Mining activities interfere into the natural groundwater chemical environment, which may lead to hydrogeochemical changes of aquifers and mine water inrush disasters. The study of hydrogeochemical evolution processes of underground aquifers is helpful to the prevention and control of mine water inrush. The results show that the study area is mainly impacted by four hydrogeochemical processes: dissolution, cation exchange, desulfurization and reduction, and pyrite oxidation. The Cenozoic aquifers are dominated by carbonate dissolution and desulfurization. The Permian aquifers are impacted mainly by cation exchange and sulfate dissolution, followed by pyrite oxidation. The Carboniferous aquifers are mainly impacted by dissolving sulfate, followed by pyrite oxidation and cation exchange. The hydrogeochemical evolution of the aquifers was controlled by mining activities and tectonic changes, and a certain regularity in space. For the Cenozoic aquifers, sulfate dissolution and cation exchange increase from west to east, and desulfurization weakens. For the Permian aquifers, cation exchange and sulfate dissolution are stronger near synclines and faults, pyrite oxidation is enhanced, and desulfurization decreases from the middle to the east of the mining area. For the Carboniferous aquifers, there is a higher dissolution of rock salt, pyrite oxidation, and cation exchange from west to east, and the desulfurization effect weakens.

中文翻译：

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煤矿区地下多含水层系统水文地球化学演化及控制机制

采矿活动干扰地下水天然化学环境，可能导致含水层水文地球化学变化和矿井突水灾害。地下含水层水文地球化学演化过程的研究有助于矿井突水防治。结果表明，研究区主要受溶解、阳离子交换、脱硫还原、黄铁矿氧化4个水文地球化学过程的影响。新生代含水层以碳酸盐溶解和脱硫作用为主。二叠纪含水层主要受阳离子交换和硫酸盐溶解的影响，其次是黄铁矿氧化。石炭系含水层主要受硫酸盐溶解影响，其次是黄铁矿氧化和阳离子交换。含水层的水文地球化学演化受采矿活动和构造变化的控制，具有一定的空间规律。对于新生代含水层，硫酸盐溶解和阳离子交换自西向东增加，脱硫作用减弱。二叠系含水层在向斜和断层附近阳离子交换和硫酸盐溶蚀作用较强，黄铁矿氧化作用增强，脱硫作用从矿区中部向东部减弱。石炭系含水层自西向东岩盐溶解、黄铁矿氧化、阳离子交换作用较大，脱硫作用减弱。二叠系含水层在向斜和断层附近阳离子交换和硫酸盐溶蚀作用较强，黄铁矿氧化作用增强，脱硫作用从矿区中部向东部减弱。石炭系含水层自西向东岩盐溶解、黄铁矿氧化、阳离子交换作用较大，脱硫作用减弱。二叠系含水层在向斜和断层附近阳离子交换和硫酸盐溶蚀作用较强，黄铁矿氧化作用增强，脱硫作用从矿区中部向东部减弱。石炭系含水层自西向东岩盐溶解、黄铁矿氧化、阳离子交换作用较大，脱硫作用减弱。