Hydrochemical Characteristics and Genetic Analysis of Carboniferous Taiyuan Formation Limestone of Zouzhuang Coal Mine in Huaibei Coalfield
With the gradual exhaustion of shallow coal resources,the coal mining of Zouzhuang Coal Mine in Huaibei Coalfield is gradually developing to the deep,and the original balance of the deep groundwater system is destroyed.The aquifer of Carboniferous Taiyuan formation limestone is located under the mining coal seam and is strongly in-fluenced by mining.It also has different degrees of hydraulic connection with the underlying Ordovician karst groundwater.In order to ensure safe mining and ensure the rapid identification of water inrush sources after mine water inrush occurs,it is necessary to systematically study the hydrogeochemical characteristics of aquifer of Carbon-iferous Taiyuan formation limestone.Therefore,this paper takes the aquifer of Carboniferous Taiyuan formation lime-stone of Zouzhuang Coal Mine in Huaibei Coalfield as the research object,and uses mathematical statistics,Piper three-line diagram,Gibbs diagram,ion proportional coefficient,principal component analysis and other methods to discuss the hydrogeochemical formation process of the aquifer in the deep.The results showed that:The aquifer of Carboniferous Taiyuan formation limestone is weakly alkaline,and TDS ranges from 1 520 mg/L to 1 674 mg/L,be-longing to brackish water.Its water chemical type is Na-HCO3-Cl type;Gibbs diagram analysis showed that the for-mation of the aquifer is mainly affected by rock weathering;Ion proportional coefficient and principal component a-nalysis showed that the main source of ions aquifer was mainly controlled by leaching and dissolution.It is mainly based on the dissolution of calcite,and also includes a small amount of salt dissolution,gypsum dissolution and sul-fide oxidation dissolution.In the process of runoff of the aquifer,the alternating adsorption of cations with the sur-rounding rock occurs.The type is Ca2+in aquifer exchanging Na+in rocks.
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