Vol17 No.3: 614-623
【Title】Hydro-geochemistry evolution in Ordovician limestone water induced by mountainous coal mining: A case study from North China
【Author】HAO Chun-ming1,3#; HUANG Yue2*#; MA Deng-jun1; FAN Xing1
【Addresses】1 North China Institute of Science and Technology, Sanhe 065201, China; 2 State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 100077, China; 3 National Engineering Research Center of Coal Mine Water Hazard Controlling (Suzhou University), Suzhou 234000, China
【Corresponding author】HAO Chun-ming; HUANG Yue
【Citation】Hao CM, Huang Y, Ma DJ, Fan X (2020) Hydro-geochemistry evolution in Ordovician limestone water induced by mountainous coal mining: A case study from North China. Journal of Mountain Science 17(3). https://doi.org/10.1007/s11629-019-5485-9
【Abstract】This research aimed to investigate the changing mechanism of hydro-geochemistry in Ordovician limestone karst (OL) water induced by mountainous coal mining activities. Thus, the hydro-geochemistry evolution of OL water over 40 years within a typical northern mountainous coal mine named Fengfeng Mine was studied by using Piper diagram, Gibbs scheme, ions correlation and Principal component analysis (PCA ) methods. Results showed that, except for HCO3-, the ions of Ca2+, Mg2+, SO42-, Na++K+, Cl- and total dissolution solids (TDS) values all increased by years as mining continues. Different hydro-geochemical characteristics in different periods can reflect different water-rock interactions. Accordingly, sulfates dissolution gradually took place of carbonates in water-rock interaction. Especially, OL water-rock interactions in different periods were all affected by rock weathering and evaporation-concentration together. At last, evaporation-concentration co-effect dominated the hydro-geochemistry evolution slowly, along with significant cations exchange over years.
【Keywords】Hydro-geochemistry; Evolution; Rock-water interaction; Ordovician limestone karst water; Coal mining activity