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

• 来源期刊: 山地科学学报（英文版）
• 年，卷（期）: 2020,（3）
• 页码范围: 614-623
• 页数: 10页
• 语种: 英文

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 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.