Hydro-geochemistry evolution in Ordovician limestone water induced by mountainous coal mining: A case study from North China  

作　　者：HAO Chun-ming HUANG Yue MA Deng-jun FAN Xing 

机构地区：[1]North China Institute of Science and Technology,Sanhe 065201,China [2]State Key Laboratory ofWater 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

出　　处：《Journal of Mountain Science》2020年第3期614-623,共10页山地科学学报（英文）

基　　金：Key Laboratory of Water Resource Protection and Utilization in Coal Mining(Grant No.SHJT-17-42.17);Fundamental Research Funds for the Central Universities of China(Grant Nos.3142018009,3142017100);Key Laboratory of Mine Geological Hazards Mechanism and Control Project(KF2017-13).Figure 7 PCA plot of hydro-chemistry of Ordovician limestone karst(OL)water samples from different years.

摘　　要：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 hydrogeochemistry 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 Ca^2+, Mg^2+, SO4^2-,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 evaporationconcentration together. At last, evaporationconcentration co-effect dominated the hydrogeochemistry evolution slowly, along with significant cations exchange over years.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 hydrogeochemistry 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 evaporationconcentration together. At last, evaporationconcentration co-effect dominated the hydrogeochemistry evolution slowly, along with significant cations exchange over years.

关 键 词：Hydro-geochemistry EVOLUTION Rockwater interaction ORDOVICIAN limestone KARST water Coal mining activity 

分 类 号：P641.4[天文地球—地质矿产勘探]