黄土中宇宙成因核素^(10)Be示踪古地磁场变化研究进展

Progress of Tracing Paleo-geomagnetic Field from Cosmogenic Nuclide ^(10)Be in Loess of China

宇宙成因核素10Be示踪古地磁场的研究在海洋和冰芯研究中得到了广泛应用,然而受黄土来源及沉降过程的复杂性制约,运用中国黄土10Be示踪古地磁场变化的研究直到近年来才取得突破进展。综述了黄土10Be的研究现状并指出将其应用于地磁场示踪研究存在的关键问题,重点介绍了为分离黄土10Be浓度记录所包含的气候因素和地磁场影响因素而建立的LGM分离方法、剩磁矫顽力估算模型方法和"平均值概念"方法。各种创新数理方法的建立基本解决了黄土10Be示踪古地磁场的科学难题,使黄土10Be示踪古地磁场变化研究成为可能。

The study of the paleo-geomagnetic tracing using cosmogenic nuclide 10Be derived from the marine and ice core sediments has been widely applied. However, limited by the complexity of loess sources and the process of depositing, the investigation of 10 Be in Chinese loess lags behind until mathematical methods were estab- lished recent years. The research status of 10Be in Chinese loess is introduced. Three new methods for tracing pa- leo-geomagnetic field variability are focused ： The separation method of established Last Glacial Maximum, the rem- anence coercivity analysis model and the ＂mean value concept＂ method, which were established to separate climate effects from geomagnetic modulation effects on loess 10Be concentration. The establishment of mathematical methods have resolved the key problem of tracing paleo-geomagnetic field from 10Be in loess of China.