Chemical composition of underground brine in shore along Laizhou Bay

The chemical composition of underground brine samples in the coast area of Laizhou Bay was analyzed.The results suggest that the underground brines in this area originated from seawater.However,some differences were found among them.There were obvious water-rock interactions between underground brines and surrounding rock after the formation of brines.K+ is the most affected ion by water-rock interaction.Therefore,the exchange of K+ between seawater and clay is the important transport form of K+ from the seawater.