一、概史 古地磁年代学发展成为一门新的学科,经历了几十年的过程。十九世纪M.Melloni(1853)对意大利火山岩的天然剩余磁化强变的测量发现,它们的磁化方向大致平行地磁场方向,实验的结果证实了火山岩的剩磁是在岩流冷却时由地场磁化而获得的。但是古地磁研究中一个极其重大的成果是发现了反向磁化岩石的存存。1906年,B.Brunhes对法国熔岩和其下伏的烘烤粘土的剩磁测量结果发现,它们的方向与 First, the history of paleomagnetic geochronology has developed into a new discipline, after decades of process. In the nineteenth century, M. Melloni (1853) measured the natural residual magnetization changes of volcanic rocks in Italy and found that their directions of magnetization are approximately parallel to the direction of the magnetic field. The experimental results confirm that the remanence of volcanic rocks is determined by the field Obtained by magnetization. However, one of the most significant achievements of paleomagnetic research is the discovery of the storage of reverse magnetized rocks. In 1906, B. Brunhes’s remanence measurements of French lava and its underlying baked clay showed that their orientation was