Recharge of groundwater in the Xiaoshan area of Cangzhou

A study of hydrogeochemistry and stable isotopes has been carried out for 9 pumping wells in the Xiaoshan area located in the east of Cangzhou.Isotopic data of oxygen and hydrogen show that the shallow groundwater received recharge in the Holocene Period and groundwater in the deep aquifer obtained recharge in the glacial period of the Late Pleistocene.Their different recharge environment is also explained by Br~-/Cl~-ratios: the shallow coming from modern coast environment and the deep from inland conditions.The variations in F~-and I~-contents suggest that the recharge sources in the shallow groundwater are input from precipitation and F~-and I~-come individually from mineral dissolution and organic degradation in the deep palaeogroundwater due to a long residence time.