Multiple runoff connections for groundwater supply and water quality evolution mechanisms were disclosed using hydrochemistry, multivariate statistics, stable hydrogen and oxygen isotopes, and inverse hydrogeochemical modeling in a multi-layer groundwater system in a north China coal-mining district. Groundwater quality was mainly influenced by dissolution and weathering of carbonate, silicate, gypsum, halite, and fluorite, as well as cation exchange. Sulfate enrichment in the Carboniferous limestone aquifer may be due to pyrite oxidation, while gypsum dissolution and sewage contribute sulfate to the Quaternary alluvium. The Ordovician limestone groundwater is hydraulically connected to the other two aquifers. Incongruent dissolution of dolomite occurs when the Ordovician limestone water contacts the Carboniferous aquifer, while evaporation occurs when the Ordovician limestone water migrates upward through fractures to the Quaternary aquifer.

中文翻译：

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某煤矿区地下水水文地球化学机制及多层含水层的连通性

使用水化学、多元统计、稳定的氢和氧同位素以及逆水文地球化学模型，在华北某煤矿区的多层地下水系统中揭示了地下水供应和水质演变机制的多个径流联系。地下水水质主要受碳酸盐、硅酸盐、石膏、岩盐、萤石的溶解风化和阳离子交换的影响。石炭纪石灰岩含水层中硫酸盐富集可能是由于黄铁矿氧化，而石膏溶解和污水为第四纪冲积层提供硫酸盐。奥陶纪石灰岩地下水通过液压与其他两个含水层相连。当奥陶系石灰岩水接触石炭系含水层时，发生白云石的不一致溶解，