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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Mixing hydrology and chemical equilibria in Bakreswar geothermal area, Eastern India
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Mixing hydrology and chemical equilibria in Bakreswar geothermal area, Eastern India

机译：印度东部Bakreswar地热区的混合水文和化学平衡

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摘要

A group of alkaline thermal springs of Bakreswar, having varying temperatures (45-71 ℃) and identical compositions emerges through a nearly N-S trending fault in the gneissic basement. The thermal springs are of Na-Cl-SO_4 type and are rich in SiO_2 and F, contrary to the local groundwaters which are mostly of Ca-HCO_3 type. The springs undergo mild to moderate dilution by local groundwater, which does not significantly affect their original compositions. Agnikund, the main spring, with the highest temperature, mild dilution, consistent composition and negligible tritium, discharges almost pure deep-seated thermal water. Original thermal water is at equilibrium with quartz in the deep reservoir and, attains surface temperature largely by conductive cooling with no significant loss of dissolved SiO_2. Certain ionic ratios coupled with very low tritium contents in the springs are indicative of prolonged subsurface circulation of the original water. XRD results of the spring site sediments and the bore hole rocks fairly corroborate the predicted saturation state of thermal water with respect to quartz, feldspar, calcite, fluorite etc., which is believed to control the major chemical compositions of the springs. A geothermal reservoir having probable temperature of about 100 ± 5 ℃ and possibly occurring at a depth of 1 km is the source of thermal water for the springs. The present study is aimed at understanding the mixing trend between thermal springs and local groundwaters as well as the water-rock equilibria.
机译：Bakreswar的一组碱性温泉具有不同的温度（45-71℃），并且通过片麻岩基底中的近N-S趋势断层出现了相同的成分。温泉水为Na-Cl-SO_4型，富含SiO_2和F，这与当地的地下水大多数为Ca-HCO_3型相反。泉水受到当地地下水的轻度至中度稀释，这不会显着影响其原始成分。 Agnikund是主泉，温度最高，稀释度适中，成分一致且tri含量可忽略不计，几乎排出了纯净的深层热水。原始热水与深层储层中的石英处于平衡状态，并通过传导冷却在很大程度上达到表面温度，而溶解的SiO_2却没有明显损失。弹簧中某些离子比率加上极低的tri含量表明原水的地下循环时间延长。弹簧部位沉积物和钻孔岩石的XRD结果相当证实了相对于石英，长石，方解石，萤石等预测的热水的饱和状态，据信它们可以控制弹簧的主要化学成分。地热水可能是大约100±5℃的温度，并且可能出现在1 km的深度处，它是温泉的热水来源。本研究旨在了解温泉与当地地下水之间的混合趋势以及水岩平衡。

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