Brunhes极性期以来地球磁场相对强度变化研究

The Progress of Relative Paleointensity of the Geomagnetic Field over the Brunhes Epoch

从沉积物中提取连续、高分辨的地球磁场相对强度记录 ,是地磁学研究的热点问题之一。它不仅对探索地球内部动力学过程具有重要意义 ,而且也是校正一些宇宙成因核素输入量的参考标准。近几年来 ,“相对强度地层学”或“相对强度年代学”的概念逐渐兴起 ,地球磁场相对强度在全球对比方面的意义日益受到重视 ,尤其是对缺乏氧同位素年代学控制的沉积物。在介绍相对强度研究方法的基础上 ,主要较系统的回顾了Brunhes极性期以来相对强度研究的一些概况。

One of the key tasks in geomagnetic field study is to obtain the relat ive paleointensity records from continuous and well-dated sediments . Its meaning is not only on exploring the behavior of the earths magnetic fi eld in the past and dynamics of the inner-earth, but also on calibrating some c osmogenic radionuclide production rate such as { 10Be, 14C.} In recent years, the concept of 'Relative paleointensity chronostratigraphy' is gr adually springing up, and the application of relative intensity as a new global correlating tool attracts much attention. The study methods of relative intensit y and some progress in this field over the Brunhes epoch were reviewed.