A study of Cl-36 age in Quaternary groundwater of Hebei plain, China

Chlorine-36 has various advantages as a dating tool for old groundwater. In this paper, Cl-36 of Quaternary groundwater in the Hebei plain of North Ch ina has been measured using accelerator mass spectrometry (AMS). Ages calcu lated from the Cl-36/Cl ratio show that ion filtration, which is responsibl e for the Cl- concentration increasing with depth and along flow paths in H ebei plain groundwater. It is concluded that Cl-33 age of the groundwater i n the 3rd Group of the Quaternary (Q(2)) in the Cangzhou area is 250ka, and that of the 4th Group(Q(1)) is 300ka.