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Dubravsky Massif菱镁矿体的开采产生了部分局限在石炭纪低裂缝渗透变质岩中的喀斯特型裂缝含水层。大量的开矿过程对含水层中的地下水循环和化学成分都造成了可观的变化。本文研究了在这种复杂条件下地下水化学成分变化成因模型。根据化学配位模型,计算出所选矿物的饱和指数,从而指示所有喀斯特裂缝含水层饱和带中的地下水对菱镁矿、白云石、方解石的过饱和度和石膏的不饱和度。假设地下水未受人类活动的污染,而白云石中黄铁矿的氧化对成矿影响甚微,则水化学数据的统计描述代表了含水层中的水文地球化学背景。矿山中矿石焙烧释放的富氮气体凝聚产生的醋酸,能促进菱镁矿和白云石的溶解。这样产生的地下水相对背景值来说则富集NO3,Mg,和TIC。因此,由于地下开矿,岩溶作用估计将是原来的1.5倍。尽管有污染,这些所测参数并没有超过斯洛伐克卫生保健部颁发的No.29／2002 Z.z.饮用水标准临界值。因此采矿后含水层的开采也是可行的。
The mining of the Dubravsky Massif magnesite ore body resulted in a karst-type fracture aquifer partially confined to the low Carboniferous infiltration metamorphic rocks. Massive mining processes have caused considerable changes in groundwater circulation and chemical composition in aquifers. This paper studies the genetic model of groundwater chemical composition under such complicated conditions. Based on the chemical coordination model, the saturation index of the selected minerals is calculated to indicate the subsurface saturation of groundwater to magnesite, dolomite, calcite and the gypsum unsaturation in all karst fracture aquifers. Assuming that groundwater is not contaminated by human activities and that the oxidation of pyrite in dolomite has little effect on mineralization, the statistical description of the hydrochemical data represents the hydrogeochemical background in the aquifer. Acetic acid produced by the condensation of nitrogen-rich gas released by ore roasting in mines can promote the dissolution of magnesite and dolomite. The resulting groundwater is enriched in NO3, Mg, and TIC relative to background. Therefore, due to underground mining, karstification is estimated to be 1.5 times the original. Despite the contamination, these measured parameters do not exceed the No.29 / 2002 Z.z. Drinking Water Criteria threshold issued by the Slovak Ministry of Health. As a result, mining of aquifers after mining is also feasible.