LI Zhengkui, DONG Shaogang, LIU Xiaobo, WANG Chao, ZHOU Yuze

（College of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China)

Abstract: Multiple methods, including mathematical statistics, correlation matrices, Piper diagram, Gibbs mode and ionic ratios, were employed to analyze hydrochemical characteristics and formation mechanisms of the shadow groundwater in the Luoyang Basin on the basis of a systematic collection of water samples. The results show that HCO3- and Ca2+ are the predominant anion and cation of shallow groundwater. The main hydrochemistry types of groundwater are HCO3-Ca and HCO3-Ca？Mg types. The concentration of total dissolved solids (TDS) and total hardness are relatively low in shallow groundwater, with averages of 450.5 mg/L and 329.3 mg/L, respectively. The chemical characteristics of shallow groundwater is mainly derived from the rock weathering. The main constituents of groundwater come from long-term weathering and dissolution of minerals such as carbonates and silicates. In addition, the reverse cation exchange also affects the formation process of shallow groundwater in a certain extent.

Key words: groundwater; hydrogeochemistry; evolution feature; Luoyang Basin

EARTH AND ENVIRONMENT Vol.47, No.1, Tot No.327, 2019, Page 57-63