18，Delta H-2）分析明确地建立了热水的陨石来源。发现unapdeo，Anekdev，Kundwa和ratanpura的热水有明显的同位素组合物，表示单独的水库喂养这些温泉。化学地水测定仪的应用在储层温度估计中显示出广泛的变化。石英地热计生产了110 +/- 12摄氏度的最可靠的储层温度估计。发现多组分地热测定法以更好地限制储层温度。这种造型结果表明，该区域的热水相对于石英，金属石，斯蒂尔巴，方解石，山牙石，海螺矿，偶极侧矿物的热水在120 +/- 5摄氏度的温度范围内实现了可采用的地下水库温度。

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