Hydrogeochemical process and coal mining-motivated effect on the hydrochemistry for the groundwater system in mining area of Western China

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Yifan Zeng , Qiang Wu , Aoshuang Mei , Lu Wang , Wenbin Yin , Lei Yang , Di Zhao , Shihao Meng , Hongfei Gao
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Abstract

The Jurassic coalfield in the mining area of western China exhibits a multi-layered groundwater system. However, it is subject to an arid and semi-arid climate with limited water resources. Consequently, the ecological environment is highly vulnerable, and the chemistry and quality of groundwater may be influenced by multiple factors. This study systematically the coal mining-motivated effect on the hydrochemistry and water quality of the groundwater system, using the Caojiatan Coal Mine as a case study. The analysis incorporates a combination of the self-organizing maps (SOM), entropy-weighted water quality index (EWQI), and traditional hydrochemical analysis methods. After coal mining, there was an increase in the proportion of HCO3-Ca and HCO3-Mg in the groundwater samples of J2z, J2y4, and J2y5. The groundwater is controlled by cation exchange as a whole. The J2y4 and above groundwater is influenced by both the dissolution of carbonate and silicate rocks before coal mining. After coal mining, the Quaternary and J2a groundwater in the western wing is primarily influenced by the dissolution of carbonate rocks; the J2z, J2y4 and J2y5 groundwater is primarily governed by the dissolution of silicate rocks and the oxidation of FeS2; the J2y3 and below groundwater is primarily controlled by the dissolution of evaporate rocks. The resulting dilution effect after coal mining and the implementation of measures for the discharge of treated mine water make the groundwater quality of the J2y4 and higher aquifers tend to be better. The research findings serve as a valuable reference for promoting the sustainable development and protection of groundwater resources not only in the study area but also in other coal mines.

中国西部矿区地下水系统的水文地质化学过程及煤矿开采对水文化学的影响
中国西部矿区的侏罗纪煤田呈现多层地下水系统。然而,这里气候干旱半干旱,水资源有限。因此,生态环境非常脆弱,地下水的化学成分和水质可能受到多种因素的影响。本研究以曹家滩煤矿为例,系统分析了煤矿开采对地下水系统水化学和水质的影响。分析结合了自组织图(SOM)、熵权水质指数(EWQI)和传统的水化学分析方法。采煤后,J2z、J2y4 和 J2y5 地下水样本中 HCO3-Ca 和 HCO3-Mg 的比例有所增加。地下水整体受阳离子交换控制。J2y4 及以上地下水受采煤前碳酸盐岩和硅酸盐岩溶解的影响。采煤后,西翼第四系和 J2a 地下水主要受碳酸盐岩溶解的影响;J2z、J2y4 和 J2y5 地下水主要受硅酸盐岩溶解和 FeS2 氧化的影响;J2y3 及以下地下水主要受蒸发岩溶解的控制。煤炭开采后产生的稀释作用和矿井水处理后排放措施的实施,使 J2y4 及以上含水层的地下水水质趋于好转。这些研究成果不仅对促进研究区地下水资源的可持续发展和保护,而且对其他煤矿的地下水资源的可持续发展和保护都具有重要的参考价值。
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来源期刊
Journal of Geochemical Exploration
Journal of Geochemical Exploration 地学-地球化学与地球物理
CiteScore
7.40
自引率
7.70%
发文量
148
审稿时长
8.1 months
期刊介绍: Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.
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