一、前言近十年来放射性地质年代学的研究在许多国家发展得很快,这门学科在解决地质科学中某些理论问题,愈来愈显示出它的重要意义。在我国郭承基首先注意这项工作,他在1954年前后曾试用化学铅法得出华北某些伟晶岩中的矿物年龄。从1956年起在我国的 I. Introduction The study of radiogenic geochronology in recent ten years has developed rapidly in many countries. This discipline has increasingly shown its significance in solving some theoretical problems in geosciences. Guo Chengji first paid attention to this work in our country. Before 1954, he experimented with the chemical lead method to get the mineral age of some pegmatites in North China. Since 1956 in our country