The first Sm-Nd synchrone obtained in China with Sm-Nd methods is introduced and Sm-Nd isotopic geological dating in Early Archaean rocks in eastern Hebei has been determined.

• 适合低含量Sm,Nd的加压离子交换法。 同时介绍应用Sm-Nd法得出的我国第一条Sm-Nd等时线,测出了冀东早太古代岩石Sm-Nd同位素地质年龄。